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Question 17 (2 points) A chemist is trying to get two substances to react, but he is unsuccessful. He knows that the two substances should react with one anothe Which of the following could he do to possibly get the substances to react? (Select all that apply) Da Ob O c Od De Question 18 (3 points) Match the following equations to the type of reaction. Column A 1. 2 cool the substances heat the substances increase the concentration of one of the substances crush up one of the substances decrease the concentration of one of the substances ​