Worksheet: The Collision Theory

In this worksheet, we will practice explaining the principles of collision theory and how temperature, pressure, and concentration affect reaction rate.


Collision theory states that chemical reactions occur when particles (for example, atoms or molecules) collide. Which of the following, according to collision theory, does not play a part in determining the rate of a reaction?

  • A The activation energy for the reaction
  • B The energy with which particles collide
  • C The number of particles analyzed
  • D The frequency with which particles collide


Which one of the following would not increase the rate of a reaction, according to collision theory?

  • A Increasing the temperature
  • B Increasing the pressure
  • C Using a differently shaped container with the same volume
  • D Increasing the surface area of particles
  • E Using a catalyst


Which one of the following would not increase the rate of a reaction, according to collision theory?

  • A Particles colliding more frequently
  • B A higher particle concentration
  • C A higher temperature
  • D Particles having more energy
  • E A higher activation energy


When two reactive particles collide, there are many factors that affect whether a reaction will occur.

Which of the following factors does not have an effect?

  • AThe temperature
  • BThe orientations of particles
  • CThe activation energy
  • DThe energy of the collision
  • EThe number of products


When lightning strikes, molecules of oxygen ( O ) 2 and nitrogen ( N ) 2 in the atmosphere are given enough energy to combine together to form nitric oxide ( N O ) . Under normal conditions, oxygen and nitrogen molecules collide but do not react. What does this suggest about the reaction?

  • AIt has a very large activation energy.
  • BIt is irreversible.
  • CIt is reversible.
  • DIt is catalyzed by lightning.
  • EIt cannot be performed without a catalyst.


For a simple reaction between gases A and B , which of the following temperatures will give the highest reaction rate?

  • A 7 5 C
  • B 2 5 C
  • C 5 0 C
  • D 1 0 0 C
  • E 0 C


When a reaction mixture is heated, the particles collide more frequently. Which of the following is the best explanation of this effect?

  • A The particles break apart.
  • B The particles exert stronger attractive forces.
  • C The particles move faster.
  • D The particles get larger.
  • E The particles get closer together.

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