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Matter

Unit 2 vocabulary 7th grade

TermDefinition
Activation Energy the minimum amount of energy required to initiate a chemical reaction; written as Ea and measured in kilojoules
Chemical Bond the forces that hold atoms together, these may be ionic, covalent or metallic
Chemical Change a chemical reaction; a process that changes substances into new substances (related word: chemical reaction)
Chemical Property a characteristic of a substance that is measurable or observable during a chemical reaction; includes pH, heat of combustion, reactivity, etc.
Law of Conservation of Mass a fundamental principle of science stating that mass cannot be created or destroyed in a closed system through ordinary chemical or physical means
physical change a change in matter that does not affect its chemical composition
physical property a characteristic that can be observed (intensive), such as texture, color, odor, melting point, boiling point, density, or measured (extensive) such as mass, length, volume, that is used to describe matter and can be observed or measured without changing
precipitate solid particles that have been separated from a solution
product the substances that are formed during a chemical reaction; in a chemical reaction the arrows point toward the product
reactant the substances present before a chemical reaction occurs; in a chemical reaction the arrow usually points away from the reactant(s)
solute a substance that has the ability to be dissolved by a solvent to create a solution
solution a mixture in which a solid and a liquid or two liquids are mixed so evenly, that it is not possible to see the separate particles
solvent the substance that dissolves another substance
Created by: hannerd
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