Answer:
0.273504 grams
Explanation:
Charge Deposited = Current ×Time
q=It
Given: I= 17.0A, t= 15.0 seconds
Q= 17×15= 255 C
Since, 1 mole contains 96500C of charge deposition
Therefore, number of moles = 255/96500 = 0.00264 moles
Moreover, since Pb changes to Pb2+,
Hence number of moles of Pb deposited = 0.00264/2
= 0.00132
Also, Molar mass of Lead = 207.2 gm/mol
Therefore, the mass of lead deposited = 0.00132×207.2 = 0.273504 grams
.
26. The water of the surface of the ocean is termed surface currents and moves in a regular pattern. They don't depend on the weather and move heat around Earth. What two things create surface currents?
QUESTION 62
Which of the following pH values represents the highest concentration of H30+ ions?
O pH 5.4
O pH 7.0
O pH 8.7
O All of the above have the same concentration of hydronium ions
O cannnot be determined with the given information
Answer:
5.4
Explanation:
The lower the pH the more H3o+ ions there are
Formula
RnF3+
(2) Lewis dot structure
Formation of RnF₃⁺ will nat takes place easily or if it is form then it will decompose easily.
What is the Lewis dot structure?Lewis dot structure of any compound tells about the bonding and outermost electrons present in all the entities present in that compound.
Radon is a noble gas atom and have stable electronic configuration, but still they form radon flouride products due to the high electronegativity of flourine it attracts the lone pair of electrons of radon.
For the formation of compound promotion of 1, 2 or 3 electrons from the 6p orbital to the vaccant 6d orbitals will give rise to 2, 4 or half filled orbitals so they will form only products with odd number of atoms.
Hence RnF₃⁺ will not form any compound.
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How is thermal energy transferred during conduction? Check all that apply.
1.Thermal energy is transferred between particles that are not touching each other.
2.Thermal energy is transferred between particles that are in direct contact with each other.
3.Thermal energy is transferred between objects of different temperatures.
4.Thermal energy is transferred between objects of the same temperature.
5.Thermal energy is transferred from slow-moving particles to fast-moving particles.
6.Thermal energy is transferred from fast-moving particles to slow-moving particles.
Answer:
Thermal energy is transferred between particles that are in direct contact with each other.
Thermal energy is transferred between objects of different temperatures.
Thermal energy is transferred from fast-moving particles to slow-moving particles.
Explanation:
The glycerol-3-phosphate shuttle can transport cytosolic NADH equivalents into the mitochondrial matrix (see Fig. 15.11c). In this shuttle, the protons and electrons are donated to FAD, which is reduced to FADH2. These protons and electrons are subsequently donated to coenzyme Q in the electron transport chain. Given that the number of ATP molecules made per NADH and FADH2 oxidation differ by ____? the amount of ATP generated per mole of glucose when the glycerol-3-phosphate shuttle would be ____ instead of 32.
Answer:
The number of ATP molecules made per NADH and FADH2 oxidation differ by 1.
The amount of ATP generated per mole of glucose when the glycerol-3-phosphate shuttle would be 30 instead of 32.
Explanation:
The glycerol-3-phosphate shuttle can transport cytosolic NADH equivalents into the mitochondrial matrix. In this shuttle, the protons and electrons are donated to FAD, which is reduced to FADH2. These protons and electrons are subsequently donated to coenzyme Q in the electron transport chain. Given that the number of ATP molecules made per NADH and FADH2 oxidation differ by 1, the amount of ATP generated per mole of glucose when the glycerol-3-phosphate shuttle would be 30 instead of 32.
FADH2 generates 1.5 ATP per molecule unlike NADH which generates 2.5 ATP per molecule. This is because electron transfer via FADH2 is not coupled to proton pumping unlike electron transfer reactions involving NADH. Thus, two moles of NADH from the oxidation of 2 moles of glyceraldehyde-2-phosophate to two moles of 1,3-bisphosphoglycerate will yield 3 moles of ATP rather than 5 moles when shuttled through the glycerol-3-phosphate shuttle. The glycerol-3-phosphate shuttle of cytosolic NADH shuttling occurs mainly in the brain and skeletal muscles and does not involve membrane transporters.
