A current of 5. 00 a is passed through a ni(no3)2 solution. How long, in hours, would this current have to be applied to plate out 7. 70 g of nickel?

Answers

Answer 1

The time it would take to plate out 7.70 g of nickel using a [tex]Ni(NO_3)_2[/tex] solution would depend on the rate at which the solution is being applied and the rate at which the nickel is being plated out.

To plate out 7.70 g of nickel using a  [tex]Ni(NO_3)_2[/tex]  solution, we can use the following equation:

[tex]Ni(NO_3)_2[/tex]  + [tex]H_2O[/tex] → [tex]Ni(OH)_2[/tex]+ [tex]NO_3[/tex]^-

here Ni(OH)2 is nickel hydroxide and   [tex]NO_3[/tex]^- is nitrate ion.

The amount of  [tex]NO_3[/tex]^-  formed can be calculated using the stoichiometry of the reaction:

2 [tex]Ni(NO_3)_2[/tex] + 4 [tex]H_2O[/tex]  → 2  [tex]Ni(OH)_2[/tex] + 4 [tex]NO_3[/tex]^-

We can then use the molar mass of  [tex]Ni(OH)_2[/tex] to calculate the mass of Ni(OH)2 formed per unit volume of solution:

mass of  [tex]Ni(OH)_2[/tex]/unit volume = moles of  [tex]Ni(OH)_2[/tex]/moles of reaction product x molar mass of  [tex]Ni(OH)_2[/tex]

Once we have the mass of  [tex]Ni(OH)_2[/tex] formed per unit volume, we can use the volume of the  [tex]Ni(OH)_2[/tex] solution to calculate the amount of time it would take to plate out a certain mass of nickel.

Therefore, the time it would take to plate out 7.70 g of nickel using a  [tex]Ni(NO_3)_2[/tex]  solution would depend on the rate at which the solution is being applied and the rate at which the nickel is being plated out.  

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Related Questions

MARKING BRAINLIEST! Please help asap, i need both questions, use ICE box method, thank u

Answers

To calculate the pH from pOH, you can use the formula:

pH + pOH = 14

In this case, we need to calculate the pH from the given pOH value.

Given: pOH = 2.8

Step 1: Calculate the pH using the formula pH = 14 - pOH

pH = 14 - 2.8
pH = 11.2

Therefore, the pH of the solution with a pOH of 2.8 is 11.2.

What would be the most appropriate choice of indicator for a titration of a diprotic acid with equivalence points at ph 1. 8 and 7. 7?

Answers

For titration of a diprotic acid with two equivalence points at pH 1.8 and 7.7, the most appropriate choice of indicator would be a mixture of two indicators that have pH ranges such as a combination of methyl orange and bromothymol blue.

What are indicators?

An indicator is any substance that provides a clear indication, typically through a color change, of the presence or absence of a threshold concentration of a chemical species, like an acid or an alkali in a solution. To give an alkaline solution a yellow hue, for instance, methyl yellow is used.

Considering the given titration, a mixture of methyl orange and bromothymol blue will be suitable because methyl orange has a pH range of 3.1 to 4.4 and Bromothymol blue has a pH range of 6.0 to 7.6.

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Answer:

Cresol red

Explanation:

Cresol red has two color change intervals that bracket the pH of each equivalence point, and with a bit more precision than those of thymol blue.

what is the free energy change for the formation of one mole of ammonia from its elements under standard conditions? 2nh3 (g) --> n2 (g) 3h2 (g) delta g`

Answers

Negative 16.5 kilojoules per mole is the standard free energy change required to produce one mole of ammonia from its constituent components under normal circumstances.

what is free energy?

The quantity of internal energy that is accessible for work in a thermodynamic system is known as free energy in chemistry. It is energy that can be used to do work. As a spontaneous reaction develops, free energy is released. According to the formula G = H T S, the free energy is the difference between the energy created by the process, H, and the energy lost to the environment, T S. The energy that is made accessible (or "free" to conduct productive work") by the process is the difference between the energy created and the energy wasted. As a result, the free energy change required to produce two moles of ammonia from its constituent components under ideal conditions is equivalent to a negative 33 kilojoules per mole.

Therefore Like internal energy, enthalpy, and entropy, free energy is a thermodynamic state function.

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a commercial process for preparing ethanol (ethyl alcohol), , consists of passing ethylene gas, , and steam over an acid catalyst to speed up the reaction. the gas phase reaction is

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The gas phase reaction for the commercial process of preparing ethanol (ethyl alcohol) involves the reaction between ethylene gas (C2H4) and steam (H2O) over an acid catalyst.

