Collision Model

AP Chemistry· difficulty 1/5

A block of solid reactant and the same mass as a powder are added to acid. Which reacts faster, and why?

A
$Block; less surface tension$
B
$Same rate; same mass$
C
$Block; more concentrated$
D
$Powder; greater surface area gives more collision sites$
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Explanation

Higher surface area in the powder enables more frequent reactant collisions per unit time.

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