Physical Science Ch. 2 Vocabulary Words

Conductivity

A material's ability to allow heat to flow

Compound

A substance that is made from 2 or more simpler substances and can be broken down into those simpler substances

Reactivity

How readily a substance combines chemically with other substances

Heterogenous Mixture

A type of mixture in which the parts of the mixture are noticeably different from one another; i.e sand, salad, chocolate chip cookie; chicken noodle soup

Flammability

A material's ability to burn in the presence of oxygen

Boiling Point

The temperature at which a substance boils

Homogenous Mixture

A type of mixture in which the substances are so evenly distributed that it is difficult to distinguish one substance in the mixture from another; i.e. stainless steel spoon, salt water, soda

Atom

The smallest particle of an element

Viscosity

The tendency of a liquid to keep from flowing; resistance to flowing

Malleabrility

The ability of a solid to be hammered without shattering

Melting Point

The temperature at which a substance changes from a solid to a liquid

Colloid

A mixture that contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension; i.e. fog, milk

Precipitate

Any solid that forms and separates from a liquid mixture

Solution

A mixture that forms when substances dissolve and form a homogenous mixture; i.e. salt water, sugar water

Chemical Property

Any ability to produce a CHANGE IN THE COMPOSITION of matter

Physical Property

Any characteristic of a material that can be observed or measured WITHOUT CHANGING THE COMPOSITION of the substances in the material

Element

A substance that cannot be broken down into simpler substances; ie Gold (Au), aluminum (Al); Carbon (C)

Suspension

A heterogenous mixture that separates into layers over time

Pure substance

Matter that always has exactly the same composition; an element or a compound

Chemical Change

when a substance reacts and forms one or more new substances