This process is known as the hydration of ethylene.

The reaction can be represented by the following equation:

C2H4 + H2O → C2H5OH

In this reaction, ethylene gas and steam combine to form ethanol. The acid catalyst, which is often a solid acidic material such as phosphoric acid or zeolite, helps to accelerate the reaction by providing a suitable environment for the chemical transformation.

The acid catalyst facilitates the protonation of the ethylene molecule, making it more susceptible to nucleophilic attack by the hydroxide ion derived from water. This leads to the formation of a carbocation intermediate, which is then further attacked by water, resulting in the formation of ethanol.

The gas phase reaction is preferred in this commercial process due to its higher efficiency and better control over the reaction conditions. By passing ethylene gas and steam over the acid catalyst, the reaction can be carried out at elevated temperatures and optimized reaction conditions to maximize the yield of ethanol.

In conclusion, the gas phase reaction for preparing ethanol involves the hydration of ethylene by steam in the presence of an acid catalyst.

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To keep and protect something from damage, change, or waste

a
deforest
b
eliminate
c
conserve
d
consume

Answers

Answer:

c conserve

Explanation:

To conserve means to keep something from waste

For the gas phase decomposition of dimethyl ether at 500 °C CH3OCH3CH4 + H2 + CO the following data have been obtained: [CH3OCH3], M 0.111 6.52×10-2 3.83×10-2 2.25×10-2 time, min 0 22.2 44.4 66.6 The average rate of disappearance of CH3OCH3 over the time period from t = 0 min to t = 22.2 min is M min-1.

Answers

The average rate of disappearance of CH3OCH3 over the time period from t = 0 min to t = 22.2 min is 2.07×10-3 M/min.

To calculate the average rate of disappearance of CH3OCH3 (dimethyl ether) over the time period from t = 0 min to t = 22.2 min, we need to determine the change in concentration of CH3OCH3 divided by the change in time.

The initial concentration of CH3OCH3 is 0.111 M, and after 22.2 min, it decreases to 6.52×10-2 M. Therefore, the change in concentration is 0.111 M - 6.52×10-2 M = 4.59×10-2 M.

The change in time is 22.2 min - 0 min = 22.2 min.

Now we can calculate the average rate of disappearance:

Average rate = (Change in concentration) / (Change in time)

= (4.59×10-2 M) / (22.2 min)

= 2.07×10-3 M/min

Therefore, the average rate of disappearance of CH3OCH3 over the time period from t = 0 min to t = 22.2 min is 2.07×10-3 M/min.

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explain why teh ph of a solution containing both acetic acid and sodium acetate is higher than that of a solution containing the same concentration of acetic acid alone

Answers

The hydrogen ions is removed by the acetate ions making the solution to have a higher pH.

Why is the pH higher?

In general, adding sodium acetate to an acetic acid solution will raise its pH compared to using the same quantity of acetic acid alone this is due to the removal of the hydrogen ions called the buffer effect.

The number of acetate ions in the solution will depend on the concentration of sodium acetate added.

A buffer solution, which can withstand pH shifts when modest amounts of acid or base are added to it, produces this effect.

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Lactic acid, ch3 chocooh, gets its name from sour milk, from which it was first isolated in 1780 (l. Lactis, milk). K a for lactic acid is 8. 4 x 10 -4. Find the [h ] in a sample of sour milk containing 0. 100 m lactic acid

Answers

The concentration of H⁺ in the sour milk is approximately 8.4 × 10⁻⁴ M.

The dissociation of lactic acid can be represented by the following chemical equation:

CH₃CHOCOOH ⇌ CH₃CHOCOO⁻ + H⁺

The equilibrium constant expression for this reaction is:

Ka = [CH₃CHOCOO⁻][H⁺]/[CH₃CHOCOOH]

At equilibrium, the concentrations of the reactants and products are related by this expression. However, we are not given the concentrations of the reactants and products, only the concentration of lactic acid, so we need to make some assumptions.

Since Ka is relatively small, we can assume that the dissociation of lactic acid is incomplete and that most of the lactic acid remains in the undissociated form. This means that we can assume that the concentration of lactic acid is approximately equal to the initial concentration, [CH₃CHOCOOH] = 0.100 M.

We can also assume that the concentration of the lactic acid anion, CH₃CHOCOO⁻, is negligible compared to the concentration of lactic acid.

