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)t½​ = ?C0​/2

A first-order reaction has a rate constant of 0.25 min⁻¹. Find its half-life t½.

k = 0.25 min⁻¹
t½ = min
2.Easy
t (min)C/C₀t½​ = 6 min0.5

A first-order reaction has a half-life of 6 min. Find its rate constant k.

t½ = 6 min
k = min⁻¹
3.Medium
t (min)X (%)t = ?80%

A first-order reaction in a batch reactor has k = 0.08 min⁻¹. How long does it take to reach 80% conversion? Find t.

k = 0.08 min⁻¹X = 80 %
t = min
4.Medium
t (min)C (mol/L)2 minC = ?

A reaction with rate law −rA = k·CA² has k = 1 L/(mol·min) and starts at 2 mol/L. Find the concentration CA after 2 min.

k = 1 L/(mol·min)CA0 = 2 mol/Lt = 2 min
CA = mol/L
5.Hard
Tk25 °C0.165 °C?

A reaction has a rate constant of 0.1 min⁻¹ at 25 °C and an activation energy of 90 kJ/mol. Find the rate constant k2 at 65 °C.

k1 = 0.1 min⁻¹T1 = 25 °CT2 = 65 °CEa = 90 kJ/molR = 8.314 J/(mol·K)
k2 = min⁻¹
6.Hard
Tk35 °C0.0565 °C?

A reaction has a rate constant of 0.05 min⁻¹ at 35 °C and an activation energy of 120 kJ/mol. Find the rate constant k2 at 65 °C.

k1 = 0.05 min⁻¹T1 = 35 °CT2 = 65 °CEa = 120 kJ/molR = 8.314 J/(mol·K)
k2 = min⁻¹

Answer key

  1. 1. t½ = 2.773 min
  2. 2. k = 0.1155 min⁻¹
  3. 3. t = 20.12 min
  4. 4. CA = 0.4 mol/L
  5. 5. k2 = 7.332 min⁻¹
  6. 6. k2 = 3.189 min⁻¹

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