A barrel of crude oil has a volume of 42 gallons, only approximately 45% of which is processed into gasoline. If your car achieves 37 mi/gal, and you drive 36,000 miles in one year, how many barrels of crude oil are required to run your car for a year?
The interaction of the skeletal and muscular systems to create movement and locomotion is regulated by which organ system?
A. Nervous
B. Respiratory
C. Digestive
D. Immune
Answer: steaks
Explanation:
A 0.982-g sample of an unknown gas exerts a pressure of 700 mm Hg in a 450-cm3 container at 23oC. Calculate the molar mass of this gas. [1cm3 = 1mL; 1000mL = 1L]
Answer:
57.4 g/mol
Explanation:
Step 1: Convert 450 cm³ to L
We will use the conversion factors 1 cm³ = 1 mL and 1000 mL = 1 L.
450 cm³ × 1 mL/1 cm³ × 1 L/1 mL = 0.450 L
Step 2: Convert 23 °C to Kelvin
We will use the following expression.
K = °C + 273.15 = 23 + 273.15 = 296 K
Step 3: Calculate the number of moles of the gas
We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 700 mmHg × 0.450 L / (62.4 mmHg.L/mol.K) × 296 K = 0.0171 mol
Step 4: Calculate the molar mass of the gas
0.982 g of the gas correspond to 0.0171 moles.
M = 0.982 g/0.0171 mol = 57.4 g/mol
The molar solubility of calcium sulfide in a 0.222 M sodium sulfide solution is:________-
How many grams of NaOH are contained in 5.0*10ml of a0. 77 sodium hydroxide solution
Answer:
1.54grams
Explanation:
Molarity of a solution = n/V
Where;
n = number of moles (mol)
V = volume (L)
Based on the information given in this question;
Volume of NaOH solution = 5.0 × 10ml
= 50ml = 50/1000 = 0.050 L
Molarity = 0. 77 M
Using; Molarity = n/V
0.77 = n/0.05
n = 0.77 × 0.05
n = 0.0385mol
To find the mass (grams) of NaOH in the solution, we use the following formula:
mole (n) = mass/molar mass
Molar mass of NaOH = 23 + 1 + 16 = 40g/mol
0.0385 = mass/40
mass = 0.0385 × 40
mass = 1.54grams.
20. A compound's empirical formula is C5H5O If the molecular mass of the compound is
162.2g, what is the molecular formula? NO LINKS PLEASE:)!
Answer:
Just use a text book.. So that you get the concept
Hence, [tex]C_{20}H_{20}O_4[/tex] is the molecular formula of a compound's empirical formula is [tex]C_5H_5O[/tex].
What is an empirical formula?The empirical formula is the chemical formula of a compound that gives the proportions (ratios) of the elements present in the compound but not the actual numbers or arrangement of atoms.
Divide the molar mass of the compound by the empirical formula mass. The result should be a whole number or very close to a whole number. Multiply all the subscripts in the empirical formula by the whole number
The molar mass of the empirical formula compound [tex]C_5H_5O[/tex] is 46.06844 g/mol.
The molecular mass of the compound is 162.2g given.
162.2g ÷ 46.06844
3.520848546 =4
[tex]C_{20}H_{20}O_4[/tex] is the molecular formula.
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Question 6 of 10
Which of the following produces a physical change?
A. Leaving metal outside in the rain until rust forms on its surface
B. Turning wood into ash
C. Melting butter in a microwave
D. Combining carbon dioxide and water to make sugar
SUBMIT
Answer:
uhhh D .-.
Explanation:
Answer:C
Explanation:
How many moles are in 20.5 grams of Calcium (Ca)? (1pt)
A)762.45 moles
B)1 mole
C)2 moles
D)0.5 moles
Answer:
Number of moles in 20.5 grams of calcium (Ca) = 0.5 moles (Approx.)