Using these assumptions, we can simplify the equilibrium constant expression as follows:

Ka = [H⁺][CH₃CHOCOO⁻]/[CH₃CHOCOOH] ≈ [H⁺][CH₃CHOCOO⁻]/0.100

Since the concentration of CH₃CHOCOO⁻ is negligible, we can further simplify the expression:

Ka ≈ [H⁺] × 10⁻⁴

Solving for [H⁺], we get:

[H⁺] = Ka / 10⁻⁴ = (8.4 × 10⁻⁴) / 10⁻⁴ = 8.4 × 10⁻⁴ M

Therefore, the concentration of H⁺ in the sour milk is approximately 8.4 × 10⁻⁴ M.

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How does the amount of heat absorbed by an object depend on the type of surface?

(Talk about radiation and use science terminology)

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Reflective surfaces absorb less heat because the incoming energy is reflected away.

What is Heat transfer?

Heat transfer is a thermal engineering subject that deals with the generation, consumption, conversion, and exchange of thermal energy between physical systems.

Heat transmission techniques include thermal conduction, thermal convection, thermal radiation, and energy transfer via phase shifts.

Radiation, conduction, and convection are all methods of transferring heat energy.

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write balanced half-reactions for the following redox reaction: 6cl2(g) c2h5oh(l) 3h2o(l)→ 12cl−(aq) 2co2(g) 12h (aq)

Answers

By adding these half-reactions together, we get the overall balanced redox reaction:
C2H5OH(l) + 6Cl2(g) + 3H2O(l) → 2CO2(g) + 12Cl-(aq) + 12H+(aq)

To write the balanced half-reactions for the given redox reaction, we need to first separate it into oxidation and reduction half-reactions.
Oxidation half-reaction: C2H5OH(l) → 2CO2(g) + 8H+(aq) + 8e-
Reduction half-reaction: 6Cl2(g) + 12e- → 12Cl-(aq)
In the oxidation half-reaction, the ethanol (C2H5OH) molecule is losing electrons and getting oxidized to carbon dioxide (CO2) gas. Additionally, it is releasing hydrogen ions (H+) into the solution. The number of electrons lost by the ethanol molecule needs to be balanced with the number of electrons gained in the reduction half-reaction.
In the reduction half-reaction, the chlorine (Cl2) molecule is gaining 12 electrons and getting reduced to chloride ions (Cl-). The number of electrons gained by the chlorine molecule needs to be balanced with the number of electrons lost in the oxidation half-reaction.
By adding these half-reactions together, we get the overall balanced redox reaction:
C2H5OH(l) + 6Cl2(g) + 3H2O(l) → 2CO2(g) + 12Cl-(aq) + 12H+(aq)

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an excited h atom with the electron in energy level 6 emits a photon of wavelength 94 nm. what energy level does the electron drop to?

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The excited hydrogen atom with the electron in energy level 6 emits a photon of wavelength 94 nm when the electron drops to energy level 4.

The excited hydrogen atom emits a photon of wavelength 94 nm, which corresponds to a photon energy of 13.2 electron volts (eV) using the formula E = hc/λ, where h is Planck's constant and c is the speed of light. This photon is emitted when the electron drops from a higher energy level to a lower energy level.

To determine the energy level the electron drops to, we can use the formula for the energy of an electron in a hydrogen atom:

[tex]E_n = -13.6/n^2 eV[/tex]

where n is the principal quantum number of the energy level. The excited electron is in energy level 6, so its initial energy is [tex]-13.6/6^2 = -0.75 eV[/tex]. When the electron drops to a lower energy level, the energy difference between the initial and final levels is equal to the energy of the emitted photon.

Using the formula [tex]E = E_i - E_f[/tex], where [tex]E_i[/tex] is the initial energy level and [tex]E_f[/tex] is the final energy level, we can solve for [tex]E_f[/tex]:

[tex]E_f = E_i - E = -0.75 eV - 13.2 eV = -13.95 eV[/tex]

Plugging this value into the formula for the energy of an electron in a hydrogen atom, we can solve for the principal quantum number n:

[tex]n^2 = 13.6/-E_fn^2 = 13.6/13.95[/tex]

n ≈ 3.97

Since n must be a positive integer, the electron drops to the energy level with a principal quantum number of 4. Therefore, the excited hydrogen atom with the electron in energy level 6 emits a photon of wavelength 94 nm when the electron drops to energy level 4.

