which of the following statements about catalysts is true? catalysts are always ionic. catalysts are chemically unchanged at the end of a reaction. catalysts increase the activation energy. catalysts increase the temperature of a chemical reaction

Answer;

Catalysts are chemically unchanged at the end of a reaction.

Explanation;A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy without itself being consumed by the reaction.Activation energy is the minimum amount of energy required for a chemical reaction to proceed in the forward direction.Catalysts are unchanged at the end of the reactions in which they participate.An enzyme is considered a catalyst because it speeds up chemical reactions without being used up. An enzyme lowers the temperature at which a reaction proceeds.

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two layers of different liquids=two phases.

Because oil doesn't dissolve in water. It only floats on water.

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