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/C₀ (%)30 min?

A first-order reaction has a half-life of 15 min. What percentage f of the reactant is still left after 30 min?

t½ = 15 mint = 30 min
f = %
2.Easy
t (min)C (mol/L)15 minC = ?

A first-order reaction A → products has a rate constant of 0.02 min⁻¹. The initial concentration of A is 0.5 mol/L. Find the concentration CA after 15 min.

k = 0.02 min⁻¹CA0 = 0.5 mol/Lt = 15 min
CA = mol/L
3.Medium
t (min)C (mol/L)10 minC = ?

A reaction with rate law −rA = k·CA² has k = 0.25 L/(mol·min) and starts at 1.5 mol/L. Find the concentration CA after 10 min.

k = 0.25 L/(mol·min)CA0 = 1.5 mol/Lt = 10 min
CA = mol/L
4.Medium
t (min)X (%)t = ?75%

A first-order reaction in a batch reactor has k = 0.1 min⁻¹. How long does it take to reach 75% conversion? Find t.

k = 0.1 min⁻¹X = 75 %
t = min
5.Hard
Tk40 °C0.0150 °C?

A reaction has a rate constant of 0.01 min⁻¹ at 40 °C and an activation energy of 50 kJ/mol. Find the rate constant k2 at 50 °C.

k1 = 0.01 min⁻¹T1 = 40 °CT2 = 50 °CEa = 50 kJ/molR = 8.314 J/(mol·K)
k2 = min⁻¹
6.Hard
Tk30 °C0.150 °C?

A reaction has a rate constant of 0.1 min⁻¹ at 30 °C and an activation energy of 50 kJ/mol. Find the rate constant k2 at 50 °C.

k1 = 0.1 min⁻¹T1 = 30 °CT2 = 50 °CEa = 50 kJ/molR = 8.314 J/(mol·K)
k2 = min⁻¹

Answer key

  1. 1. f = 25 %
  2. 2. CA = 0.3704 mol/L
  3. 3. CA = 0.3158 mol/L
  4. 4. t = 13.86 min
  5. 5. k2 = 0.01812 min⁻¹
  6. 6. k2 = 0.3414 min⁻¹

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