Reaction kinetics worksheet with answers

Free printable Reaction kinetics worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
t (min)C (mol/L)5 minC = ?

A zero-order reaction A → products has a rate constant of 0.005 mol/(L·min). The initial concentration of A is 1.5 mol/L. Find the concentration CA after 5 min.

k = 0.005 mol/(L·min)CA0 = 1.5 mol/Lt = 5 min
CA = mol/L
2.Easy
CA​ (mol/L)r2r = ?CB​ = 1.2 mol/L

The reaction A + B → C follows the rate law r = k·CB, with k = 0.005 s⁻¹. Find the reaction rate r when CA = 2 mol/L and CB = 1.2 mol/L.

r = k·CBk = 0.005 s⁻¹CA = 2 mol/LCB = 1.2 mol/L
r = mol/(L·s)
3.Medium
t (min)C (mol/L)30 minC = ?

A reaction with rate law −rA = k·CA² has k = 0.25 L/(mol·min) and starts at 2 mol/L. Find the concentration CA after 30 min.

k = 0.25 L/(mol·min)CA0 = 2 mol/Lt = 30 min
CA = mol/L
4.Medium
t (min)C (mol/L)20 minC = ?

A reaction with rate law −rA = k·CA² has k = 0.1 L/(mol·min) and starts at 1 mol/L. Find the concentration CA after 20 min.

k = 0.1 L/(mol·min)CA0 = 1 mol/Lt = 20 min
CA = mol/L
5.Hard
CA0​ (mol/L)r (mol/(L·s))run 10.250.005run 20.750.00866n = ?

Two experiments measure the initial rate of A → products. With CA0 = 0.25 mol/L the rate is 0.005 mol/(L·s); with CA0 = 0.75 mol/L it is 0.00866 mol/(L·s). Find the reaction order n with respect to A.

CA0,1 = 0.25 mol/Lr1 = 0.005 mol/(L·s)CA0,2 = 0.75 mol/Lr2 = 0.00866 mol/(L·s)
n =
6.Hard
CA0​ (mol/L)r (mol/(L·s))run 10.40.012run 21.60.096n = ?

Two experiments measure the initial rate of A → products. With CA0 = 0.4 mol/L the rate is 0.012 mol/(L·s); with CA0 = 1.6 mol/L it is 0.096 mol/(L·s). Find the reaction order n with respect to A.

CA0,1 = 0.4 mol/Lr1 = 0.012 mol/(L·s)CA0,2 = 1.6 mol/Lr2 = 0.096 mol/(L·s)
n =

Answer key

  1. 1. CA = 1.475 mol/L
  2. 2. r = 0.006 mol/(L·s)
  3. 3. CA = 0.125 mol/L
  4. 4. CA = 0.3333 mol/L
  5. 5. n = 0.5
  6. 6. n = 1.5

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