The molarity of iodine solution is containing 25.00 ml of 0.0002487 m ascorbic acid is 0.0002028 M.
We calculate this using ,
Let molarity and volume of ascorbic acid be M₁ and V₁
M₁ = 0.0002487 m
V₁ = 25.00 ml
Molarity of iodine be M₂ .
As , ascorbic acid + I₂ → 2I⁻ + dehydroascorbic acid
By molarity equation,
M₁ V₁ = M₂ V₂
where M₂ is Molarity of iodine and V₂ is volume if iodine.
M₂ = 0.0002487 / 25 ÷ 30.65
M₂ = 0.0002028 M
Therefore, 0.0002028 M is the molarity of the iodine.
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an indium (in) atom has 49 electrons. electrons in which subshell of the indium atom ground state experience the lowest effective nuclear charge (z* or zeff)?
5p subshell of the indium atom ground state experience the lowest effective nuclear charge (Z or Zeff)
Atomic number of indium = 49
E.C of indium = [Kr]4d¹⁰5S²5p¹
The outer 3 electrons indicate that indium is a 3rd group element
In the ground state, the outer electrons of In are present in the 5s and 5p orbitals
So among 5s and 5p which will experience the lowest nuclear charge (Zeff)
The nuclear charge depends on the shape of the orbital
5s has spherical shape while 5p has DB shape
Among the spherical and DB shape, the second one experiences the lower nuclear charge.
So the answer is 5p subshell of the indium will experience the lowest effective nuclear charge (Z or Zeff)
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calculate the number of moles of argon gas contained in a 4.00 l container at 1620. kpa and 25.0 oc. if the gas is helium instead of argon, will the answer change? explain 2.62 moles
The number of moles of argon gas in a 4L container at 1620KPa and 25C is 2.62 moles. This can be calculated by ideal gas equation. The number of moles will not change when the argon gas is replaced by helium gas.
What is an ideal gas equation?
The ideal gas equation states the relation between pressure, volume, number of moles and temperature. The pressure multiplied by volume is directly proportional to the number of moles multiplied to the temperature. The equation can be written as, PV = nRT.
According to the ideal gas equation,
PV = nRT
P is pressure, n is number of moles, T is temperature, V is volume.
n = 1620KPa x 4L / 8.314Jmol^-1K^-1 x 298K = 2.62 moles.
Therefore, according to ideal gas equation, 2.62 moles is the number of moles of the gas in 4L container with 1620KPa pressure and 25C temperature. The number of moles doesn't depend on the gas. So it doesn't change when argon gas is replaced with helium gas.
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12) A solution of acetic acid, HC2H3O2, on a laboratory shelf was of undetermined concentration. If the pH of the solution was found to be 2.68, what was the concentration of the acetic acid? (Ka = 1.7 x 10-5)
HC2H3O2 (aq) + H2O(l) C2H3O2-(aq) + H3O+(aq)
The concentration of acetic acid in the solution is 0.257 M.
What is the concentration of acetic acid in the solution?The concentration of acetic acid in the solution is determined from the Henderson- Hasselbalch equation as follows:
pH = pKₐ + log ([A⁻]/[HA])where;
pKa = - log(Ka) of acetic acid[A⁻] = concentration of acetate[HA] = concentration of acetic acidpKa = - log(1.7 * 10⁻⁵)
pKa = 4.77
Equation of reaction: HC₂H₃O₂ (aq) + H₂O(l) --> C₂H₃O₂⁻ (aq) + H₃O⁺ (aq)
From the equation of reaction; [A⁻] = [H₃O⁺]
[H₃O⁺] = antilog -(pH)
[H₃O⁺] = antilog (-2.68)
[H₃O⁺] = 0.002
[A⁻] = 0.002
[HA] = [A⁻] / antilog of (pH - pKa)
[HA] = [A⁻] / antilog (2.68 - 4.77)
[HA] = 0.002 / 0.00812
[HA] = 0.257 M
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Identify the overall molecular dipole moment of water using a vector arrow.
The overall dipole moment of the water molecule is shown in the image attached.
What is dipole moment?We know that there is a dipole that exists in a molecule when there is an electronegativity difference between the atoms that are in the molecule. In the case of the water molecule, there is an electronegativity difference that exists between the atoms of the water molecule.
