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

A first-order reaction A → products has a rate constant of 0.08 min⁻¹. The initial concentration of A is 1 mol/L. Find the concentration C_A after 15 min.

k = 0.08 min⁻¹C_A0 = 1 mol/Lt = 15 min

C_A = mol/L

2.Easy

A first-order reaction A → products has a rate constant of 0.2 min⁻¹. The initial concentration of A is 0.5 mol/L. Find the concentration C_A after 10 min.

k = 0.2 min⁻¹C_A0 = 0.5 mol/Lt = 10 min

C_A = mol/L

3.Medium

A reaction with rate law −r_A = k·C_A² has k = 0.1 L/(mol·min) and starts at 1 mol/L. Find the concentration C_A after 30 min.

k = 0.1 L/(mol·min)C_A0 = 1 mol/Lt = 30 min

C_A = mol/L

4.Medium

In a first-order reaction the concentration of A falls from 1.5 mol/L to 0.525 mol/L in 20 min. Find the rate constant k.

C_A0 = 1.5 mol/LC_A = 0.525 mol/Lt = 20 min

k = min⁻¹

5.Hard

Two experiments measure the initial rate of A → products. With C_A0 = 0.5 mol/L the rate is 0.01 mol/(L·s); with C_A0 = 1 mol/L it is 0.0283 mol/(L·s). Find the reaction order n with respect to A.

C_A0,1 = 0.5 mol/Lr₁ = 0.01 mol/(L·s)C_A0,2 = 1 mol/Lr₂ = 0.0283 mol/(L·s)

n =

6.Hard

A reaction has a rate constant of 0.002 min⁻¹ at 30 °C and an activation energy of 120 kJ/mol. Find the rate constant k₂ at 40 °C.

k₁ = 0.002 min⁻¹T₁ = 30 °CT₂ = 40 °CE_a = 120 kJ/molR = 8.314 J/(mol·K)

k₂ = min⁻¹

Answer key

1. C_A = 0.3012 mol/L
2. C_A = 0.06767 mol/L
3. C_A = 0.25 mol/L
4. k = 0.05249 min⁻¹
5. n = 1.501
6. k₂ = 0.009148 min⁻¹

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