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A chemical reaction is where multiple substances are transformed into a new substance or new substances. This means that the actual chemical structure at a molecular level has changed. The substances going into the reaction are called the reactants, while the new substance or substances created are called the products. In order for a chemical reaction to occur, particles must collide. We call this collision theory. If two particles collide with enough energy then the bonds will break and atoms will be open to form new bonds with other atoms, and therefore, creating the new substance. The level of energy required at collision for the reaction to actually occur is called the activation energy. For a collision to be a successful one, where the two reactants actually react together, they need to collide with enough energy and in the correct orientation. There are five ways to speed up a chemical reaction. The first is to increase the temperature. When we inc