Q.1
Which of the following explains the meaning of effective collision?
  • The collision where its energy is less than the activation energy
  • The collision that has a low energy
  • The collision which takes place before a reaction
  • The collision that causes a reaction
Q.2
Which of the following is the meaning of activation energy?
  • The minimum amount of energy that particles must have in order to react
  • The maximum energy that the particles need to produce effective collision
  • The amount of energy used by the particles during a collision
  • The amount of kinetic energy of molecules during a collision
Q.3
Which factors affect the rate of a reaction?
  • temperature
  • pressure
  • concentration
  • catalyst
  • All of the above
Q.4
Grinding an effervescent tablet into powder increases the rate of reaction due to increase of
  • concentration
  • temperature
  • size
  • total surface area
Q.5
As the frequency of ________________ collision increases, the rate of reaction increases.
  • time
  • speed
  • effective
  • None
Q.6
Why does a catalyst increase the rate of reaction?
  • it produces extra energy for the reactants
  • it increases the speed of the reactant particles
  • it increases the frequency of particle collisions
  • it reduces the activation energy of the reaction
Q.7
Define rate of reaction?
  • The change in concentration of reactants or products per time unit.
  • The change in volume of products multiplied by the change in volume of reactants.
  • The change of products over the change of reactants.
  • How much the reactants react in a given time unit.
Q.8
Which of the following would increase the INITIAL reaction rate between 5.0 g aluminium and 20.0 mL of 1.M hydrochloric acid?
  • Conducting the experiment in a 50 mL beaker rather than a 100 mL beaker.
  • Using a larger volume of acid.
  • Cleaning the surface of the metal with sandpaper.
  • Increasing the pressure under which the experiment was conducted.
Q.9
Increasing pressure means that particles are ___________ together.
  • Happy
  • Never
  • Paired
  • Closer
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