Now, hydrogen is the positive end of the dipole and the oxygen is the negative end of the dipole. We have seen the structures of the dipole moment. Now, the overall dipole moment of the water molecule is shown in the image attached.
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a 1.00 l solution contains 24.52 g of nitrous acid, hno2. what mass of sodium nitrite, nano2, should be added to it to make a buffer with a ph of 3.46? ka (hno2)
26.21g NaNO₂ is added to it to make a buffer with a pH of 3.46.
Describe buffer solution.A buffer solution's pH will not change when a small amount of an acid or an alkali is added.
A buffer solution that is acidic has a pH lower than 7, to put it simply. Acidic buffer solutions are usually made by mixing a weak acid with one of its salts, usually sodium salt.
A buffer solution with an alkaline pH exceeds 7. Alkaline buffer solutions are often made by mixing a weak base with one of its salts.
moles of HNO₂ = 24.52g HNO₂ ×[tex]\frac{1 mol HNO2}{47.013gHNO2}[/tex]
moles of HNO₂ = 0.33 moles HNO₂
pKa for HNO₂,
pKa = -log(Ka)
pKa = -log(4.0 × 10⁻⁴)
pKa = 3.39
Now, By using the Henderson-Hasselbach equation: determine the moles of NaNO₂.
Hence, both compounds (Weak base and acid) have same volume.
also use moles instead of concentrations:
pH = pKa + log ( [tex]\frac{moles NaNO2}{moles HNO2}[/tex])
moles of NaNO₂ = moles of HNO₂ × 10[tex]^{pH-pKa}[/tex]
moles of NaNO₂ = 0.33 moles × 10³°4⁶⁻³°³⁹
moles of NaNO₂ = 0.38 moles
moles of NaNO₂ to grams of NaNO₂,
= 0.38 × (68.99/1)
= 26.21g NaNO₂
amount of NaNO₂ is 26.21g.
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(c) if 54.8 ml of bacl2 solution is needed to precipitate all the sulfate in a 534 mg sample of na2so4 (forming baso4), what is the molarity of the solution?
The molarity of the solution is 66.207 M.
1) number of moles of Na2SO4
number of moles = mass/molar mass = 534/142 = 3.7605633 moles
To precipitate 3.7605633 moles of Na2SO4 we need the same amount of moles of BaCl2 = 3.7605633 moles.
2) molarity of BaCl2 solution
concentration = number of moles/volume = 3.7605633/0.0568
= 66.20710 M
Molarity is defined as the total number of moles of solute in one kilogram of solvent. Molarity is also called molarity.
The symbol for molarity is a capital M. In chemistry, a solution is a mixture of two or more substances in which none of the substances are chemically changed. The formula for calculating molarity is the ratio of the moles of solute for which the molarity is calculated and the volume of solvent used to dissolve the particular solute.
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what is the estimated effective nuclear charge, zeff, experienced by an electron in a 3p orbital of a chlorine atom?
The estimated nuclear charge on an electron in a 30 orbital of chlorine atom is 6.1
The charge that the outermost valence electrons of any many-electron atom experience is known as the effective nuclear charge. This is done by taking into account how many shielding electrons there are surrounding the nucleus. Rule of Slater: The effective nuclear charge that an electron in a multi-electron atom experiences is measured using this method. This rule states that the screening effect of the other electrons in the atom causes the actual nuclear charge an electron experiences to be smaller than the actual nuclear charge. An atom's distribution of electrons within its atomic orbitals is known as its electronic configuration.
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Why are group IA elements called alkali metals??
Answer:
All forms of hydroxides
Explanation:
The metals in Group IA (Li, Na, K, Rb, Cs, and Fr) are called alkali metals because they all form hydroxides (such as NaOH) that were once known as alkalies. The electron configurations of the alkali metals are characterized by a single valence electron.
what organic analytical technique is paired with the visible spectrum and cannot confirm a substances identity
The organic analytical technique that is paired with the visible spectrum and cannot confirm a substances identity is Spectrophotometry.
What is Spectrophotometry?
By measuring the intensity of light as a beam of light travels through a sample solution, a technique called spectrophotometry can determine how much light a chemical component absorbs. Every substance either absorbs or transmits light across a specific spectrum of wavelengths, according to the fundamental tenet. A known chemical substance's concentration can also be determined using this method. In several disciplines, including chemistry, physics, biochemistry, material and chemical engineering, and therapeutic applications, spectrophotometry is one of the most beneficial quantitative analysis techniques.For more informations on spectrophotometry follow
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Diana measured 233 mL for the volume of the object. The actual volume of the object was 241 mL. What is the percent error of Diana’s results?