Explanation:
Given:
Amount of calcium (Ca) = 20.5 grams
Find:
Number of moles in 20.5 grams of calcium (Ca)
Computation:
Number of moles = Gram weight / Atomic weight of substance
We know that, Atomic weight of calcium (Ca) is 40.078 u
Number of moles in 20.5 grams of calcium (Ca) = Amount of calcium (Ca) / Atomic weight of calcium (Ca)
Number of moles in 20.5 grams of calcium (Ca) = 20.5 / 40.078
Number of moles in 20.5 grams of calcium (Ca) = 0.511
Number of moles in 20.5 grams of calcium (Ca) = 0.5 moles (Approx.)
3 What does the term electrolysis mean?
?
Answer:
Electrolysis is the passing of a direct electric current through an electrolyte producing chemical reactions at the electrodes and decomposition of the materials. The main components required to achieve electrolysis are an electrolyte, electrodes, and an external power source.
Explanation:
Answer:
In chemistry and manufacturing, electrolysis is a technique that uses direct electric current to drive an otherwise non-spontaneous chemical reaction. Electrolysis is commercially important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell.
hope it helps uh....
I am new here...
thanks ^^
What is the importance of a chemical symbol?
Answer:
Chemical symbols are used to standardize the 'language of chemistry' and to identify elements and atoms in a chemical formula easily. Chemical symbols consist of one or two letters, most often derived from the name of the element.
Explanation:
Answer:
Explanation:
A chemical symbol is a notation of one or two letters representing a chemical element. Its used to identify elements and atoms in a chemical formula easily. Chemical symbols consist of one or two letters, most often derived from the name of the element.
How many of each type of atom should react so that the electrons
lost will equal the electrons gained?
Explanation:
ni suna ham naHow many of each type of atom should react so that the electrons
lost will equal the electrons gained?
What is bungee gum made of? A) The properties of both rubber and gum. B) Bungee cord and gum.
Answer:
The proporties of both rubber and gum.
Explanation:
What is the wavelength of a photon with a frequency of 7.81 1014 Hz?
A.
517 nm
B.
384 nm
C.
848 nm
D.
234 nm
Answer:
Option B. 384 nm
Explanation:
From the question given above, the following data were obtained:
Frequency (f) = 7.81×10¹⁴ Hz
Velocity of photon (v) = 3×10⁸ m/s
Wavelength (λ) =?
The wavelength of the photon can be obtained as follow:
v = λf
3×10⁸ = λ × 7.81×10¹⁴
Divide both side by 7.81×10¹⁴
λ = 3×10⁸ / 7.81×10¹⁴
λ = 3.84×10¯⁷ m
Finally, we shall convert 3.84×10¯⁷ M to nm. This can be obtained as follow:
1×10¯⁹ m = 1 nm
Therefore,
3.84×10¯⁷ m = 3.84×10¯⁷ m × 1 nm / 1×10¯⁹ m
3.84×10¯⁷ m = 384 nm
Thus, the wavelength of the photon is 384 nm
bahobilat at dakobilat
Answer:
sorry i didn't understand your question can you explain me your question have a good day hope its helps you ☺
The net ionic equation for formation of an aqueous solution of Al(NO3)3 via mixing solid Al(OH)3 and
aqueous nitric acid is
Answer:
Al(OH)3 (s) + 3H+ (aq) → 3H2O (l) + Al3+ (aq)
Explanation:
The net ionic equation for the reaction between solid Al(OH)₃ and aqueous nitric acid, HNO₃ is
3H⁺(aq) + Al(OH)₃ (s) —> 3H₂O(l) + Al³⁺(aq)The reaction between Al(OH)₃ and HNO₃ will proceeds as follow:
HNO₃ (aq) —> H⁺(aq) + NO₃¯(aq)
HNO₃ (aq) + Al(OH)₃ (s) —>
H⁺(aq) + NO₃¯(aq) + Al(OH)₃ (s) —> H₂O(l) + NO₃¯(aq) + Al³⁺(aq)
Cancel the spectator ion (i.e NO₃¯)
H⁺(aq) + Al(OH)₃ (s) —> H₂O(l) + Al³⁺(aq)
Write 3 before H⁺ and H₂O to obtain the balanced ionic equation as shown below:
3H⁺(aq) + Al(OH)₃ (s) —> 3H₂O(l) + Al³⁺(aq)
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Perform the following operation
and express the answer in
scientific notation.
