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Unit 1

Investigating Chemicals

TermDefinition
ELEMENT A pure substance that cannot be broken down into other substances.
PURE SUBSTANCE Made of one kind of particle and has a fixed or definite structure.
CHEMICAL SYMBOL Used to represent an element by using 1-2 letters to identify an element.
COMPOUND A pure substance made up of 2 or more elements that are chemically combined.
CHEMICAL FORMULA A combination of symbols that represent the elements in a compound.
SUBSCRIPT Shows the number of atoms of an element.
CHEMICAL CHANGES Forms one or more new substances.
PHYSICAL CHANGES Changes the appearance of a substance but a new substance is not formed.
PRECIPITATE A solid that forms from a solution during a chemical change.
EVIDENCE OF A CHEMICAL REACTION Color Change, Production of Gas, Change in Temperature, and Production of a Precipitate
PHYSICAL PROPERTIES Characteristics of a substance that are observed without changing the substance into something else.
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