In an endothermic reaction the products have

the same energy as the reactants

In an exothermic reaction the products have

the same energy as the reactants

activation energy of the forward reaction

potential energy of the reactants

potential energy of the products

potential energy of the activated complex

Activation energy is required to start a chemical reaction. What is activation energy?

The minimum amount of energy required form the activated complex

The maximum amount of energy used

The energy possessed by the products

Which statement is correct?

As E a increases reaction rate decreases

As E a increases reaction rate increases

As E a increases reaction rate stays the same

Which information about a chemical reaction is provided by a potential energy diagram?

the energy released or absorbed during the reaction

the oxidation states of the reactants and products

the average kinetic energy of the reactants and products

the change in solubility of the reacting substances

The chemical reaction between methane and oxygen is represented by the potential energy diagram and balanced equation below. Explain, in terms of collision theory, why a lower concentration of oxygen gas decreases the rate of this reaction.

When the concentration of O 2 (g) DECREASES, there will be fewer molecules available to interact with the CH 4 (g) so the rate of reaction will DECREASE.

When the concentration of O 2 (g) DECREASES, there will be more molecules available to interact with the CH 4 (g) so the rate of reaction will DECREASE.

When the concentration of O 2 (g) DECREASES, the fewer molecules will move faster so the rate of reaction will DECREASE.

When the concentration of O 2 (g) DECREASES, the fewer molecules will move faster so the rate of reaction will INCREASE.

For a chemical reaction, the heat of reaction is equal to the

potential energy of the products minus the potential energy of the reactants

potential energy of the reactants, only

potential energy of the products, only

potential energy of the products plus the potential energy of the reactants

For a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the

activation energy of the forward reaction

How is a chemical reaction affected by the addition of a catalyst?

The activation energy decreases.

The heat of reaction increases.

The number of collisions between particles decreases.

The potential energy of the reactants increases.

Which expression represents the ΔH for a chemical reaction in terms of the potential energy, PE, of its products and reactants?

PE of products – PE of reactants

PE of products + PE of reactants

PE of products × PE of reactants

PE of products ÷ PE of reactants

Kuster ~ K and E ~ Potential Energy Diagrams

Authored by Scott Kuster

Chemistry

9th - 12th Grade

NGSS covered

Used 32+ times

Kuster ~ K and E ~ Potential Energy Diagrams

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What letter represents the energy of the products?

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What type of reaction is this?

Endothermic

Exothermic

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What letter represents the activation energy?

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Is this reaction endothermic or exothermic?

endothermic

exothermic

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the ΔH of this reaction?

40 kJ

20 kJ

80 kJ

60 kJ

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the energy of the activated complex?

75 kJ

225 kJ

300 kJ

225 kJ

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the activation energy of the reverse reaction?

75 kJ

300 kJ

150 kJ

225 kJ

Tags

NGSS.HS-PS1-4

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Kuster ~ K and E ~ Potential Energy Diagrams

What letter represents the energy of the products?

What type of reaction is this?

What letter represents the activation energy?

Is this reaction endothermic or exothermic?

What is the ΔH of this reaction?

What is the energy of the activated complex?

What is the activation energy of the reverse reaction?

How much potential energy do the products of the reverse reaction have?

What letter represents ΔH?

What is the sign of ΔH for all endothermic reactions?

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