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Which of the following would be considered a type of wireless media?
a. unshielded twisted pair
b. shielded twisted pair
c. coaxial cable
d. microwave
e. fiber optics

Answers

Out of the options given, fiber optics would be considered a type of wireless media. This is because fiber optics use light waves to transmit data, rather than physical wires. Wireless media refers to any method of transmitting information without the use of physical wires or cables. Coaxial cable, on the other hand, is a type of physical cable that is used to transmit data.
Neither coaxial cable nor fiber optics are considered wireless media. Wireless media refers to communication methods that don't require physical connections, like radio waves or infrared signals. Both coaxial cable and fiber optics are wired media, as they involve physical cables for transmitting data.

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during the lab session your group will make several drip brews. what brew parameter(s) should be the same for all brews?'

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During the lab session, your group will be making several drip brews, and it is important to ensure consistency and accuracy in the brewing process. To achieve this, there are several brew parameters that should be the same for all brews.

Firstly, the coffee to water ratio should be consistent for all drip brews. This means using the same amount of coffee and water for each brew, to ensure the same strength and flavor in the final product. Secondly, the grind size should be consistent for all brews. This means using the same grind size for all coffee beans, which will impact the extraction rate and affect the taste of the coffee. Thirdly, the water temperature should be consistent for all brews. This means using the same water temperature for all brews, which will impact the extraction rate and affect the taste of the coffee. Lastly, the brewing time should be consistent for all brews. This means allowing the same amount of time for each brew, to ensure consistency in the brewing process and prevent over or under extraction.

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dtermine the molar concentration of ethanol in. wine that is 14thanol by mass. the density of this wine is 0.93 g/vm3

Answers

The molar concentration of ethanol in the wine is 2.83 M.  To determine the molar concentration of ethanol in the wine.

We need to convert the given mass percentage of ethanol to molarity.

Let's assume we have 100 g of the wine. Then the mass of ethanol in the wine is:

mass of ethanol = 14% x 100 g = 14 g

Using the molar mass of ethanol (46.07 g/mol), we can calculate the number of moles of ethanol in 14 g:

moles of ethanol = 14 g / 46.07 g/mol = 0.304 mol

The volume of the wine can be calculated using its density:

volume of wine = 100 g / 0.93 g/mL = 107.5 mL = 0.1075 L

Therefore, the molar concentration of ethanol in the wine is:

molarity of ethanol = moles of ethanol / volume of wine = 0.304 mol / 0.1075 L = 2.83 M

So the molar concentration of ethanol in the wine is 2.83 M.

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4a) (10 pts) for each of the following pairs of reactions, indicate which one will be faster and brieflyexplain why. if you expect no significant difference in the reaction rates, say so. no explain

Answers

SN₂ reaction will be faster because tertiary alkyl halides undergo SN₁  reaction via carbocation intermediate; E₂ reaction will be faster because primary alkyl halides undergo E₂ reaction; addition reaction will be faster because HBr is a strong electrophile; acid-catalyzed hydration reaction will be faster because it involves the addition of water to alkene

Pair 1: SN₁  vs SN₂ reaction of tertiary alkyl halide with a strong nucleophile.

The SN₂ reaction will be faster because tertiary alkyl halides undergo SN₁  reaction via carbocation intermediate, which is hindered due to the presence of bulky alkyl groups. The steric hindrance makes it difficult for the carbocation to form, and the reaction proceeds via SN₂ mechanism, where the strong nucleophile attacks the substrate from the backside, leading to inversion of configuration.

Pair 2: E₁ vs E₂ reaction of primary alkyl halide with a strong base.

The E₂ reaction will be faster because primary alkyl halides undergo E₂ reaction instead of E₁ reaction. The E₁ mechanism involves the formation of carbocation intermediate, which is less stable for primary alkyl halides due to the absence of any stabilizing groups. In contrast, the E₂ mechanism proceeds via a one-step concerted process, where the base removes the beta-hydrogen, leading to the formation of a double bond.

Pair 3: Addition vs elimination reaction of an alkene with HBr.

The addition reaction will be faster because HBr is a strong electrophile that can readily add to the pi-bond of the alkene. The addition reaction leads to the formation of a bromoalkane, whereas the elimination reaction leads to the formation of a dihaloalkene. However, the elimination reaction is less favored as it requires the breaking of a carbon-carbon double bond.

Pair 4: Acid-catalyzed hydration vs hydrolysis of an alkene.

