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SingaporeChemistryQuick questions
Energetics, Rates of Reaction and Redox
Quick questions on Catalysts and reaction speed explained: O-Level Chemistry
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are enzymes as biological catalysts?Show answer
Enzymes are catalysts made by living things (they are proteins) that speed up the reactions in cells. Like other catalysts, they lower the activation energy and are not used up. They are highly specific (each enzyme catalyses a particular reaction) and work best within a narrow range of temperature and pH; outside that range they stop working effectively. Enzymes are used in food production, washing powders and brewing.
What is q1?Show answer
State two features of a catalyst. [1 mark]
What is q2?Show answer
Explain how a catalyst increases the rate of a reaction. [2 marks]
What is q3?Show answer
On a graph of gas volume against time, state what the flat (horizontal) part of the curve shows. [1 mark]
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