Physical Science Vocabulary

Physical Property
A charecteristic of a substance that can be observed without changing the identity of the substance.
Physical Change
A change in a substance that does not change the substance into a diffrent one.
Chemical Property
A characteristic of a substance that describes how it can from a new substance.
Chemical Change
A change of one substance into another substance.
States of Matter
The diffrent forms in wich matter can exist.
Solid
Matter that has a definite shape and a definite volume. The molecules are in fixed positions and are close together.
Liquid
Matter that has a definite volume but does not have a definite shape. The molecules in a liquid are close but do not bond together.
Gas
Matter with no definite volume and no definite shape. The molecules in a gas are very far appart, and the amount of space between them can change easily.
Melting
A process by which a solid becomes a liquid.
Melting Point
The lowest temprature at which a substance begins to melt.
Freezing
The process by which a liquid becomes a solid.
Freezing Point
The temprature at which a specific liquid becomes a solid.
Evaporation
A process by which a liquid becomes a gas.
Sublimation
A solid that changes directly into a gas.
Boiling
A process by which a substance changes from a liquid to a gas. The liquid is heated to a temprature at wich bubbles of vapor form within the liquid.
Condensation
The process by which a gas becomes a liquid.
Isotope
An atom of one element that has a diffrent number of nutrons that another atom of the same element.
Ion
An atom or group of atoms that has a positive or negative electric charge.
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