C2- Rates and energy

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1. What is an Exothermic reaction?

  • A reaction where heat energy is given out
  • A reaction where heat energy is taken in
  • A reaction where gas is given off
  • A reaction where the reactants are used up
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2. What is the minimum amount of energy required for a reaction called?

  • Activation Energy
  • Catalyst energy
  • Minimum energy
  • Reactor energy

3. Which of the following statements about collisions is correct?

  • Collisions only happen if there is heat
  • All colliding particles have the same amount of energy
  • Reactions can happen if the colliding particles have enough energy
  • Only fast-moving particles collide with each other

4. What happens when the surface area of a solid is increased?

  • The reaction expands
  • The rate of reaction increases
  • No change
  • The rate of reaction decreases

5. How does a catalyst increase the rate of reaction?

  • Pushes the particles closer together
  • Lowers the activation energy
  • Makes the particles move faster
  • Increases the energy of the reaction

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