Answer:
3.32%
Explanation:
To calculate the percent error, you need to use the following equation:
| measured value - actual value |
Percent Error = -------------------------------------------------- x 100%
actual value
In this equation, the measured value is the amount generated after running an experiment. The actual value is the amount generated solely through calculations.
Measured Value = 233 mL
Actual Value = 241 mL
| 233 mL - 241 mL |
Percent Error = -------------------------------- x 100%
241 mL
8 mL
Percent Error = ----------------- x 100%
241 mL
Percent Error = 0.0332 x 100% = 3.32%
if the half life of radium-223 is 12 days, how long will it take for 100 atoms of radium-223 to decay with only 25 atoms of radium-223 left?
It will take 24 days for 100 atoms of radium-223 to decay with only 25 atoms of radium-223 left
What is half life?Half-life is the time required for a quantity to a radioactive substance reduce to half of its initial value. The term is often used in nuclear physics to describe how quickly an unstable atom radioactively decays or how long a stable atom survives. The term can also be used to characterize any type of exponential decay.
Given,
Half life of radium-223 = 12 days
If 100 atoms decay leaving 25 this means = 3/4 decay
Aₓ = A₀ × [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]
Where, Aₓ = the amount left after t years
A₀ = the initial quantity of the substance that has to be decayed
[tex]t_{1/2}[/tex] = the half-life of the decay
So, for 3/4 decay:
A₀ × 1/4 = A₀ × [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]
1/4 = [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]
[tex](\frac{1}{2} )^{2}[/tex] = [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]
[tex]\frac{t}{t_{1/2} }[/tex] = 2
Since, Half life of radium-223 = 12 days
then,
t/12 = 2
t = 12 × 2
t = 24 days
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Many alcohols, including ethanol, are soluble in water.
Explain, with the aid of a diagram, why ethanol is soluble in water.
Include relevant dipoles and lone pairs.
Answer:
because ethanol is polar
Explanation:
polar dissolves in polar. Ethanol has a hydroxyl(-OH) functional group in it.
Due to the presence of a bond between electronegative atom oxygen and hydrogen, the O-H bond acquires polarity.
Hence, due to the presence of polarity in O-H bond, it forms a Hydrogen bond with water which is responsible for the responsibility of ethanol in water.
q12 (1pts) which one of the following molecules has an atom with an incomplete octet? a) nf3 b) h2o c) ascl3 d) geh4 e) bf3
The following molecules has an atom with an incomplete octet is BF₃.
the following molecules given as follows :
a) NF₃ - it follow the octet rule. all the atom present have there octet complete. the molecule is stable;
b) H2O - all the have complete octet.
c) AsCl₃ - all the atoms have 8 electron in valence shell and follow octet rule.
d) GeH₄ - thos molecule also follow the octet rule
e) BF₃ - not follow the octet and have incomplete octet. Boron atom have in complete octet.
thus, The following molecules has an atom with an incomplete octet is BF₃.
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DART sent images from a camera to record its progress.
How were the collision and the results of the collision recorded?
DART sent images from a camera to record its progress. The collision and the results of the collision were recorded by the International Space Station.
What is DART?DART stands for Double Asteroid Redirection Test. The investigative team of the (DART) mission indicates that the spacecraft's kinetic contact with its target asteroid, Dimorphos, successfully changed the asteroid's orbit.
Asteroid is a small planet in our Solar System. Asteroids range in size and shape from 1-meter boulders to a dwarf planet almost 1000 kilometers in diameter; they are stony, metallic, or ice worlds with no atmosphere.
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Determine which base will work to deprotonate each compound in an acid/base extraction.
Bases that are useful for deprotonating compounds are:
NaHCO₃ or NaOH.
metal alkoxide
Sodium hydroxide
Benzene rings with carboxylic acids that are weak acids can be prepared using NaOH or NaHCO 3 due to the weakness of the carboxylic acid. deprotonated.
Metal alkoxides such as potassium tert-butoxide can be used to deprotonate benzene rings with three carbon chains attached to one carbon. Also, metal alkoxides are used because the benzene ring containing the hydroxyl group is a very weak acid.
