The chemicals that go into a reaction are called the ____. The chemicals that are made in a reaction are called the ____. Most reactions are irreversible, but some reactions are ____. This means that the products can react to produce the original reactants again. To show this in a chemical equation, we use two ____, each with just half an arrowhead: The A + B turning into C + D is the ____ reaction and the C+D turning back into A + B is the ____ reaction (also called the reverse reaction). If the chemical reactions happen in a ____ where one or more of the reactants or products can escape, you have an ____ system. If the reaction happens in a container where none of the reactants or products can escape, you have a ____ system- these reactions will eventually reach ____. This is when the forward reaction and the reversed reaction happen at the ____ rate. Changing the reaction ____ can change the amount of products and reactants in a reaction mixture at equilibrium.

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