Which of these might affect whether or not a particular chemical reaction occurs?
a.) adding a catalyst
b.) increasing the heat
c.) increasing the pressure
d.) all of these may a chemical reaction occur

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c is the answer because when something is left after something evaporates that shows the chemical change.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.