A reactant reaches the transition state

when there is an input of energy to initiate the reaction

when it is ready to receive energy

Given the potential energy diagram for the chemical reaction: Which statement correctly describes the energy changes that occur in the forward reaction

The activation energy is 10kJ and the reaction is exothermic

The activation energy is 50kJ and the reaction is exothermic

The activation energy is 50kJ and the reaction is endothermic

The activation energy is 10kJ and the reaction is endothermic

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

Red, because the activation energy is larger

Blue, because the activation energy is lower

Neither, as the activation energy is the same

Neither, as the activation energy does not affect reaction rate

The graph shows a typical Maxwell-Boltzmann energy distribution for particles of an ideal gas in a sealed container at a fixed temperature. Which of the following statements is true?

The area under the curve to the right of E A represents the number of molecules with enough energy to react.

Position A represents the highest energy of a molecule in the container.

Addition of a catalyst moves the position of E A to the right.

The position of the peak of the curve at a higher temperature is further away from both axes.

Consider a reaction mixture consisting of 1 mol of gaseous iodine and 1 mol of hydrogen at 200 °C. The experiment is then repeated at 300 °C. Which of the following statements is consistent with comparisons between the Maxwell-Boltzmann distributions for this reaction mixture at these two temperatures?

The peak of the curve flattens and the curve extends towards higher energies for the reaction at 300 °C.

The area under the curve is greater for the reaction at 300 °C.

The area under the curve is smaller for the reaction at 200 °C.

The peak of the curve becomes sharper and the curve retreats towards lower energies for the reaction at 300 °C.

The diagram represents the Maxwell‒Boltzmann energy distribution curve of the reactants for a chemical reaction with different activation energies, E a1 and E a2 . Explain why the reaction rate of E a2 is faster?

More frequent collisions between the particles occur.

More energetic collisions between the particles occur.

At the higher temperature, 2000 o C, the curve is shifted to the right. Which of the following is true ?

the fraction of molecules with energy > E a increases

the fraction of molecules with energy > E a decreases

there are more particles under the curve

there are less particles under the curve

A solution of hydrogen peroxide releases oxygen slowly at room temperature. hydrogen peroxide → water + oxygen The diagrams show the effect of adding blood to the solution. What could be the reason for the observed change?

The hydrogen peroxide becomes more concentrated.

The hydrogen peroxide is neutralised by blood.

Which of the following is NOT TRUE of an activated complex?

exact structures of all activated complexes can be determined

exists momentarily at the peak of the activation energy barrier

highly energetic species represented by the peak of an energy profile diagram

What is a homogeneous catalyst?

A catalyst the same phase as the reactants

A catalyst a different phase than the reactants

A catalyst in one physical state

A catalyst in two different physical states

Only a small amount of enzyme is needed for a large amount of substrate because _______

Enzymes do not change at the end of a reaction and as such can be reused

A small amount of enzyme can provide enough energy to continue the reaction

More enzymes are formed while reaction takes place

Enzymes act till completion of a reaction or not at all

AP Chemistry Energy Profile

Authored by Charles Martinez

Chemistry

11th - 12th Grade

NGSS covered

Used 1+ times

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32 questions

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What type of reaction is shown in the reaction pathway?

endothermic reaction

exothermic reaction

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 5 pts

B represents

energy absorbed

energy released

activation energy (forward reaction)

activation energy (backwards reaction)

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

MULTIPLE CHOICE QUESTION

1 min • 5 pts

What is the activation energy?

The minimum kinetic energy of the products

The energy of the reactants

The minimum kinetic energy needed by colliding reactants to form the products

The energy lost in the reaction as particles collide to form the products

MULTIPLE CHOICE QUESTION

1 min • 1 pt

True or False:
The magnitude of E_a is related to the strength and number of existing bonds in reactants

True

False

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Shown are the energy profiles of two reactions.
The reaction with the lowest activation energy is

A + B → C + D

X → Y + Z

C + D → A + B

Z + Y → X

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following are true when a catalyst is used in a chemical reaction?

Enthalpy of reaction is lower.
Activation energy for the reaction is lower.

Enthalpy of reaction is same.
Activation energy for the reaction is lower.

Enthalpy of reaction is the lower.
Activation energy for the reaction is same.

Enthalpy of the reaction is same.
Activation energy for the reaction is same.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following best explains how a catalyst increases the rate of reaction?

a catalyst provides an alternative pathway of lower activation energy, thus increases the proportion of effective collisions

a catalyst provides an alternative pathway of higher activation energy, thus increases the proportion of effective collisions

a catalyst provides an alternative pathway of lower activation energy for the forward reaction only

a catalyst provides an alternative pathway of lower activation energy for the back reaction only

Tags

NGSS.HS-PS1-5

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AP Chemistry Energy Profile

What type of reaction is shown in the reaction pathway?

B represents

What is the activation energy?

True or False:The magnitude of Ea is related to the strength and number of existing bonds in reactants

Shown are the energy profiles of two reactions.The reaction with the lowest activation energy is

Which of the following are true when a catalyst is used in a chemical reaction?

Which of the following best explains how a catalyst increases the rate of reaction?

What letter represents the activation energy?

What is the activation energy?

A reactant reaches the transition state

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Popular Resources on Wayground

Discover more resources for Chemistry

True or False:
The magnitude of E_a is related to the strength and number of existing bonds in reactants

Shown are the energy profiles of two reactions.
The reaction with the lowest activation energy is