Rate change from a rate law
For a reaction with rate = k[A]²[B], [A] is tripled and [B] is halved. By what factor does the rate change?
Answer C: explanation for every choice
A
This treats A as first order.
B
This treats A as first order and ignores B.
C
Correct. (3)² × ½ = 9 × 0.5 = 4.5.
D
This ignores the halving of [B].
TakeawayRaise each concentration change to its order, then multiply.
Equation usedRate law
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