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23 terms

Science Unit 4 Vocab

Vocabulary from Unit 4 of Indiana Grade 8 Interactive Science.
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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.