The acid-catalyzed hydration reaction will be faster because it involves the addition of water to the alkene in the presence of a strong acid catalyst. The acid protonates the double bond, making it more susceptible to nucleophilic attack by water. In contrast, the hydrolysis reaction involves the breaking of the carbon-oxygen double bond, which is thermodynamically unfavorable.

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pace the following in order of o-s-o bond angles. so42-, so32-, so3

Answers

The order of O-S-O bond angles in the given species is as follows:

SO3 < SO32- < SO42-

In SO3, all three oxygen atoms are bonded to the sulfur atom by double bonds, and the molecule has a trigonal planar shape. Therefore, the O-S-O bond angle is 120°.

In SO32-, one of the oxygen atoms is bonded to the sulfur atom by a single bond, and the other two oxygen atoms are bonded to the sulfur atom by double bonds. The molecule has a trigonal pyramidal shape, with the single-bonded oxygen atom occupying one of the corners. Therefore, the O-S-O bond angle is less than 120°.

In SO42-, two of the oxygen atoms are bonded to the sulfur atom by double bonds, and the other two oxygen atoms are bonded to the sulfur atom by single bonds. The molecule has a tetrahedral shape, with the four oxygen atoms occupying the corners of the tetrahedron. Therefore, the O-S-O bond angle is the smallest in this species, less than the O-S-O bond angle in SO32.

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The lab procedure you just read involved several factors, listed below. Some were variable, and some were constant. Use the drop-down menus to label each factor with V for variable or C for constant.


molarity of HCl used as analyte

molarity of NaOH used as titrant


volume of HCl

volume of NaOH


temperature of HCl

temperature of NaOH

Answers

molarity of HCl used as analyte: C

molarity of NaOH used as titrant: C

volume of HCl: V

volume of NaOH: V

temperature of HCl: V

temperature of NaOH: V

Therefore, in the given lab procedure, the molarity of HCl used as the analyte and the molarity of NaOH used as the titrant were kept constant, while the volumes of the solutions and the temperatures of the solutions were varied to determine the unknown concentration of the HCl solution.

In a titration experiment, the molarity of the acid or analyte solution and the molarity of the base or titrant solution are usually kept constant. This is because the amount of the analyte required to react with the titrant depends on the molarity of both solutions, and changing the molarity of either solution will affect the stoichiometry of the reaction.

On the other hand, the volume of the analyte and the titrant are typically variable factors in a titration experiment. The volume of the analyte and the titrant used in the titration can be adjusted to achieve the desired reaction stoichiometry and determine the unknown concentration of the analyte.

The temperature of the solutions can also affect the reaction rate and should be kept constant throughout the titration to ensure accurate and reproducible results. However, in some cases, the temperature of the solutions may be a variable factor that needs to be controlled and measured during the titration.

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the air in an organ pipe is replaced by helium (which has a lower molar mass than air) at the same temperature. how does this affect the normal-mode frequencies of the pipe?

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The speed of sound in helium is higher than in air, the normal-mode frequencies of the pipe would be higher when helium is used instead of air. This means that the pitch of the sound produced by the pipe would be higher when helium is used.

Replacing air with helium in an organ pipe would affect the normal-mode frequencies of the pipe. The speed of sound in a gas is proportional to the square root of the ratio of the gas's adiabatic bulk modulus to its density. The adiabatic bulk modulus is related to the speed of sound in the gas and the gas's density. Since helium has a lower molar mass than air, its density is lower than air at the same pressure and temperature.

Therefore, the adiabatic bulk modulus of helium is lower than that of air. This means that the speed of sound in helium is higher than in air. The frequencies of normal modes of a pipe depend on the speed of sound in the gas, the length of the pipe, and the boundary conditions.

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a 8.69-g piece of solid co2 (dry ice) is allowed to sublime in a balloon. the final volume of the balloon is 1.00 l at 303 k. what is the pressure of the gas?

Answers

The pressure of the CO2 gas inside the balloon at a temperature of 303 K is approximately 4.76 atm.

he pressure of the CO2 gas inside the balloon at a temperature of 303 K is approximately 4.76 atm.

The sublimation of solid carbon dioxide (CO2) to gaseous CO2 occurs at standard pressure (1 atm) and a temperature of -78.5°C (-109.3°F). Therefore, we can assume that the CO2 gas inside the balloon is at a pressure of 1 atm.

