Q: Which equation is used to calculate the concentration of a solution in molarity?

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

Question 1

Which statement best describes the kinetic molecular theory of gases?

Accepted Answer

Gas particles are in constant, random motion and collisions between them are perfectly elastic.

Question 2

Which of the following is NOT a unit commonly used to measure pressure of gases?

Accepted Answer

J

Question 3

A sample of gas occupies 2.0 L at 1.0 atm. If the pressure is increased to 2.0 atm at constant temperature, what will be the new volume? (Use Boyle's Law: $$P_1V_1 = P_2V_2)$$

Accepted Answer

1.0 L

Question 4

Which factor does NOT affect the rate of a chemical reaction according to Collision Theory?

Accepted Answer

Color of reactants

Question 5

Which of the following is a strong electrolyte?

Accepted Answer

NaCl (aq)

Question 6

A solution is prepared by dissolving 10 g of NaCl in 100 g of water. Identify the solute and solvent.

Accepted Answer

Solute: NaCl; Solvent: Water

Question 7

Which equation is used to calculate the concentration of a solution in molarity?

Accepted Answer

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

Question 8

If 0.5 mol of HCl reacts with NaOH in a neutralization reaction, how many moles of NaOH are required for complete reaction?

Accepted Answer

0.5 mol

Question 9

Which statement about equilibrium is correct?

Accepted Answer

At equilibrium, the rates of the forward and reverse reactions are equal.

Question 10

Given the equilibrium constant $$K_c = \frac{[C][D]}{[A][B]}$$ for the reaction $$A + B \rightleftharpoons C + D$$, what happens to the value of $$K_c if $$the concentrations of all species are doubled?

Accepted Answer

The value of $$K_c$$ remains unchanged.

Question 11

A reaction has $$K_c = 1 	imes 10^5$. Which statement best describes the equilibrium mixture?

Accepted Answer

Products are favored over reactants.

Question 12

Which of the following changes will increase the rate of a reaction according to Collision Theory?

Accepted Answer

Increasing the temperature

Question 13

If a saturated solution of NaCl is diluted with water, what happens to its concentration?

Accepted Answer

The concentration decreases.

Question 14

Which of the following best describes Le Châtelier's Principle?

Accepted Answer

If a system at equilibrium is disturbed, the system will shift to counteract the disturbance.

Question 15

A solution contains 0.2 mol of solute in 0.5 L of solution. What is its molarity?

Accepted Answer

$$0.4\ 	ext{M}$$

Question 16

Which of the following is the correct formula for the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 17

Which change will shift the equilibrium of the reaction $$N_2(g) + 3H_2(g$$) \rightleftharpoons 2NH_3(g)$$ to the right?

Accepted Answer

Increasing the pressure

Question 18

Which type of solid is $$K_2SO_4$$ classified as?

Accepted Answer

Ionic solid

Question 19

A chemical reaction is performed at room temperature and then at a higher temperature. What is the expected effect on the rate of reaction?

Accepted Answer

The rate increases due to more frequent and energetic collisions.

Question 20

A solution is prepared by mixing 0.1 mol of $$KNO_3 in 250 mL of $$water. What is the molarity of the solution?

Accepted Answer

$$0.4\ 	ext{M}$$

Study Guide: Gases, Solutions, and Chemical Equilibrium (Chapters 11-13)

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