A benzene ring with a hydroxyl group is a weak acid like a benzene ring with a carboxyl group, so it can be deprotonated with NaOH.
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equal volumes of equimolar solutions of ammonium iodide, nh4i, and lead (ii) acetate, pb(ch3coo)2, were combined and a precipitate forms.
Equal volumes of equimolar solutions of ammonium iodide, NH₄I, and lead (ii) acetate, Pb(CH₃COO)₂, were combined and a precipitate forms. The balanced equation is given as :
2NH₄I + , Pb(CH₃COO)₂ ----> PbI₂ + 2NH₄CH₃CO₂
The ammonium iodide, NH₄I react with lead (ii) acetate, Pb(CH₃COO)₂ to form lead(II)iodide and ammonium ethanoate. The balanced equation is given as follows :
2NH₄I + Pb(CH₃COO)₂ ----> PbI₂ + 2NH₄CH₃CO₂
ammonium lead (ii) acetate lead(II)iodide ammonium ethanoate
iodide
Thus, Equal volumes of equimolar solutions of ammonium iodide, NH₄I, and lead (ii) acetate, Pb(CH₃COO)₂, were combined and a precipitate forms. The balanced equation is given as :
2NH₄I + , Pb(CH₃COO)₂ ----> PbI₂ + 2NH₄CH₃CO₂
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Which statement correctly describes how hydrolysis causes chemical weathering? (1 point)
O Water reacts with minerals in rocks to produce carbonic acid, weakening the rock.
O Water reacts with carbon dioxide to produce clay, weakening the rock.
O Water reacts with minerals in rocks to produce clay, weakening the rock.
O Water reacts with carbon dioxide to produce carbonic acid, weakening the rock.
The term chemical weathering is said to occur when water reacts with carbon dioxide to produce carbonic acid, weakening the rock.
What is weathering?The term weathering has to do with the breaking down of the rock. Now we know that rocks are defined as the solid part of the earth's crust. We can find the rocks either at the surface or under the earth.
The process of the breakdown of the rocks can be initiated by many processes and one of the processes is by the break down of the rock by the hydrolysis of the minerals that can be found in the rock. This owes to the formation of acid in the rocks.
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what pairs would form covalent bonds?
Answer:
Covalent bonds usually occur between nonmetals.
Explanation:
Balancing Chemical Equations and Identifying Types of Reactions Assignment.
10th grade Chemistry.
Answer:
how are you doing, please kindly help me with my homework
Chlorine gas will react with iron metal.
Exactly 21.3 g of chlorine reacts with 11.2 g of iron.
How many iron atoms react with 30 molecules of chlorine?
A 10
B 15
C 20
D 30
According to stoichiometry and balanced chemical equation 10 iron atoms react with 30 molecules of chlorine.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is important in balancing chemical equations.It is useful in chemical calculations while making solutions of different concentrations.
Two atoms of iron reacts with 6 molecules of chlorine , so for 30 molecules of chlorine it is, 30×2/6=10 atoms of iron.
Thus, 10 atoms of iron will react with 30 molecules of chlorine.
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4) Complete the notation configuration for Neon.
Answer:
Explanation:
[He]2s²2p⁶
Please help me I've been stuck on this for hours at this point don't bother providing an explanation I need answers
Answer:
I'm not entirely sure about questions 3-5, but I am going to assume you want the products.
3. [tex]Al + O_{2} = AlO_{2}[/tex]
4. [tex]2 Mg + Zn(NO_{3})_{2} = 2 Mg(NO_{3}) + Zn[/tex]
5. [tex]BaCl_{2} + Na_{2}SO_{4} = BaSO_{4} + 2 NaCl[/tex]
As for questions 6-8, it is quite simple,
6. Synthesis Reaction
7. Single Displacement Reaction or another name is Substitution Reaction
8. Decomposition Reaction
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the fat, tripalmitin, when hydrolyzed with aqueous naoh followed by acidification with hcl yields glycerol and palmitic acid. if 0.018 mol of tripalmitin is hydrolyzed, what is the theoretical yield of palmitic acid in moles?
When 0.018 mol of tripalmitin is hydrolyzed, the theoretical yield of palmitic acid will be 0.054 moles.