2.600x10-5 x 6.100x10-5
[? ]x10?)
Answer:
Value of expressions in scientific notation = 15.86 x 10⁻¹⁰
Explanation:
Given expressions:
2.600 x 10⁻⁵ x 6.100 x 10⁻⁵
Find:
Value of expressions in scientific notation
Computation:
2.600 x 10⁻⁵ x 6.100 x 10⁻⁵
2.600 x 6.100 x 10⁻⁵x 10⁻⁵
15.86 x 10⁻⁵ x 10⁻⁵
We know that;
qᵃ x qᵇ = q⁽ᵃ⁺ᵇ⁾
So,
15.86 x 10⁽⁻⁵⁻⁵⁾
15.86 x 10⁽⁻¹⁰⁾
Value of expressions in scientific notation = 15.86 x 10⁻¹⁰
Water vapor _____.
keeps the Earth cool
exists mainly over the poles
traps heat and keeps the Earth warm
is a trace gas
Answer:
traps heat and keeps the Earth warm.
70.8 g of CO is exposed 20.4 g of Hy and a reaction takes place.
CO + 2H2 - CH3OH
1. How many grams of methyl hydroxide (CH3OH) is produced?
2. What is the limiting reactant?
3. How much of the excess reactant is left unused?
literally what does any of this mean
Answer:
1. 80.9 g of CH₃OH
2. CO
3. 5.14moles
Explanation:
The reaction is:
CO + 2H₂ → CH₃OH
First place, we determine the moles of each reactant.
70.8 g . 1mol/ 28g = 2.53 moles of CO
20.4 g . 1mol / 2g = 10.2 moles of H₂
There is too much hydrogen, so the limiting reactant might be the carbon monoxide.
2 moles of H₂ react to 1 mol of CO
Then, 10.2 moles of H₂ may react to (10.2 . 1) /2 = 5.1 moles
We don't have enough CO, so it's ok that CO is the limiting. (We have 2.53 moles, we need 5.1 moles)
In the other hand, hydrogen is the excess reactant.
1 mol of CO react to 2 moles of hydrogen
2.53 moles may react to (2.53 . 2) /1 =5.06 moles
We have 10.2 moles, and we need 5.06 moles. Then (10.2 - 5.06) = 5.14 moles remains after the reaction goes complete.
