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)10 minC = ?

A zero-order reaction A → products has a rate constant of 0.04 mol/(L·min). The initial concentration of A is 0.8 mol/L. Find the concentration CA after 10 min.

k = 0.04 mol/(L·min)CA0 = 0.8 mol/Lt = 10 min
CA = mol/L
2.Easy
t (min)C (mol/L)t½​ = ?C0​/2

A first-order reaction has a rate constant of 0.2 min⁻¹. Find its half-life t½.

k = 0.2 min⁻¹
t½ = min
3.Medium
t (min)X (%)t = ?60%

A zero-order reaction has k = 0.005 mol/(L·min) and starts at 0.8 mol/L. How long does it take to reach 60% conversion? Find t.

k = 0.005 mol/(L·min)CA0 = 0.8 mol/LX = 60 %
t = min
4.Medium
t (min)X (%)t = ?60%

A zero-order reaction has k = 0.025 mol/(L·min) and starts at 1 mol/L. How long does it take to reach 60% conversion? Find t.

k = 0.025 mol/(L·min)CA0 = 1 mol/LX = 60 %
t = min
5.Hard
Tk40 °C0.0165 °C?

A reaction has a rate constant of 0.01 min⁻¹ at 40 °C and an activation energy of 70 kJ/mol. Find the rate constant k2 at 65 °C.

k1 = 0.01 min⁻¹T1 = 40 °CT2 = 65 °CEa = 70 kJ/molR = 8.314 J/(mol·K)
k2 = min⁻¹
6.Hard
1/Tln kT = 40 °Cln 0.001ln A = ?Ea​ = 80 kJ/mol

A first-order reaction has a rate constant of 0.001 s⁻¹ at 40 °C and an activation energy of 80 kJ/mol. Find the pre-exponential factor A in the Arrhenius equation.

k = 0.001 s⁻¹T = 40 °CEa = 80 kJ/molR = 8.314 J/(mol·K)
A = s⁻¹

Answer key

  1. 1. CA = 0.4 mol/L
  2. 2. t½ = 3.466 min
  3. 3. t = 96 min
  4. 4. t = 24 min
  5. 5. k2 = 0.07299 min⁻¹
  6. 6. A = 2.212 × 10¹⁰ s⁻¹

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