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Unit 1 Lessons 4, 5, & 6
States of Matter and Changes in State
15
Science
7th Grade
09/16/2014

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Term
Atom
Definition
These are the smallest unit of an element that maintains the properties of that element.
Term
Element
Definition
This is made up of one or more of the same kind of atom chemically combined.
Term
Compound
Definition
This is made up of different kinds of atoms that are chemically combined.
Term
Mixture
Definition
This contains a variety of elements and compounds that are not chemically combined with each other.
Term
Pure Substance
Definition
This is a substance that has definite physical and chemical properties. This type of substance always has the same properties.
Term
Heterogeneous
Definition
This is a kind of mixture that does not have a uniform composition (it is made up of different items or substances NOT spread out evenly).
Term
Homogeneous
Definition
This is a kind of mixture that does has a uniform composition (it is made up of different items or substances ARE spread out evenly).
Term
Solid
Definition
A substance that has definite volume and shape.
Term
Liquid
Definition
A substance that has a definite volume but not a definite shape.
Term
Gas
Definition
A substance that does not have a definite volume or shape.
Term
Freezing
Definition
The change in state in which a liquid is cooled and its particles have less energy.
Term
Melting
Definition
The change in state in which a solid's particles speed up and change.
Term
Evaporation
Definition
The SLOW change of state when a liquid's particles speed up and change.
Term
Boiling
Definition
A rapid change of state when a liquid's particles speed up and change.
Term
Condensation
Definition
A change of state when the particles in a gas slow down and change.
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