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Physical Science 5
week 5 vocabulary
10
Science
8th Grade
09/05/2013

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Term
atom
Definition
The basic building block of all matter that is the smallest unit of an element that still has the chemical properties of that element.
Term
molecule
Definition
Smallest unit of a compound; form when atoms join
Term
States of matter
Definition
Also called phases of matter; solid, liquid, gas, and plasma
Term
Solid
Definition
Have a fixed shape and a fixed volume.
Term
Liquid
Definition
Have no fixed shape, they take the shape of their container, but they do have a fixed volume.
Term
Gas
Definition
No fixed shape or volume, gases take the shape of their container and completely fill it.
Term
Physical properties
Definition
A characteristic of a substance that can be observed directly or measured with a tool without changing the composition of the substance. Examples include: volume, mass, weight, density, texture, and color
Term
Physical change
Definition
Any change in a substance in which the composition of the substance does not change. Examples include: stretching a rubber band, smashing a pumpkin, melting ice, and slicing a carrot.
Term
Pure substance
Definition
a kind of matter that cannot be separated into other kinds of matter by any physical or chemical process
Term
Compound
Definition
A pure substance composed of more than one type of element chemically combined in a fixed proportion
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