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?

  • AThe activation energy for the reaction
  • BThe number of particles analyzed
  • CThe frequency with which particles collide
  • DThe energy with which particles collide


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

  • AIncreasing the pressure
  • BUsing a catalyst
  • CIncreasing the surface area of particles
  • DIncreasing the temperature
  • EUsing a differently shaped container with the same volume


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

  • AA higher activation energy
  • BA higher particle concentration
  • CParticles colliding more frequently
  • DA higher temperature
  • EParticles having more 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 energy of the collision
  • BThe activation energy
  • CThe orientations of particles
  • DThe temperature
  • 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 (NO). Under normal conditions, oxygen and nitrogen molecules collide but do not react. What does this suggest about the reaction?

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


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

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


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

  • AThe particles get larger.
  • BThe particles get closer together.
  • CThe particles break apart.
  • DThe particles exert stronger attractive forces.
  • EThe particles move faster.

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