To determine the pressure of the CO2 gas inside the balloon at a temperature of 303 K, we can use the ideal gas law:

PV = nRT

where P is the pressure of the gas, V is the volume of the balloon, n is the number of moles of CO2 gas, R is the ideal gas constant, and T is the temperature of the gas in kelvins.

First, we need to determine the number of moles of CO2 gas that are present in the balloon. We can do this by using the molar mass of CO2 and the mass of the solid CO2 that was initially placed in the balloon:

n = m/M

where m is the mass of the solid CO2 and M is the molar mass of CO2.

The molar mass of CO2 is approximately 44.01 g/mol, so the number of moles of CO2 gas can be calculated as:

n = 8.69 g / 44.01 g/mol = 0.1973 mol

Now we can use the ideal gas law to calculate the pressure of the CO2 gas inside the balloon:

P = nRT/V

where R is the ideal gas constant, which has a value of 0.0821 L·atm/(mol·K).

Substituting the known values into the equation, we get:

P = (0.1973 mol)(0.0821 L·atm/(mol·K))(303 K) / 1.00 L

Simplifying the expression, we get:

P = 4.76 atm

Therefore, the pressure of the CO2 gas inside the balloon at a temperature of 303 K is approximately 4.76 atm.

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name each complex ion or coordination compound. a. [cu(en)2] 2 b. [mn(co)3(no2)3] 2 c. na[cr(h2o)2(ox)2] d. [co(en)3][fe(cn)6]

Answers

a. [Cu(en)2]2 is named "bis(ethylenediamine)copper(II) ion." The ligand ethylenediamine (en) is a bidentate ligand that forms two bonds with the copper (II) ion. The roman numeral II in parentheses indicates the charge of the copper ion.

b. [Mn(CO)3(NO2)3]2 is named "tricarbonyl nitrosyl tri-nitro manganese(II) ion." In this compound, Mn is the central metal ion, and the ligands are NO2 and CO. The NO2 ligand is bidentate, while the CO ligand is monodentate. The roman numeral II in parentheses indicates the charge of the manganese ion.

c. Na[Cr(H2O)2(Ox)2] is named "sodium bis(oxalato)diaquachromium(III)." In this compound, the chromium ion is coordinated to two H2O ligands and two oxalate (Ox) ligands. The roman numeral III in parentheses indicates the charge of the chromium ion.

d. [Co(en)3][Fe(CN)6] is named "tris(ethylenediamine)cobalt(III) hexacyanoferrate(II)." The ligand ethylenediamine (en) forms three bonds with the cobalt ion. The hexacyanoferrate(II) ion is a complex ion consisting of an iron(II) ion coordinated to six cyanide ligands. The roman numerals III and II in parentheses indicate the charges of the cobalt and iron ions, respectively.

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Stem cells can give rise to many different types of cells. How could stem cells most likely be used in the medical field? A. to delete a defective gene in a person's DNA B. to improve the ability of doctors to diagnose genetic diseases C. to replace damaged nerve cells in a paralyzed person's spine D. to allow a person to change their physical traits

Answers

Stem cells have the potential to be used in a variety of ways in the medical field, but one of the most promising applications is their ability to replace damaged or diseased cells and tissues. Option C, "to replace damaged nerve cells in a paralyzed person's spine," is an example of how stem cells could be used to help treat certain conditions.

Stem cells have the unique ability to differentiate into different cell types and can be directed to become specific types of cells depending on the signals they receive from their environment. This means that stem cells could be used to generate healthy nerve cells to replace damaged ones in a person's spine, potentially restoring function to paralyzed areas of the body.

While stem cells may hold promise for other applications, such as gene therapy (option A) or disease diagnosis (option B), these are still areas of ongoing research and development, and their use is not yet widespread. Similarly, the idea of using stem cells to change physical traits (option D) is currently a topic of ethical debate and is not a widely accepted medical application.

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if 20.0 g of ch4 reacts with excess oxygen, what is the change in enthalpy for the reaction? ch4(g) 2o2(g)⟶co2(g) 2h2o(l) δh=−890.4kjmol

Answers

The change in enthalpy (ΔH) for the given reaction can be calculated using the given enthalpy of reaction (ΔHrxn) and the amount of methane (CH4) that is reacting.

The balanced equation for the combustion of methane is:

CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

The enthalpy change for this reaction is given as ΔHrxn = -890.4 kJ/mol.

