Practice question · Fill in the blanks
Complete the statement with the correct term.
For a first-order reaction A → products, the rate law is rate = k·[A]ⁿ. The exponent n equals ______.
Word bank: 0 · 2 · 1 · 3
Hints
- The order is the exponent on concentration in the rate law.
- For this order the half-life does not depend on the starting amount.
Show the answer
For a first-order reaction A → products, the rate law is rate = k·[A]ⁿ. The exponent n equals 1.
Why
First-order means rate ∝ [A]¹. The exponent (reaction order) is 1, and the half-life /₂ = /k is independent of concentration.
Practise Reaction rates and collision reasoning
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