What is activation energy?

Energy required to convert reactants into the transition state

Energy stored only in catalysts

What is the transition state?

A high energy state between reactants and products

How does a chemical reaction generally begin at the molecular level?

By collisions between reactant molecules

What is a successful collision?

A collision that produces products

A collision between products only

A collision that always stops the reaction

Class 9 Chemistry · Chapter 5 · Test 5

Activation Energy

25 MCQs covering activation energy, transition state, molecular collisions, successful collisions, energy of reactants and products, reaction pathways, and the factors that allow chemical reactions to occur.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
What is activation energy?
- AEnergy required to convert reactants into the transition state
- BEnergy released by products
- CTotal energy of products
- DEnergy stored only in catalysts
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Answer: A
Activation energy is the energy required by reactant molecules to reach the transition state.
Question 2
What symbol is commonly used for activation energy?
- AEa
- BEH
- CEp
- DEr
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Answer: A
Ea is commonly used to represent activation energy.
Question 3
What is the transition state?
- AA high energy state between reactants and products
- BA stable final product
- CA type of catalyst
- DA low energy reactant
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Answer: A
The transition state is a high energy state through which reactants pass before forming products.
Question 4
How does a chemical reaction generally begin at the molecular level?
- ABy collisions between reactant molecules
- BBy freezing reactants
- CBy removing all energy
- DBy separating all molecules
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Answer: A
Reactant molecules must collide for a chemical reaction to occur.
Question 5
What is a successful collision?
- AA collision that produces products
- BA collision with no energy
- CA collision between products only
- DA collision that always stops the reaction
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Answer: A
A successful collision has the required energy and suitable conditions to lead to product formation.

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