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There are several rules involving rates of this type of reaction, one of which is the higher the molarity of the solvent (HCl), the faster the reaction will go.

{Further explanation}

A higher molarity of something means there is more of something dissolved into it. In this case, more HCl is in water. Since 1.0 is greater than 0.5, we can safely assume there is going to be more HCl in the 1.0 M solution. More HCl means that more molecules of Zn and HCl will be colliding and any given time, therefore, it will react faster.

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Q: Does a cube of Zn react faster in 1.0 M of HCl or 0.5 M of HCl?
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