To calculate the change in enthalpy for the given reaction, we need to first determine the moles of CH4 that react. The molar mass of CH4 is 16.04 g/mol, so 20.0 g of CH4 corresponds to:

20.0 g CH4 x (1 mol CH4/16.04 g CH4) = 1.248 mol CH4

According to the balanced equation, 1 mol of CH4 reacts with 2 mol of O2. Since O2 is in excess, we can assume that all of the CH4 will react. Therefore, the moles of O2 that react are:

2 x 1.248 mol CH4 = 2.496 mol O2

Now we can use the given ΔHrxn value to calculate the change in enthalpy for the reaction:

ΔH = ΔHrxn x (moles of CH4 reacted) = -890.4 kJ/mol x 1.248 mol CH4 = -1110.2 kJ

Therefore, the change in enthalpy for the reaction is -1110.2 kJ.

In conclusion, the change in enthalpy for the combustion of 20.0 g of CH4 with excess O2 is -1110.2 kJ. The negative sign indicates that the reaction is exothermic, meaning it releases heat energy to the surroundings. This result shows that the combustion of methane is a highly exothermic reaction and is used in many industrial and energy-producing processes.

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Explain why PbCl2 did not precipitate immediately on addition of HCI. (What condition must be met by [Pb2+] and [Ci minus] if PbCl2 is to form?) HINT: Precipitation occurs when Qsp is greater than the Ksp The concentration of Ci minus was sufficient to cause Qsp to be greater than the Ksp for the reaction. The concentration of Ci minus was insufficient to cause Qsp to be greater than the Ksp for the reaction. The concentration of Ci minus was insufficient to cause Qs to be less than the Ksp for the reaction. The concentration of Ci minus was sufficient to cause Qsp to be less than the Ksp for the reaction.

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When PbCl2 is added to HCl, it undergoes a reaction to form Pb2+ and 2Cl- ions. The formation of PbCl2 as a precipitate will occur only when the concentration product of Pb2+ and Cl- ions, known as Qsp, exceeds the solubility product constant, Ksp, for PbCl2.

In other words, precipitation occurs when Qsp > Ksp. If the concentration of Cl- ions is insufficient, then Qsp will be less than Ksp and PbCl2 will not form. However, if the concentration of Cl- ions is sufficient, then Qsp will be greater than Ksp and PbCl2 will form as a precipitate. Therefore, PbCl2 did not precipitate immediately on addition of HCl because the concentration of Cl- ions was insufficient to cause Qsp to be greater than Ksp for the reaction.

The condition that must be met by [Pb2+] and [Cl-] for PbCl2 to form is that their concentration product, Qsp, must exceed the solubility product constant, Ksp.

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Write the rate law for the following elementary reaction: ICI(g) + H2(g) → HI(g) + HCl (g) Use k, to stand for the rate constant. rate =

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The rate law for an elementary reaction is determined solely by the stoichiometry of the reactants. Since the reaction given is elementary, we can determine the rate law by looking at the coefficients of the reactants. In this case, we see that the rate of the reaction is directly proportional to the concentrations of ICI and H2. Therefore, the rate law for the reaction is rate = k[ICI][H2].

The rate constant, k, is a proportionality constant that depends on the temperature, the presence of catalysts, and other factors. To write the rate law for the given elementary reaction: ICl(g) + H2(g) → HI(g) + HCl(g), we need to consider the rate constant (k) and the concentrations of the reactants. The rate law for this reaction is given by:

Rate = k [ICl] [H2]
In this equation, "k" is the rate constant, "[ICl]" represents the concentration of ICl, and "[H2]" represents the concentration of H2. The rate law shows that the rate of the reaction is directly proportional to the product of the concentrations of the reactants, ICl and H2.

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a chemist titrates of a hydrocyanic acid solution with solution at . calculate the ph at equivalence. the of hydrocyanic acid is .

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The pH at equivalence for the titration of hydrocyanic acid with a standard base solution is approximately 1.85.

First, we need to know the concentration of the hydrocyanic acid solution (in moles per liter), the concentration of the standard base solution (in moles per liter), and the equivalence point pH (in units of pH). The equivalence point pH is the pH at which the amount of base added is equivalent to the amount of acid present in the solution.

From the given information, we can calculate the concentration of the hydrocyanic acid solution as:

concentration = moles / L

= 0.014 mol/L

The concentration of the standard base solution is not given, so we can't calculate the equivalence point pH directly. However, we can estimate it by assuming a value for the concentration of the standard base solution. For example, let's assume that the concentration of the standard base solution is also 0.014 mol/L.

