Fill in the blanks: a heterogeneous mixture is made of parts that distinguishable from each other.

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Explanation:

In a heterogenous mixture, it is easy to tell the different pieces and parts from each other. For example, cereal with fruit added to it, or trail mix made of peanuts, raisins and candy. You can easily see the parts of the mixture. A homogenous mixture is one in which you can't see the parts easily, like ketchup or the air we breathe.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.