Now that we know the limiting reactant, we can determine the grams of produced methanol. Ratio is 1:1
1 mol of CO produces 1 mol of CH₃OH
2.53 moles of CO must produce 2.53 moles of CH₃OH
We convert moles to mass: 2.53 mol . 32 g/mol = 80.9 g
how many grams of CaCl2 are required to make 25mL of 1.5
Answer:
Mass of CaCl2 = 4.1625 grams
Explanation:
We will recall that:
For solution: Molarity = [tex]\dfrac{moles \ of \ solute }{volume \ of \ solution (L)}[/tex]
[tex]1.5 = \dfrac{moles}{0.025 }[/tex]
Moles = 0.0375 moles
Mass = no of moles × molar mass(MM)
Molar mass of CaCl2 = 111 g/mol
Mass = 0.0375 mol × 111 g/mol
Mass of CaCl2 = 4.1625 grams
Assume there exists some hypothetical metal that exhibits ferromagnetic behavior and that has (1) a simple cubic crystal structure, (2) an atomic radius of 0.126 nm, and (3) a saturation flux density of 0.69 tesla. Determine the number of Bohr magnetons per atom for this material. Part 1 Correct answer icon Excellent! What is the volume, in m3, for this unit cell
Answer:
[tex]n_b=0.947 Bohr\ magnetons/atom[/tex]
Explanation:
From the question we are told that:
Atomic radius [tex]r=0.126 nm[/tex]
Saturation flux density [tex]B= 0.69 T[/tex]
Generally the equation for number of Bohr magnetons per atom is mathematically given by
[tex]n_b=\frac{B_s*Vc}{\mu_0*\mu_b}[/tex]
Where
[tex]\mu_0=Magnetic\ permeability[/tex]
[tex]\mu_0=1.257 * 10^{-6}[/tex]
[tex]\mu_b=Magnetic\ Moment\ of\ an\ Atom[/tex]
[tex]\mu_b=9.27* 10^{-24}[/tex]
[tex]Vc=d^3[/tex]
[tex]Vc=(2(0.126*10^-9))^3[/tex]
[tex]Vc=1.6*10^{-29}[/tex]
Therefore the number of Bohr magnetons per atom for this material
[tex]n_b=\frac{0.69*1.6*10^{-29}}{1.257 * 10^{-6}*9.27* 10^{-24}}[/tex]
[tex]n_b=0.947 Bohr\ magnetons/atom[/tex]
Select the correct answer
What is the noble gas configuration for silicon?
OA [Ne] 3s^2 3p^1
OB. [Ar] 4s^1
OC [Kr]5s^1
OD. [Ne] 3s^2 3p^2
Answer:
D
Explanation:
Silicon, element number 14 is the fourth element in the third period in the periodic table. Its electronic configuration is 1s^2 2s^2 2p^6 3s^2 3p^2.
The elemental symbol of the previous noble gas preceding the atom is replaced by the arrangement of the remaining electrons to form a noble gas configuration of an atom.
So for Silicon, we substitute [Ne] 1s^2 2s^2 2p^6 and the noble gas configuration can now be [Ne] 3s^2 3p^2.
Looking at the web above, each letter represents a species of animal in an ecosystem food web. Which of the following is most likely to cause the greatest decrease in the species B population.
A decrease in species C
A decrease in species E
A decrease in species D
A decrease in species A
Answer:
a decrease in species A is correct answers
How many moles are in 3.555 g of c2h2?
Answer:
0.13653499904751903
Explanation:
Convert Units .com
The volume of a gas at 2.0 atm is 3.0 L. What is the volume of the gas at 1.5 atm at the same temperature?
0.50 L
1.0 L
1.5 L
4.0 L
By applying Boyle's law, the new volume of this gas is equal to: D. 4.0 L.
Given the following data:
Initial volume = 3.0 L.
New pressure = 1.5 atm.
Initial pressure = 2.0 atm.
How to calculate the new volume?In order to calculate the new volume of this gas, we would apply Boyle's law. Mathematically, Boyle's law is given by this formula:
PV = k
P₁V₁ = P₂V₂
Where:
P represents the pressure.V represents the volume.Making V₂ the subject of formula, we have:
V₂ = (P₁V₁)/P₂
Substituting the given parameters into the formula, we have;
V₂ = (2.0 × 3.0)/1.5
V₂ = 6.0/1.5
V₂ = 4.0 L.
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Answer:
D. 4.0 Liters
Explanation:
I took the exam
Which explanation describes the first part of a chemical reaction? Reactants collide to form products. Products collide to form reactants. Products collide to form a transition state. Reactants collide to form a transition state.
Answer:
Reactants collide to form a transition state.
Explanation:
So sorry if I’m wrong but I feel this is right
To solve such this we must know the concept of chemical reaction. The correct option is option B that is atoms in one compound switch places with atoms in another compound.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.
There are so many types of chemical reaction reaction like combination reaction, double displacement reaction, combustion reaction, displacement reaction. "Reactants collide to form a transition state" describes the first part of a chemical reaction.
Therefore "Reactants collide to form a transition state" describes the first part of a chemical reaction. The correct option is option B.
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