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AP Chem Unit 5 Kinetics Review

Authored by Charlotte Sustersic

Chemistry

University

NGSS covered

Used 14+ times

AP Chem Unit 5 Kinetics Review
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30 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

 A catalyst increases the rate of a chemical reaction by:

Increasing the temperature of the reaction mixture

Providing an alternative reaction pathway with a higher activation energy

Being consumed in the reaction

Lowering the activation energy of the reaction

Answer explanation

It offers an alternative pathway with a lower activation energy - Catalysts typically lower activation energy. Means less energy is needed to react

Tags

NGSS.HS-PS1-4

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The rate of a certain reaction is given by the expression Rate = k[A][B]^2. If the concentration of B is doubled, the rate of the reaction will:

Remain the same

Double

Quadruple

Octuple

Tags

NGSS.HS-PS1-5

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A reaction has a rate constant (k) of 2.5 x 10^-3 s^-1 at 25°C. If the activation energy is 75 kJ/mol, what will be the rate constant at 35°C?

2.5 x 10^-3 s^-1

Greater than 2.5 x 10^-3 s^-1

Less than 2.5 x 10^-3 s^-1

Cannot be determined without additional information

Answer explanation

It will increase - higher temperatures generally increase k, following the Arrhenius equation

Tags

NGSS.HS-PS1-5

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

For the reaction A → B, the rate decreases over time because:

The concentration of A decreases

The concentration of B increases

The activation energy increases

The temperature of the system decreases

Answer explanation

The concentration of A decreases - As reactants are consumed, reaction rates often decrease.

Tags

NGSS.HS-PS1-5

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The half-life of a first-order reaction is independent of:

Temperature

Initial concentration of reactant

Activation energy

Presence of a catalyst

Answer explanation

Initial concentration of reactant - For first-order reactions, half-life is constant.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The mechanism of a reaction is determined by:

The balanced chemical equation

The activation energy

The rate law

The change in enthalpy

Answer explanation

The rate law - Mechanisms explain the steps that constitute the overall rate law.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

For a certain reaction, the activation energy is 56 kJ/mol. If the temperature is increased from 300K to 310K, what will happen to the rate constant (k)?

It will increase

It will decrease

It will remain constant

Cannot be determined without additional information

Answer explanation

It will increase - Higher temperatures generally increase k, following the Arrhenius equation.

Tags

NGSS.HS-PS1-5

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