The hydrolysis of tripalmitin with NaOH is saponification where a glycerol compound and fatty acids are released. Thus the fatty acids combined with the Na ion further react with the acid HCl forming a salt. Tripalmitin is a triglyceride obtained from 3 hydroxy groups of glycerol by palmitic acid (hexadecanoic). Thus, this hydrolysis yield carboxylate salt and alcohol called a saponification reaction.
Hydrolysis of 1 tripalmitin releases 3 fatty acids hence, for 0.018 moles, palmitic acid yielded is,
= 0.018 × 3
= 0.054 moles.
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How many chromium atoms are
present in one formula unit of
sodium chromate?
Na2CrO4
A. 2 atoms
B.7 atoms
C. 1 atoms
D. 4 atoms
Only 1 atom of chromium is present in one formula unit of sodium chromate (option C).
What is a chemical compound?A chemical compound is a substance formed by the union of two or more chemical elements in a fixed ratio, the union being a chemical bond.
A chemical formula, which is a notation indicating the number of atoms of each element present in a compound, shows the type and number of atoms of elements in a compound.
According to this question, a chemical compound named sodium chromate (Na₂CrO₄) is given. This chemical formula shows that only one atom of chromium is present in the compound.
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Answer:
D. 4 atoms
Explanation:
what is the empirical formula of a compound that contains 60% titanium and 40% oxygen by mass?
The empirical formula of a compound that contains 60% titanium and 40% oxygen by mass is TiO₂.
How to calculate empirical formula?Empirical formula is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.
The empirical formula of a substance can be calculated as follows:
Ti = 60g ÷ 47.87g/mol = 1.25molO = 40g ÷ 16g/mol = 2.5molNext, we divide each mole value by the smallest as follows:
Ti = 1.25mol ÷ 1.25 = 1O = 2.5mol ÷ 1.25 = 2The empirical ratio of Titanium and oxygen is 1:2, hence, the empirical formula is TiO₂.
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a 355-ml can of soda pop contains 41 g of sucrose (c12h22o11). what is the molarity of the solution with respect to sucrose?
A 355-ml can of soda pop contains 41 g of sucrose the molarity of the solution with respect to sucrose is 0.337 M
Given that 41g of sucrose
Number of moles = amount in g/ molar mass
Number of moles= 41 g / 342.2965 g/mol
Number of moles= 0.12 moles Sucrose
Volume = 355 ml or 0.355 L
Thus,
Molarity = 0.12 moles / 0.355 L
Molarity= 0.337 M
The term "molarity of the solution" refers to how many moles of solute there are in a liter of solution. M served as its symbol. The ratio of moles of solutes per liter of solution is known as the molarity of any solution. The following formula captures it.
Molarity (M) = moles of solute/liter of solution
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of the following thermoplastics, the one most widely used for cable jackets is . select one: a. polyvinyl chloride b. polyethylene c. rubber d. crosslinked polyethylene
Polyvinyl chloride (PVC) is mostly used for cable jackets.
PVC cable jackets can withstand heat, sunlight, weathering, oils, acid, and physical abrasion, making them an excellent choice for outdoor cable jackets. It is a thermoplastic material.
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When the kinetic energy of an object changes, there must be some other change in energy at the same time?
When the kinetic energy of an object changes, the motion of that object also changes at the same time.
The amount of energy that a body posses by virtue of its motion is known as Kinetic energy. Therefore, kinetic energy can only be found in objects which are in motion. The amount of Kinetic energy is calculated as follows:
K = 1 /2 mv²
Where, K represents the kinetic energy, m is the mass of the moving object, and v is the velocity or the speed of the object at which it is moving.
If the kinetic energy of the body increases then the motion of the body also increases and if the kinetic energy decreases then the velocity also decreases.
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calculate the pH of 10 g dm-3 HCL
The pH of 10 g dm -3 HCL is 3. The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality.
What is pH ?Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.
Hydrogen potentials are what PH stands for. It speaks of how many hydrogen ions are present in a solution. This serves as a gauge for the acidity or alkalinity of a solution. On a pH scale, the pH value ranges from 0 to 14.
A solution's pH is a significant indicator of its chemical composition. The pH may affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.
[ H⁺ ] = 10 − 3 M,
pH = − log [ 10 − 3 ],
pH = 3.
Thus, The pH of 10 g dm -3 HCL is 3.
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_____ are used for cell phone
communication.
Answer:
Radio Waves are used for cell phone communication.