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SingaporeChemistryQuick questions
Energetics, Rates and Redox
Quick questions on Speed of reaction: N(A)-Level Chemistry
7short 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 is concentration?Show answer
A higher concentration means the particles are more crowded together. They collide more often, so there are more successful collisions each second and the reaction is faster. A more dilute solution reacts more slowly.
What is temperature?Show answer
A higher temperature gives the particles more energy, so they move faster. They collide more often and, more importantly, more of the collisions have enough energy to react. So the reaction is faster. A lower temperature slows it down.
What is surface area?Show answer
Breaking a solid into smaller pieces (or a powder) gives it a larger surface area. More particles are exposed, so there are more places for collisions to happen. The reaction is faster. A single large lump has a small surface area and reacts slowly.
What is a catalyst?Show answer
A catalyst speeds up a reaction without being used up. It works by giving the particles an easier path that needs less energy, so more collisions are successful. Because it is not used up, a small amount can be used again and again.
What is q1?Show answer
State two factors that would speed up the reaction between zinc and dilute acid. [2 marks]
What is q2?Show answer
Explain, using particles, why a reaction is faster at a higher temperature. [2 marks]
What is q3?Show answer
State what a catalyst does to a reaction and one reason it is useful. [2 marks]
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