Worksheet: Collision Theory

In this worksheet, we will practice using collision theory to describe the effect of solvent, temperature, and concentration on reaction rates.


Increasing the temperature usually causes the rate of a reaction to increase. Which of the following is not usually a cause of this effect?

  • AMolecules collide more frequently.
  • BChemical bonds vibrate more strongly.
  • CMore molecules exceed the activation energy for the reaction.
  • DElectrons are promoted to higher-energy orbitals.
  • EThe average kinetic energy of molecules is increased.


When a molecule of O 2 collides with a molecule of C O , a molecule of C O 2 may be formed. Which of the following is not a requirement for this reaction to take place?

  • AThe molecules collide at an angle that allows for strong orbital overlap.
  • BThe kinetic energy of the colliding molecules exceeds the activation energy for the reaction.
  • CThe O 2 molecule collides with the carbon atom of the C O molecule.
  • DValence electrons in the C O molecule are excited to a higher energy level before the collision takes place.
  • EThe collision produces a transition state in which the original C O bond is lengthened.


Magnesium reacts with aqueous hydrochloric acid to form aqueous magnesium chloride. Which of the following quantities could be reduced to increase the rate of this reaction?

  • AMagnesium mass
  • BTemperature
  • CAcid volume
  • DpH
  • EMagnesium surface area

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