Rates of reaction
13 review questions with answers for Rates of reaction. Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
Rate increases with temperature partly because particles move…?
- Slower
- Less often
- In straight lines
- FasterRight answer
What this set covers
What changes how fast a reaction goes, explained with collisions and activation energy. Temperature, concentration, surface area and catalysts appear, along with measuring a mean rate in cm³ s⁻¹ and reading a gas volume against time graph.
- Common mix-up
- Students often say a catalyst gives particles more energy, but it lowers the activation energy, so more collisions are successful without any change to the particles' energy.
- Review tip
- Sketch a gas volume against time graph for marble chips and acid, label where the rate is fastest and why it levels off, then add a second curve for powdered marble.
All 13 questions and answers
Rate increases with temperature partly because particles move…?
Answer: Faster
Minimum energy colliding particles need for a reaction to happen?
Answer: Activation energy
Substance that speeds up a reaction without being used up?
Answer: Catalyst
Biological catalysts?
Answer: Enzymes
Effect of a catalyst on the activation energy?
Answer: Lowers it
Powdered marble reacts faster than marble chips because it has a larger…?
Answer: Surface area
Raising the concentration of an acid increases rate because of more frequent…?
Answer: Collisions
Gas collected in a syringe when marble chips react with hydrochloric acid?
Answer: Carbon dioxide
Unit of rate when gas volume is measured over time?
Answer: cm³ s⁻¹
Mean rate if 60 cm³ of gas is collected in 30 s?
Answer: 2 cm³ s⁻¹
On a gas volume–time graph, the steepest part shows where the rate is…?
Answer: Fastest
A gas volume–time graph levels off because…?
Answer: A reactant runs out
In the disappearing cross experiment, the cross vanishes because a … forms?
Answer: Precipitate
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.