I have 2 samples of solid chalk (aka calcium carbonate). Sample A has a total mass of 4.12 g and Sample B has a total mass of 19.37 g. What is the difference between the samples?
A) Sample B has more calcium carbonate molecules
B) Sample B has a larger ratio of carbon, oxygen, and calcium atoms
C) Sample B has more calcium ion than carbonate ions
D) Sample B must have some impurity
Answers
Answer:
A) Sample B has more calcium carbonate molecules
Explanation:
M = Molar mass of calcium carbonate = 100.0869 g/mol
\(N_A\) = Avogadro's number = \(6.022\times 10^{23}\ \text{mol}^{-1}\)
For the 4.12 g sample
Moles of a substance is given by
\(n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{4.12}{100.0869}\\\Rightarrow n=0.0411\ \text{mol}\)
Number of molecules is given by
\(nN_A=0.0411\times 6.022\times 10^{23}=2.48\times 10^{22}\ \text{molecules}\)
For the 19.37 g sample
\(n=\dfrac{19.37}{100.0869}\\\Rightarrow n=0.193\ \text{mol}\)
Number of molecules is given by
\(nN_A=0.193\times 6.022\times 10^{23}=1.16\times 10^{23}\ \text{molecules}\)
\(1.16\times 10^{23}\ \text{molecules}>2.48\times 10^{22}\ \text{molecules}\)
So, sample B has more calcium carbonate molecules.
The ratio of the elements of carbon, oxygen, calcium atoms, ions, has to be same in both the samples otherwise the samples cannot be considered as calcium carbonate. Same is applicable for impurities. If there are impurites then the sample cannot be considered as calcium carbonate.
Related Questions
Science has had no negative impacts on society. Please select the best answer from the choices provided T F
Answers
Answer:
false
Explanation:
not all science is good, or has good effects
False.
Science can possibly be dangerous when used by the wrong people. It can be used to create bombs, bioweapons, and much more.
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Most organic compounds are made of just four elements.
What are they?
Answers
Answer:
hydrogen, carbon, oxygen and nitrogen
Explanation:
Most organic compounds are made up of the four elements: hydrogen, carbon, oxygen and nitrogen.
Most organic compounds are made of just four elements are hydrogen, carbon, oxygen and nitrogen.
What do you mean by an organic compound ?The term organic compound is defined as a substance that contains covalently - bonded carbon and hydrogen and often with other elements.
Benzoic acid, aromatic compounds, benzoic aldehyde, propanoic acid, butanoic acid, malonic acid, amines, heterocyclic compounds, VOC, benzoic acid, and diethyl malonate are some examples of organic compounds.
Carbohydrates, lipids, proteins, and nucleotides are all organic compounds that are required for human function. Because they contain both carbon and hydrogen, these compounds are classified as organic.
Thus, Most organic compounds are made of just four elements are hydrogen, carbon, oxygen and nitrogen.
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A 22.6 gram sample of krypton gas has a volume of 904 milliliters at a pressure of 2.71 atm. The temperature of the Kr gas sample is:_____
Answers
Answer:
110.78 K
Explanation:
First we convert 22.6 g of krypton gas (Kr) to moles, using its molar mass:
22.6 g Kr ÷ 83.798 g/mol = 0.270 mol KrThen we use the PV=nRT formula, where:
P = 2.71 atmV = 904 mL ⇒ 904/1000 = 0.904 Ln = 0.270 molR = 0.082 atm·L·mol⁻¹·K⁻¹T = ?2.71 atm * 0.904 L = 0.270 mol * 0.082 atm·L·mol⁻¹·K⁻¹ * T
And solve for T:
T = 110.78 KMetal is malleable. This means
Question 8 options:
Its magnetic.
It can be pulled into wire.
It can be rolled or hammered into flat sheets.
It can transmit heat.
Answers
How does a wave get taller as
it gets closer to shore?
A. The wind blows harder making the wave
get faster.
B. The shallow water at the bottom of the
wave makes the wave length smaller.
C. The wind blows harder making the wave
slow.
D. The deeper water at the bottom of the
wave makes the wave get faster.
Answers
The reason why a wave get taller as it gets closer to shore is that the shallow water at the bottom of the wave makes the wave length smaller. Option B
What is a wave?A wave is a disturbance that occurs along a medium which transmits energy. Now we now that waves travel from place to place. The horizontal distance that is travelled by a wave is what we call the wavelength of the wave.
