Learning objective

Recognize that a catalyst speeds up a reaction and remains unchanged after the reaction is complete.

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Cambridge IGCSE Combined ScienceChemical reactionsCore content

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Recognize that a catalyst speeds up a reaction and remains unchanged after the reaction is complete

This point belongs to Rate of reaction, especially Rate of reaction outcomes.
You need to be able to recognize that a catalyst speeds up a reaction and remains unchanged after the reaction is complete.
The key ideas to know are State and Define.
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StateDefine

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Paper 3 structured question: Rate of reaction

Paper 3Theory (Core)2 marks

Description

Role of Catalysts

Catalysts are substances that increase the rate of a chemical reaction without being consumed in the process. They provide an alternative pathway for the reaction with lower activation energy.

a
Explain how catalysts affect the rate of chemical reactions.
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Aim for approximately 2 distinct marking points.
[2]

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Related learning objectives

Explain how the rate of a reaction is influenced by factors such as the concentration of solutions, the surface area of solids, the temperature, and the presence of a catalyst.
Rate of reaction outcomes
Outline methods for conducting experiments to measure the rate of a reaction, including observing changes in mass or gas production.
Rate of reaction outcomes
Analyze data from experiments on the rate of reaction, including interpreting graphs.
Rate of reaction outcomes
Discuss how factors such as concentration, surface area, temperature, and catalysts affect the rate of reaction through the principles of collision theory.
Rate of reaction outcomes
Describe the key concepts of collision theory, including particle density, collision frequency, kinetic energy, and activation energy.
Rate of reaction outcomes

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