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Chapter 14 Vocab.
Science- Chemical Reactions
Term | Definition |
---|---|
Chemical Reaction | a process in which one or more substances change to make one or more new substances |
Precipitate | a solid substance that is formed in a solution |
Chemical Formula | a shorthand way to use chemical symbols and numbers to represent a substance |
Chemical Equation | uses chemical symbols and formulas as a shortcut to describe a chemical reaction |
Reactants | the starting materials in a chemical reaction |
Products | the substances formed from a reaction |
Law of Conservation of Mass | This law states that mass is neither created nor destroyed in ordinary chemical and physical changes. This law means that a chemical equation must show the same numbers and kinds of atoms on both sides of the arrow. |
Synthesis Reaction | a reaction in which two or more substances combine to form one new compound |
Decomposition Reaction | a reaction in which a single compound breaks down to form two or more simpler substances |
Single- Displacement Reaction | an element replaces another element that is a part of a compound; the products are a new compound and a different element |
Double-Displacement Reaction | a reaction in which ions from two compounds exchange places |
Exothermic Reaction | a chemical reaction in which energy is released |
Endothermic Reaction | a chemical reaction in which energy is taken in |
Law of Conservation of Energy | states that energy cannot be created or destroyed. However, energy can change forms. And energy can be transferred from one object to another . |