Question detail

For Reaction profiles, which answer best supports this AQA GCSE Chemistry Unit 4.5 objective: Explain that chemical reactions occur only when reacting particles collide?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Exothermic and endothermic reactions

Question

A. that: correct Unit 4.5 answer for Reaction profiles
B. Incorrect: confuses that with a nearby Energy changes idea
C. Incorrect: gives a general chemistry statement without linking to Reaction profiles
D. Incorrect: reverses the energy-change relationship in Exothermic and endothermic reactions

Answer

The correct option is that: correct Unit 4.5 answer for Reaction profiles.

Explanation

The correct option is that: correct Unit 4.5 answer for Reaction profiles. It directly supports the approved learning objective to explain that chemical reactions occur only when reacting particles collide. This keeps the answer anchored to Reaction profiles within Exothermic and endothermic reactions, and avoids mixing energy transfer, reaction profiles, activation energy, chemical cells, fuel cells, exothermic reactions and endothermic reactions unless the objective names them.

Common mistake

Collision Requirement Misconception

Students think that any collision between particles will automatically cause a reaction, ignoring the need for sufficient energy and correct orientation.

Explain that a reaction only occurs when colliding particles have enough kinetic energy to overcome the activation energy barrier and are properly oriented to form new bonds. Use the concept of activation energy and reaction profiles to illustrate that not all collisions lead to products.

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