As the wave approaches the shore, the wave tends to slow down because it is dragged from beneath. In the process, the wave grows taller. Thus, the reason why a wave get taller as it gets closer to shore is that the shallow water at the bottom of the wave makes the wave length smaller. Option B
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A student has a sample of 1.24 moles of fluorine gas that is contained in a 21.5 L container at 284 K. What is the pressure of the sample? The ideal gas constant is 0.0821 L*atm/mol*K. Round your answer to the nearest 0.01 and include units.
Answers
Answer:
The pressure of the sample is 1.18atm.
Explanation:
1st) The given information from the exercise is:
- Number of moles (n): 1.24moles
- Volume (V): 24.5L
- Temperature (T): 284K
- Ideal gas constant: 0.0821 atm*L/mol*K
2nd) With the Ideal Gases formula, we can replace the values of n, V and T to calculate the pressure of the sample:
\(\begin{gathered} P*V=n*R*T \\ P*24.5L=1.24mol*0.0821\frac{atm*L}{mol*K}*284K \\ P*24.5L=28.91atm*L \\ P=\frac{28.91atm*L}{24.5L} \\ P=1.18atm \end{gathered}\)So, the pressure of the sample is 1.18atm.
Tin(IV) sulfide, SnS2, a yellow pigment, can be produced using the following reaction.
SnBr4(aq)+2Na2S(aq)⟶4NaBr(aq)+SnS2(s)
Suppose a student adds 45.0 mL of a 0.605 M solution of SnBr4 to 53.8 mL of a 0.181 M solution of Na2S.
Identify the limiting reactant.
1) Na2S
2) NaBr
3) SnBr4
4) SnS2
Calculate the theretical yield of SnS2.
Answers
The limiting reactant is Na₂S and the theoretical yield of SnS₂ is 60.9%.
Moles of SnBr₄ = Molarity × volume (L)
= 0.605 mol/lit × 0.045 lit
= 0.02722 mole
Moles a Na₂S. = Molarity x volume (L).
= 0.181 mol/lit X 00538 (lit)
= 0.00973 mol
From the balanced chemical equation.
I mole of SnBr₄ = 2 mole of Na₂S
Multiply by 0.02722
0.02722 mole SnBr₄ = 2 x 0.02722 mol Na₂S.
Moles Na₂S required = 0.0544 mol
Moles of Na₂S Present = 0.00973 mol
Hence the limiting reactant is Na₂S.
2 Mole of Na₂S = 1 mole of SnS₂
1 Mole of Na₂S = 1/2 mole of SnS₂
multiply by 0.00973
0.00973 mol Na₂S = 0.009731 mol × 1/2 mol SnS₂
mole of SnS₂ = 0.004865 mol·
Gram of SnS₂ = No of moles x Molar mass
= 0.004865m × 182.89 g/mol
= 0.889 g
Percent. yield = Practical field / Theoretical yield × 100
= (0.541)/(0.889) × 100
= 60.85%
= 60.9%
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Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?
Answers
Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.
As a result, the ice undergoes a phase change, from a solid to a liquid. This process is called melting. During melting, the temperature of the ice remains constant at 0°C because all the heat energy is used up in overcoming the intermolecular forces of attraction.The energy required to melt ice is known as the heat of fusion. The heat of fusion is the amount of heat energy required to change 1 kilogram of a solid into a liquid at its melting point. For water, the heat of fusion is 334 kJ/kg. This means that 334 kJ of heat energy is required to melt 1 kg of ice at 0°C. Therefore, during the melting of ice, the temperature of the ice does not change, but the internal energy of the ice does change, and this is manifested in the change of phase from a solid to a liquid.In summary, when heat is added to ice at 0°C, the temperature of the ice does not change, and all the heat energy is used up in overcoming the intermolecular forces of attraction between the water molecules in ice. This results in the melting of ice without any change in temperature.For such more question on molecules
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why can a solution be classified as a mixture
Answers
How many grams of CO2,(g) would be found in a 5.6 L container at 23oC that has a pressure of 760 mm Hg?
Answers
Answer:
Mass = 10.12 g
Explanation:
Given data:
Volume of CO₂ = 5.6 L
Pressure = 760 mmHg
Temperature = 23°C
Mass of CO₂ = ?
