Explain collision theory as it relates to the formation of a solution.

When molecules of the reactant hit each other, only a certain percentage of the collisions cause a chemical change.If the molecules are moving too slowly, they will bounce off each other. There will be no reaction.If the molecules are moving rapidly but do not collide with the correct orientation, they will again bounce off each other. There will be no reaction.

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I hope this helps 

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Zane

answer; talc and gypsum;

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.