study guides for every class that actually explain what's on your next test Reactants
from class: General Biology I Definition Reactants are the starting substances that undergo chemical changes in a reaction. They are present before the reaction begins and are transformed into products.
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Predict what's on your test 5 Must Know Facts For Your Next Test Reactants are consumed during a chemical reaction. The amount of reactants determines the quantity of products formed. Reactants can be elements, compounds, or molecules. In a balanced chemical equation, reactants are listed on the left side. The rate at which reactants are used up can affect the speed of the reaction. Review Questions What role do reactants play in a chemical reaction? Where are reactants found in a balanced chemical equation? How do reactants affect the quantity of products formed? "Reactants" also found in:
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