Solution:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
23+273 = 296 K
760/760 = 1 atm
1 atm × 5.6 L = n × 0.0821 atm.L/ mol.K × 296K
5.6 atm.L = n × 24.30 atm.L/ mol
n = 5.6 atm.L / 24.30 atm.L/ mol
n = 0.23 mol
Mass of CO₂:
Mass = number of moles × molar mass
Mass = 0.23 mol × 44 g/mol
Mass = 10.12 g
You have 723 ml of 3.99 M HCl. Using a volumetric pipet, you take 326 ml of that solution and dilute it to 976 ml in a volumetric flask. Now you take 100.00 ml of that solution and dilute it to 119 ml in a volumetric flask. What is the concentration of hydrochloric acid in the final solution
Answers
Answer:
1.12M
Explanation:
The initial concentration of the HCl solution is 3.99M. You are doing 2 dilutions:
In the first you take 326mL and dilute the solution to 976mL; that means you are diluting the solution:
976mL / 326mL = 2.99 times.
The concentration of this solution is:
3.99M / 2.99 = 1.33M
Now, in the second dilution, you take 100mL of the diluted solution and dilute it to 119mL. The concentration of this final solution is:
119mL / 100mL = 1.19 times.
1.33M / 1.19 =
1.12MThe final concentration of hydrochloric acid present is 1.11 M.
In the first dilution;M1V1 = M2V2
M2 = 3.99 M × 326 ml/976 ml
M2 = 1.33 M
In the second dilution:
M1V1 = M2V2
M2 = 1.33 M × 100.00 ml/119 ml
M2 = 1.11 M
Hence, the final concentration of hydrochloric acid present is 1.11 M.
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What products are formed during the electrolysis of a concentrated aqueous solution of CrI3?
Answers
Lab 2: paper chromatography of organic dyes
Picture of questions below.
Answers
Answer:
The three primary colors used when mixing dyes or paints are red, yellow, and blue. Other colors are often a mixture of these three colors. Try running a chromatography test again with non-primary-color markers, like purple, brown, and orange.
Explanation:
Mixtures that are suitable for separation by chromatography include inks, dyes and colouring agents in food. ... As the solvent soaks up the paper, it carries the mixtures with it. Different components of the mixture will move at different rates. This separates the mixture out.
if a reaction occurs, what will be the products of the unbalanced reaction below?Zn(s) + HCl(aq) -->
Answers
The following reaction, is a type of reaction called Single Replacement reaction, where we have two elements switching places and forming a new compound, the full reaction is:
Zn + 2 HCl -> ZnCl2 + H2
Now the reaction is completed and balanced
Explain why carbon dioxide is a gas, water
is a liquid, and salt is solid at room temperature based on how the particles
are held together.
Answers
Answer:
Carbon dioxide is a gas because the particles surrounding it are more spread out and free from each other. Water is a liquid because the particles are partially spread out and have a medium space to move around. And due to the room temperature, salt's particles can either be hot and move rapidly, or be cold and not move rapidly.
Explanation:
If an astronaut holds a 5-kg ball 2 meters (m) above the ground on the Moon, does it have the same potential energy it did when the astronaut held that ball 2 m above the ground on Earth? Explain your reasoning
Answers
The potential energy of the object is not the same on earth and moon because of varying acceleration due to gravity.
The given parameters;
mass of the object, m = 5 kgheight, h = 2 macceleration due to gravity on earth, g = 9.8 m/s²acceleration due to gravity on moon, g = 1.6 m/s²The potential energy of the object on earth is calculated as follows;
P.E = mgh
P.E = 5 x 9.8 x 2
P.E = 98 J
The potential energy of the object on moon is calculated as follows;
P.E = 5 x 1.6 x 2
P.E = 16 J
Thus, we can conclude that the potential energy of the object is not the same on earth and moon because of varying acceleration due to gravity.
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Which term correctly describes the phenomenon that causes the difference in precipitation at Mt. Charleston and Las Vegas?
Question 3 options:
Rain Shadow Effect
Ocean Currents
Albedo Effect
Global Climate
Answers
Answer:
The rain shadow effect
Explanation:
A rain shadow is an area of land that was forced to become a desert because a mountain or mountain range blocked all the necessary weather for plants to grow... after the air crosses over the mountains peak and begins going down the other side, the air warms up which means there's less rainfall.
what happens when the gas produced by heating chloroform with silver powder is passed into Ammoniacal silver nitrate solution
Answers
Explanation:
Chloroform and silver powder react with each other and exchange the ions with each other to form acetylene molecules which are also called ethyne and silver chloride. The molecule C2H2is called acetylene which is a colourless gas with no odour.
