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D. Breaking up a reactant into smaller pieces.

This would cause the chemical reaction to act quicker on a smaller volumetric level.

f

step-by-step explanation:

f

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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