Q: Which of the following is the correct formula for calculating molarity ($M$)?

$M = \dfrac{\text{moles of solute}}{\text{liters of solution}}$

Q: Which of the following is the correct expression for the ideal gas law constant $R$ in SI units?

$8.314 \text{ J mol}^{-1} \text{K}^{-1}$

Question 1

Which of the following statements best describes the Law of Conservation of Mass as it applies to a chemical reaction?

Accepted Answer

The total mass of the reactants and products remains constant throughout the reaction.

Question 2

A sample contains 3.00 moles of oxygen atoms. How many atoms are present in the sample?

Accepted Answer

$1.81 	imes 10^{24}$ atoms

Question 3

Which of the following is the correct empirical formula for a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$CH_2O$

Question 4

A student mixes solutions of silver nitrate and sodium chloride. A white precipitate forms. Which type of chemical reaction has occurred?

Accepted Answer

Double displacement

Question 5

What is the oxidation number of manganese in $KMnO_4$?

Accepted Answer

+7

Question 6

Which of the following best describes the limiting reactant in a chemical reaction?

Accepted Answer

The reactant that determines the amount of product formed.

Question 7

A reaction has a theoretical yield of 10.0 g and an actual yield of 7.5 g. What is the percent yield?

Accepted Answer

$75\%$

Question 8

Which of the following equations correctly relates pressure, volume, and temperature for an ideal gas?

Accepted Answer

$PV = nRT$

Question 9

Which statement about enthalpy ($\Delta H$) is correct?

Accepted Answer

Enthalpy change is always negative for exothermic reactions.

Question 10

A balloon contains 2.00 L of gas at 1.00 atm and 300 K. If the temperature increases to 400 K at constant pressure, what is the new volume?

Accepted Answer

$2.67$ L

Question 11

Which of the following is a correct statement about the solubility of ionic compounds in water?

Accepted Answer

Solubility depends on the balance between lattice energy and hydration energy.

Question 12

Which of the following is the correct net ionic equation for the reaction between $AgNO_3$ and $NaCl$ in aqueous solution?

Accepted Answer

$Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)$

Question 13

Which of the following best explains why ice floats on water?

Accepted Answer

Ice is less dense than liquid water because of hydrogen bonding creating an open lattice structure.

Question 14

Which of the following is the correct formula for calculating molarity ($M$)?

Accepted Answer

$M = \dfrac{	ext{moles of solute}}{	ext{liters of solution}}$

Question 15

A compound contains only carbon, hydrogen, and oxygen. Combustion of 0.100 g of the compound produces 0.200 g $CO_2$ and 0.082 g $H_2O$. What is the mass percent of carbon in the compound?

Accepted Answer

$54.6\%$

Question 16

Which of the following is the correct balanced equation for the combustion of propane ($C_3H_8$)?

Accepted Answer

$C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O$

Question 17

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons and reduction is the gain of electrons.

Question 18

Which of the following is the correct expression for the ideal gas law constant $R$ in SI units?

Accepted Answer

$8.314 	ext{ J mol}^{-1} 	ext{K}^{-1}$

Question 19

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms from two aqueous solutions.

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