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

The reaction A + B → C follows the rate law r = k·C_A, with k = 0.05 s⁻¹. Find the reaction rate r when C_A = 0.1 mol/L and C_B = 1 mol/L.

r = k·C_Ak = 0.05 s⁻¹C_A = 0.1 mol/LC_B = 1 mol/L

r = mol/(L·s)

2.Easy

The reaction A + B → C follows the rate law r = k·C_A·C_B, with k = 0.1 L/(mol·s). Find the reaction rate r when C_A = 0.4 mol/L and C_B = 1 mol/L.

r = k·C_A·C_Bk = 0.1 L/(mol·s)C_A = 0.4 mol/LC_B = 1 mol/L

r = mol/(L·s)

3.Medium

A reaction with rate law −r_A = k·C_A² has k = 0.8 L/(mol·min) and starts at 1 mol/L. Find the concentration C_A after 2 min.

k = 0.8 L/(mol·min)C_A0 = 1 mol/Lt = 2 min

C_A = mol/L

4.Medium

A reaction with rate law −r_A = k·C_A² has k = 0.05 L/(mol·min) and starts at 1 mol/L. Find the concentration C_A after 20 min.

k = 0.05 L/(mol·min)C_A0 = 1 mol/Lt = 20 min

C_A = mol/L

5.Hard

A reaction has a rate constant of 0.005 min⁻¹ at 25 °C and an activation energy of 70 kJ/mol. Find the rate constant k₂ at 65 °C.

k₁ = 0.005 min⁻¹T₁ = 25 °CT₂ = 65 °CE_a = 70 kJ/molR = 8.314 J/(mol·K)

k₂ = min⁻¹

6.Hard

A reaction has a rate constant of 0.02 min⁻¹ at 30 °C and an activation energy of 60 kJ/mol. Find the rate constant k₂ at 70 °C.

k₁ = 0.02 min⁻¹T₁ = 30 °CT₂ = 70 °CE_a = 60 kJ/molR = 8.314 J/(mol·K)

k₂ = min⁻¹

Answer key

1. r = 0.005 mol/(L·s)
2. r = 0.04 mol/(L·s)
3. C_A = 0.3846 mol/L
4. C_A = 0.5 mol/L
5. k₂ = 0.1412 min⁻¹
6. k₂ = 0.3208 min⁻¹

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