Science Unit 4 Vocab

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Vocabulary from Unit 4 of Indiana Grade 8 Interactive Science.

Solid

Has a definite volume and definite shape

Liquid

Has a definite volume and indefinite shape

Gas

Has an indefinite volume and indefinite shape

Physical Change

A change that alters the form or appearance of a material but does not make the material into another substance

Chemical Change

A change in which one or more substances combine or break apart to form new substances

Melting

Changing from a solid to a liquid

Reactant

A substance that enters into a chemical reaction

Product

A substance formed as a result of a chemical reaction

Precipitate

A solid that forms from a solution during a chemical reaction

Exothermic

A reaction that releases energy, usually in the form of heat

Endothermic

A reaction that absorbs energy

Freezing

Changing from a liquid to a solid

Matter

Anything that has mass and takes up space

Catalyst

Something that sparks or accelerates a chemical reaction

Coefficient

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction

Chemical Equation

A short, easy way to show a chemical reaction, using symbols

Chemical Reaction

A reaction where a new substance is formed or a substance is broken down into others

Condensation

Changing from a gas to a liquid

Evaporation

Changing from a liquid to a gas

Synthesis

A chemical reaction in which two or more simple substances combine to form a new, more complex substance

Decomposition

A chemical reaction that breaks down compounds into simpler products

Replacement

A chemical reaction in which one element replaces another in a compound or when two elements in different compounds trade places

Conservation of Mass

The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change.

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