New
New
Year 10
Edexcel
Higher

Temperature and rate: practical

I can explain, using the collision theory, how warming or cooling a reactant will affect the rate of a reaction.

New
New
Year 10
Edexcel
Higher

Temperature and rate: practical

I can explain, using the collision theory, how warming or cooling a reactant will affect the rate of a reaction.

Lesson details

Key learning points

  1. Increasing temperature generally increases rate by boosting the energy and frequency of collisions between particles.
  2. 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.

Prepare the water baths containing the sodium thiosulfate prior to the lesson starting so the solutions have time to reach the desired temperature.
Teacher tip

Equipment

Sodium thiosulfate solution, hydrochloric acid, card with an 'X' on, conical flask, measuring cylinder, ice, beaker, water bath timer, eye protection.

Content guidance

  • Risk assessment required - equipment

Supervision

Adult supervision required

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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6 Questions

Q1.
Which of the following factors does not affect the rate of a chemical reaction?
temperature
surface area
Correct answer: colour of reactants
concentration
Q2.
What happens to the rate of reaction when the temperature is increased?
the rate decreases
Correct answer: the rate increases
the rate remains unchanged
the reaction stops
Q3.
What is the minimum energy required for a reaction to occur called?
Correct Answer: activation energy, activation
Q4.
What is an end-point method?
a method to start a reaction
a method to measure the speed of a reaction
Correct answer: a method to measure the progress of a reaction until it reaches a certain point
a method to change the temperature of a reaction
Q5.
What causes the cross to disappear in the disappearing cross experiment?
the formation of a gas that covers the cross
Correct answer: 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
Q6.
Doing which of the following will increase the rate of a reaction?
Correct answer: heat the reactants to provide the particles with more energy
heat the reactants to provide the particles with less energy
Correct answer: increase the number of reactant particles in a certain volume
decrease the number of reactant particles in a certain volume

6 Questions

Q1.
What happens to the rate of a chemical reaction when the temperature is increased?
the rate decreases
Correct answer: the rate increases
the rate remains unchanged
the rate is zero
Q2.
If the temperature of a reaction increases, what happens to the energy of the particles?
decreases
Correct answer: increases
remains the same
becomes zero
Q3.
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
Correct answer: it increases the frequency and energy of collisions
it decreases the surface area of reactants
Q4.
Why does cooling a reactant decrease the rate of a reaction?
particles have more energy
particles collide more often
Correct answer: particles have less energy and collide less often
particles become more concentrated
Q5.
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.
Correct answer: The temperature does not affect the overall volume of gas that is produced.
Q6.
What effect does increasing the temperature have on the reactant particles?
Correct answer: 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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