Chemical Kinetics – Interactive Quiz & Cheatsheet
Learn about reaction rates, order, and molecularity through this fun and informative quiz tool
Updated: 10 months ago
Chemical Kinetics Cheatsheet
Cheat Codes & Shortcuts
- Definition: Study of the rates of chemical reactions and the factors affecting them.
- Rate Law: \( \text{Rate} = k [A]^m [B]^n \)
- Order of Reaction: Sum of the exponents in the rate law (m + n).
- Zero-Order: Rate = k, independent of concentration.
- First-Order: Rate = k[A], exponential decay.
- Second-Order: Rate = k[A]^2 or k[A][B].
- Integrated Rate Law: Relates concentration to time.
- Half-Life: Time for concentration to halve.
- Arrhenius Equation: \( k = A e^{-E_a / RT} \)
- Activation Energy: \( E_a \), energy barrier for reaction.
Quick Reference Table
| Order | Rate Law | Integrated Rate Law |
|---|---|---|
| Zero | \( \text{Rate} = k \) | \( [A] = [A]_0 - kt \) |
| First | \( \text{Rate} = k[A] \) | \( \ln[A] = \ln[A]_0 - kt \) |
| Second | \( \text{Rate} = k[A]^2 \) | \( \frac{1}{[A]} = \frac{1}{[A]_0} + kt \) |
| Half-Life (Zero) | \( t_{1/2} = \frac{[A]_0}{2k} \) | Depends on initial concentration |
| Half-Life (First) | \( t_{1/2} = \frac{0.693}{k} \) | Independent of [A]_0 |
| Arrhenius | \( k = A e^{-E_a / RT} \) | Plot \ln k vs 1/T for E_a |
Advice
First Step: Always determine the order from experimental data or rate law.
Use Plots: Linear plots to identify order: [A] vs t (zero), ln[A] vs t (first), 1/[A] vs t (second).
Don’t Forget Units: Check units of k to confirm order.
Temperature Effect: Use Arrhenius equation for activation energy.
Verify: After finding rate law, confirm with half-life or integrated form.
Chemical Kinetics Quick Tips
- Zero-Order: Rate constant, units M/s, half-life depends on [A]_0.
- First-Order: Rate = k[A], units /s, half-life constant.
- Second-Order: Rate = k[A]^2, units /M s, half-life inversely proportional to [A]_0.
- Arrhenius Plot: ln k vs 1/T gives slope = -E_a/R.
- Catalyst: Lowers E_a, increases rate without being consumed.
Chemical Kinetics Speed Quiz
Test your speed with 5 chemical kinetics questions! You have 30 seconds per question.
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