Starter quiz
- Which of the following factors does not affect the rate of a chemical reaction?
- temperature
- surface area
- colour of reactants ✓
- concentration
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- What happens to the rate of reaction when the temperature is increased?
- the rate decreases
- the rate increases ✓
- the rate remains unchanged
- the reaction stops
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- What is the minimum energy required for a reaction to occur called?
- 'activation energy' ✓
- What is an end-point method?
- a method to start a reaction
- a method to measure the speed of a reaction
- a method to measure the progress of a reaction until it reaches a certain point ✓
- a method to change the temperature of a reaction
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- What causes the cross to disappear in the disappearing cross experiment?
- the formation of a gas that covers the cross
- the formation of a precipitate that makes the solution cloudy ✓
- the consumption of the cross in the reaction
- a change in temperature that removes the cross
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- Doing which of the following will increase the rate of a reaction?
- heat the reactants to provide the particles with more energy ✓
- heat the reactants to provide the particles with less energy
- increase the number of reactant particles in a certain volume ✓
- decrease the number of reactant particles in a certain volume
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Exit quiz
- What happens to the rate of a chemical reaction when the temperature is increased?
- the rate decreases
- the rate increases ✓
- the rate remains unchanged
- the rate is zero
-
- If the temperature of a reaction increases, what happens to the energy of the particles?
- decreases
- increases ✓
- remains the same
- becomes zero
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- Which of the following explains why increasing temperature increases the rate of reaction?
- it decreases the number of particles
- it reduces the energy of collisions
- it increases the frequency and energy of collisions ✓
- it decreases the surface area of reactants
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- Why does cooling a reactant decrease the rate of a reaction?
- particles have more energy
- particles collide more often
- particles have less energy and collide less often ✓
- particles become more concentrated
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- Which of the following statements about temperature and volume of gas produced is correct?
- Higher temperatures lead to a greater volume of gas being produced.
- Lower temperatures lead to a greater volume of gas being produced.
- The temperature does not affect the overall volume of gas that is produced. ✓
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- What effect does increasing the temperature have on the reactant particles?
- more reactant particles have energy higher than the activation energy ✓
- less reactant particles have energy higher than the activation energy
- the reactant particles have less energy
- the reactant particles release energy
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Worksheet
Presentation
Video
Lesson Details
Key learning points
- Increasing temperature generally increases rate by boosting the energy and frequency of collisions between particles.
- Cooling a reactant decreases its reaction rate by reducing collision energy and frequency.
Common misconception
Increasing the temperature increases the rate product is formed, and therefore think a faster reaction produces more product.
Increasing the temperature will make the reaction proceed faster but will not change the amount of product formed. The reactants are the limiting factor, not the temperature.
Keywords
Collision theory - The collision theory is that particles must collide, and with sufficient energy, in order to react.
Activation energy - The minimum energy that the particles must have in order to react is known as the activation energy.
Rate of reaction - Rate of reaction is the speed with which a chemical reaction takes place.
End-point method - An end-point method is used to measure the progress of a reaction until it has reached completion or a desirable point, e.g. a colour change.