Answer:
2CHCl3+6Ag−→ΔC2H2+6AgCl
Note: The Ag powder is synthesized by reducing silver nitrate with glycerol and here glycerol acts as the solvent for the reaction. The above given reaction can be proceeded with tribromomethane (bromoform) or triiodomethane (iodoform) since the structure of iodoform and bromoform resembles chloroform.
At first glance, we expect the Zeff of sodium (Z = 11) to be _____, but in reality, it is closer to 2.667 because _____.
Answers
This problem is asking for the theoretical effective nuclear charge for sodium and a reason behind its difference with the actual one. At the end, the answers are 1+ and because the 3s¹ electron has a small probability of being closer to the nucleus.
Effective nuclear chargesIn chemistry, the effective nuclear charge is defined as the net positive charge valence electrons experience. In addition, one can approximate it with the equation:
Zeff = Z – S
Where Z is the atomic number or number of electrons and S the core electrons.
In such a way, since sodium has 11 electrons and 10 core electrons due to its electron configuration (1s²2s²2p⁶3s¹), one concludes its effective nuclear charge is:
Zeff = 11 - 10 = +1
On the other hand, since the actual effective nuclear charge has a value of about 2.667, one concludes this difference is due to the fact that the 3s¹ electron has a small tendency of being closer to the nucleus and therefore, there is a likelihood that this electron undergoes a greater attraction in comparison to the proposed in the theoretical model.
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Answer:
At first glance, we expect the Zeff of sodium (Z = 11) to be 1 , but in reality, it is closer to 2.667 because the assumptions that 1) core electrons block protons 1 for 1 and 2) valence electrons don't block at all are not completely valid..
Explanation:
At first glance, we expect the Z_eff of sodium (Z = 11) to be 1, but in reality, it is closer to 2.667 because the assumptions that core electrons shield protons 1 for 1 and valence electrons do not shield are not completely valid.
In the case of sodium (Na) atom, a valence electron is presenting 3s-orbital and the total number of shielding electrons is 10. Thus, the expected Ze must be equal to 1. The net charge (an effective nuclear charge (Z_eff) is a charge that experience by a valence electron which not only depends upon the charge on the nucleus but also the screening effect of the inner electron
Ethylene is the organic compound produced in the highest quantities around the world with annual production exceeding 100 million tons.
a. True
b. False
Answers
Answer: True
Explanation:
Ethylene, C2H4, is a simple alkene. It is an organic compound that's being produced on a very large scale. It is made up of a double bond.
.
It has a yearly worldwide production capacity of more than one hundred million tons, and this makes it the largest volume of organic compound in the world. Most of ethylene is used in the production of polyethylene.
Therefore, the above statement is true
Consider the heating curve for water.
Heating Curve for Water
160
140
120
100
80
60
40
20
Temperature (°C)
-20
1 2 3 4 5 6 7 8 9 10
Time (min)
At what temperature does the solid start melting?
Answers
The solid starts melting at 0°C. The heating curve for water shows the temperature changes as heat is added to the substance.
The horizontal flat line on the graph represents the phase change from solid to liquid. In the case of water, this occurs at 0°C. This is known as the melting point, or the temperature at which a substance changes from a solid to a liquid at atmospheric pressure.
It is an important characteristic of a substance and can be used to identify it. It is also important in many industrial processes, such as melting metals for casting. Therefore, understanding the melting point of a substance is crucial in various fields of science and technology.
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Choose the group that corresponds to each element.
Alkali Metal
Alkali earth metal
Halogen
Noble gas
Answers
The group corresponding to alkali metal, alkali earth metal, halogen, and noble gas is IA,IIA, 17, 18 group respectively.
Alkali metals have one outermost electron in their valence shell. They are kept under oil and are in the group IA of the periodic table.Alkaline earth metals have two outermost electrons in their valence shell. Examples are beryllium, magnesium, etc.Halogens have seven electrons in their outermost shells. They are in the periodic table in group 17 naming fluorine to iodine.Noble gas is the one that has fulfilled electronic configuration and doesn't react with any other compound.This is present in group 18 of periodic table.Learn more about alkali metals at:
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A 1.00 M sample HI is placed in a 1-L vessel at 460°C, and the reaction system is allowed to come
to equilibrium. The Hl partially decomposes, forming Hz and I2. What is the equilibrium
concentration of HI if the equilibrium constant is 52.8?
H2(g) + 12(g) = 2 HI(g) at 460°C?
