Reaction kinetics

Class 11 · Chemistry · 5 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