In this case, we can use the equation for titration:

moles HCN + moles NaOH - moles NaCN = moles NaOH + volume of titrant

At the equivalence point, the amounts of base and acid added are equal, so we can equate the two sides of the equation and solve for the concentration of HCN:

0.014 mol HCN + 0.014 mol NaOH - 0.014 mol NaCN = 0.014 mol NaOH + V

We know that the volume of the base solution added is equal to the volume of the hydrocyanic acid solution titrated, so we can substitute this expression for V:

V = volume of HCN

0.014 mol HCN + 0.014 mol NaOH - 0.014 mol NaCN = 0.014 mol NaOH + 0.014 mol HCN

Solving for HCN, we get:

HCN = 0.0005 mol

The pH at equivalence is given by the expression:

pH = -log[HCN]

Substituting the value of HCN, we get:

pH = -log[0.0005]

pH = 1.85

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suppose a samarium-147 nuclide decays into a neodymium-143 nuclide by emitting an alpha particle. complete the nuclear chemical equation below so that it describes this nuclear reaction.

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Answer:

im not sure

Explanation:

flame test can be used to identify the type of halide ion in the ionic salt. true false

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The statement that flame tests can be used to identify the type of halide ion in the ionic salt is false. Flame tests are primarily used to identify metal ions, not halide ions, in compounds.

Flame tests involve heating a sample in a flame and observing the resulting color of the flame. This method is based on the fact that when an element is heated, its electrons absorb energy and jump to a higher energy level. As the electrons return to their original energy levels, they release energy in the form of light, producing a characteristic color for each element.

However, flame tests are not effective for identifying halide ions. Halide ions, such as chloride, bromide, and iodide, do not produce distinct colors in a flame test like metal ions do. Instead, halide ions can be identified through different chemical tests, such as the silver nitrate test or the halogen displacement reactions. These tests involve the formation of a precipitate or a chemical reaction that results in a color change, providing more accurate identification of halide ions in ionic salts.

In conclusion, flame tests are not a reliable method for identifying the type of halide ion in an ionic salt, as they are more suited for detecting metal ions. Other chemical tests should be used for halide ion identification.

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The blending of two different alleles to create a third unique phenotype. Example: snapdragon: red X white --- > pink

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So, incomplete dominance is a type of genetic inheritance where the phenotype of a heterozygous individual is an intermediate between the two homozygous phenotypes.

The term for the blending of two different alleles to create a third unique phenotype is incomplete dominance.

In the example of snapdragons, the alleles for flower color are represented by R (for red) and W (for white). When a plant with the RR genotype (homozygous dominant) is crossed with a plant with the WW genotype (homozygous recessive), the resulting offspring all have the RW genotype (heterozygous).

In incomplete dominance, the heterozygous phenotype is intermediate between the two homozygous phenotypes. In this case, the flower color of the heterozygous snapdragons is pink, which is intermediate between the red color of the RR homozygotes and the white color of the WW homozygotes.

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would delocalized electrons in a benzene ring become free radicals if they destabilized through sonification amplified with an oxidative metal?

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Since free radicals are thought to be electron-deficient, we observed that every factor that causes an electron donation to a free radical or a free radical's delocalization (or "spreading out") contributes to its stabilisation.

The circle represents the delocalization of the electrons in the compound benzene. Delocalized electrons in chemistry refer to electrons in a molecule, ion, or solid metal that are not linked to a specific atom or covalent connection. Pi bonds formed of loosely held electrons are found in double bonds; as a result, the loosely held electrons move and end up becoming delocalized. The two benzene resonating structures are formed as a result of electron delocalization.

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which human activity began 160 years ago and provide the strongest evidence that humans are responsible for increased atmospheric carbon dioxide concentrations/

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The human activity that began approximately 160 years ago and provides the strongest evidence that humans are responsible for increased atmospheric carbon dioxide concentrations is the widespread burning of fossil fuels, particularly the combustion of coal, oil, and natural gas. This activity releases large amounts of carbon dioxide into the atmosphere as a byproduct, contributing to the greenhouse effect and climate change. The analysis of carbon isotopes in the atmospheric carbon dioxide provides clear evidence that the increase in carbon dioxide concentrations is primarily due to the burning of fossil fuels, as the isotopic signature of fossil fuel emissions differs from natural carbon sources. This evidence points to human activities as the main driver of the increased atmospheric carbon dioxide concentrations.
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