Reaction kinetics

Written by Dr. Ayesha Nadeem (Chemistry)

Class 11 · Chemistry · 8 questions

Name: ____________________   Date: ____________

1. The rate of a reaction usually increases with temperature because:

   • A Molecules get larger
   • B More molecules have enough energy to react
   • C Activation energy increases
   • D Pressure falls

2. A catalyst increases rate by:

   • A Lowering the activation energy
   • B Raising Kc
   • C Raising temperature
   • D Increasing concentration

3. For rate = k [A]^2, doubling [A] changes the rate by a factor of:

   • A 2
   • B 8
   • C 4
   • D 1

4. The unit of rate of reaction is:

   • A s-1 only
   • B mol dm-3
   • C dm3 mol-1
   • D mol dm-3 s-1

5. The half life of a first order reaction is:

   • A Independent of initial concentration
   • B Proportional to concentration
   • C Inversely proportional to k only
   • D Zero

6. The order of a reaction is found:

   • A From the colour
   • B From the name
   • C From the equation only
   • D By experiment

7. A reaction rate typically doubles for a 10 degree rise in temperature. This is a rule of thumb that shows:

   • A Rate rises with temperature
   • B Temperature has no effect
   • C The reaction stops
   • D Rate falls with temperature

8. A heterogeneous catalyst is:

   • A In a different phase from the reactants
   • B In the same phase
   • C A liquid always
   • D A gas always