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Chemistry
1-15
15
Science
7th Grade
11/23/2008

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Term
physical property
Definition
a characteristic of a substance that can be observed without changing the substance into something else
Term
chemical property
Definition
a characteristic that is observed when a substance changes into a different substance
Term
element
Definition
a substance that cannot be broken down into any other substances by chemical or physical means
Term
symbol
Definition
an element is represented by a one or two letter symbol...H or Fe or N
Term
compound
Definition
a substance made of 2 or more elements that are chemically bound together in a set ratio
Term
formula
Definition
shows the ratio of elements in the compound
Term
mixture
Definition
consists of 2 or more substances in the same place that are not chemically combined
Term
physical change
Definition
alters the form or appearance of a material but does not convert the material into a new substance
Term
chemical change
Definition
a change in matter that forms one or more new substances
Term
chemical equation
Definition
a short simple way to describe a chemical reaction using symbols and formulas
Term
reactants
Definition
the substances you start with in a chemical reaction
Term
products
Definition
the substances you end with in a chemical reaction
Term
atom
Definition
the smallest particle of an element
Term
molecule
Definition
a particle made of 2 or more atoms
Term
chemical bond
Definition
a force (glue) that holds atoms together
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