What does a reaction profile diagram show?

Energy changes during a reaction

Only the temperature of surroundings

Class 9 Chemistry · Chapter 5 · Test 6

Reaction Profiles and Catalysts

25 MCQs covering reaction pathway diagrams, activation energy, exothermic and endothermic profiles, catalysts, reduction of activation energy, catalyzed and uncatalyzed pathways, reaction rates, and examples of catalysts.

MCQs

24 questions · 20 min · 24 marks

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Sample questions

The first 5 of 24. Try each one, then tap to see the answer.

Question 1
What does a reaction profile diagram show?
- AEnergy changes during a reaction
- BOnly the mass of reactants
- COnly the volume of products
- DOnly the temperature of surroundings
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Answer: A
A reaction profile shows the energy changes as a reaction proceeds from reactants to products.
Question 2
What is shown on the vertical axis of a reaction profile?
- AEnergy
- BTime
- CMass
- DVolume
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Answer: A
Energy is normally shown on the vertical axis of a reaction profile.
Question 3
What is shown on the horizontal axis of a reaction profile?
- AReaction coordinate
- BMass
- CTemperature
- DPressure
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Answer: A
The horizontal axis represents the reaction coordinate or progress of the reaction.
Question 4
In an exothermic reaction how is the energy of products related to reactants?
- AProducts have lower energy
- BProducts have higher energy
- CProducts have equal energy
- DProducts have no energy
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Answer: A
Energy is released in an exothermic reaction so the products have lower energy than the reactants.
Question 5
In an endothermic reaction how is the energy of products related to reactants?
- AProducts have lower energy
- BProducts have higher energy
- CProducts have zero energy
- DProducts have equal energy
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Answer: B
Energy is absorbed in an endothermic reaction so the products have higher energy than the reactants.

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