Answers
Answer:
[HI] = 0.784M
[I₂] = 0.108M
[H₂] = 0.108M
Explanation:
Based on the equilibrium reaction:
H₂(g) + I₂(g) ⇄ 2HI(g)
The equilibrium constant, K, is:
K = 52.8 = [HI]² / [H₂] [I₂]
Where [] are equilibrium concentrations of each gas.
As initial concentration of HI is 1.00M, the equilibrium concentrations of the gases is:
[HI] = 1.00M - 2X
[I₂] = X
[H₂] = X
Replacing:
52.8 = [1.00-2X]² / [X] [X]
52.8X² = 4X² - 4X + 1
0 = -48.8X² - 4X + 1
Solving for X:
X = -0.1899M. False solution, there is no negative concentrations
X = 0.108M. Right solution.
Replacing, equilibrium concentrations are:
[HI] = 1.00M - 2*0.108M
[HI] = 0.784M[I₂] = 0.108M[H₂] = 0.108Msdfsdfsdfsfsdfsdfdfdre
Answers
Answer:
310 mmHg
Explanation:
All you have to do here in order to figure out the pressure exerted by gas
D is use Dalton's Law of Partial Pressures.
what is a physical change
Answers
cutting a piece of paper
Explanation:
Answer:
A physical change occurs when a substance changes, but no new substance is formed.
Explanation:
Identify the item that does not have kinetic energy.
A. A worm crawling
B. A falling leaf
C. An airplane flying
D. A butterfly sitting on a twig
Answers
Answer:
D
Explanation:
there is no other answer choice that does not move. This is a fool-proof question because all the other answer choices contain movement except the butterfly resting
If a material is ductile, it is mostly likely a
nonmetal
metal
metalloid
Gas
Answers
Answer:
Explanation:
Which of the following is most likely to be ductile?
a. Metal
b. Nonmetal
c. Metalloid
d. Gas
Answer: a. MetalMetal
Calculate the concentration in mol/L, M, of an aqueous sugar solution with a concUsing the above equation, how many grams of salt ( CaCl2 ) would need to be added to 1 L of water in order for the boiling point of the solution to reach 106 °C ? Assume that the density of water is 1.0 g/mL and that CaCl2 completely dissociates into three ions — i.e., a Ca2+ ion and two Cl− ions. The boiling point constant, kb , for water is 0.515°C/m .entration of 17.0% (w/w) and density of 1.015 g/mL at 25°C . The molecular weight of sugar is 342.30 g/mol. Report your answer to three significant figures.
Answers
The molar mass of the sugar is obtained as 1.43 g/mol.
What is the molecular mass?We know that the boiling point of a substance is one of the properties of the substances that could be called the colligative properties since they can be affected by the number of particles present.
We are told that the mass concentration of the substances w/w of the solution is 17% thus we have 17 g of the compound and 83 g of water. We can now get the number of moles of the substance as;
Number of moles = ?
Mass of the solution = 1000 mL * 1.015 g/mL = 1015 g or 1.015 Kg
Given that;
ΔT = K m i
ΔT = Boiling point elevation
K = Boing constant of water
m = molality of the solution
i = Van't Hoff factor
ΔT = 106 °C - 100°C
= 6 °C
Then;
6 = 0.515 * 17/MM * 1/1.015 * 1
Where MM = molar mass of the sugar
6 = 0.515 * 17/1.015 MM * 1
6 = 0.515 * 17/1.015 MM
6 = 8.755/1.015 MM
6 * 1.015 MM = 8.755
MM = 8.755/6 * 1.015
MM = 1.43 g/mol
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Which characteristic of an outermost shell is required for an atom to not need any electrons?
1 electron
more than 2 electrons
more than 21 electrons
a full
Answers
Answer:
A full.
Explanation:
An electron needs to have a full octet do not need any more electrons. So the correct option is D.
What is a valence shell?
The s and p electrons in the outermost shell are valence electrons. Core electrons are those found in the inner shell. Valence electrons are little subatomic particles that we come across as we examine and investigate an element's atom. We can trace the valence electrons and forecast the sorts of bonds with the aid of Lewis structures.
The majority of valence electrons are negatively charged particles, and they are all grouped in various orbitals or shells. Additionally, these electrons are in charge of how atoms interact with one another and create chemical bonds.
However, not every electron belongs to an atom. A chemical bond or molecule can only be created by the electrons that are found in the outermost shell. Valence electrons are the name given to this sort of electron.
Therefore the correct option is D.
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How would the number of oxygen atoms in a 16.00 pound sample compare to the number of sulfur atoms in a 32 pound sample?