AP Chemistry Unit 5 (5.1-5.6) Review

Which of the following best describes the rate of a chemical reaction?

• The time it takes for the reaction to start.

• The change in temperature of the reaction mixture over time.

• The change in concentration of reactants or products per unit time.

• The amount of product formed at equilibrium.

Tags

NGSS.HS-PS1-5

Increasing the temperature of a reaction typically increases the reaction rate because:

• It lowers the activation energy of the reaction.

• It increases the frequency of collisions between molecules.

• It increases the energy of collisions between molecules.

• Both B and C.

Tags

NGSS.HS-PS1-5

What is the rate law for the reaction A+B→CA + B \to C, if experimental data shows that doubling [A] doubles the rate, and doubling [B] quadruples the rate?

• Rate=k[A][B]\text{Rate} = k[A][B]

• Rate=k[A]^2[B]\text{Rate} = k[A]^2[B]

• Rate=k[A][B]^2\text{Rate} = k[A][B]^2

• Rate=k[A]^2[B]^2\text{Rate} = k[A]^2[B]^2

Tags

NGSS.HS-PS1-5

The units of the rate constant (k) for a second-order reaction are:

• mol/L \cdot \text{s}

• L/mol \cdot \text{s}

• s^{-1}\text{s}^{-1}

• L2/mol2 \cdot \text{mol}^2 \cdot \text{s}

Tags

NGSS.HS-PS1-5

Which of the following is NOT a factor that affects the rate of a chemical reaction?

• Concentration of reactants

• Temperature

• Presence of a catalyst

• Color of reactants

Tags

NGSS.HS-PS1-5

What is the molecularity of the elementary reaction 2A→B+C2A \to B + C?

• Unimolecular

• Bimolecular

• Termolecular

• Tetramolecular

For a multi-step reaction, the overall reaction rate is determined by:

• The fastest step.

• The step with the smallest activation energy.

• The step with the highest energy transition state.

• The slowest step.

Tags

NGSS.HS-PS1-5

According to the collision model, which two factors are necessary for an effective collision?

• Proper orientation and sufficient energy.

• High pressure and low temperature.

• Low activation energy and high catalyst concentration.

• Large surface area and high concentration.

A catalyst increases the rate of a reaction by:

• Increasing the concentration of reactants.

• Lowering the activation energy.

• Raising the temperature.

• Changing the reaction order.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

In the reaction energy diagram below, what does the peak represent?

• The activation energy.

• The transition state.

• The energy of the products.

• The energy of the reactants.

Tags

NGSS.HS-PS1-4