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/C₀t½​ = 8 min0.5

A first-order reaction has a half-life of 8 min. Find its rate constant k.

t½ = 8 min
k = min⁻¹
2.Easy
t (min)C (mol/L)t½​ = ?C0​/2

A first-order reaction has a rate constant of 0.15 min⁻¹. Find its half-life t½.

k = 0.15 min⁻¹
t½ = min
3.Medium
t (min)X (%)t = ?99%

A first-order reaction in a batch reactor has k = 0.02 min⁻¹. How long does it take to reach 99% conversion? Find t.

k = 0.02 min⁻¹X = 99 %
t = min
4.Medium
t (min)C (mol/L)10 minC = ?

A reaction with rate law −rA = k·CA² has k = 0.1 L/(mol·min) and starts at 2 mol/L. Find the concentration CA after 10 min.

k = 0.1 L/(mol·min)CA0 = 2 mol/Lt = 10 min
CA = mol/L
5.Hard
Tk35 °C0.0145 °C?

A reaction has a rate constant of 0.01 min⁻¹ at 35 °C and an activation energy of 120 kJ/mol. Find the rate constant k2 at 45 °C.

k1 = 0.01 min⁻¹T1 = 35 °CT2 = 45 °CEa = 120 kJ/molR = 8.314 J/(mol·K)
k2 = min⁻¹
6.Hard
Tk40 °C0.0280 °C?

A reaction has a rate constant of 0.02 min⁻¹ at 40 °C and an activation energy of 120 kJ/mol. Find the rate constant k2 at 80 °C.

k1 = 0.02 min⁻¹T1 = 40 °CT2 = 80 °CEa = 120 kJ/molR = 8.314 J/(mol·K)
k2 = min⁻¹

Answer key

  1. 1. k = 0.08664 min⁻¹
  2. 2. t½ = 4.621 min
  3. 3. t = 230.3 min
  4. 4. CA = 0.6667 mol/L
  5. 5. k2 = 0.04359 min⁻¹
  6. 6. k2 = 3.701 min⁻¹

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