2.1 and 2.2 pre-test

A gas is a form of matter that

• has a definite volume.

• is generally a liquid or solid at room temperature.

• takes the shape of its container.

• is difficult to compress.

Homogeneous mixtures

• are always liquids.

• consist of two or more phases.

• have a composition that is fixed.

• are known as solutions.

Physical properties of a substance include

• color and odor.

• malleability.

• melting and boiling points.

• all of them.

All of the following are general characteristics of a substance in the liquid state except

• definite volume.

• not easily compressed.

• able to flow.

• definite shape.

Amount of matter that an object contains

• volume

• density

• mass

• luster

The simplest form of matter with a unique set of properties

• mixture.

• element.

Changing a substance without changing its composition

• chemical chanbge.

• physical change.

A heterogeneous mixture consists of two or more phases.

• always true

• always false

• sometime true

• sometime false

A vapor is a gaseous substance that is generally a liquid at room temperature.

• always false

• sometimes true

• always true

• sometimes false

Examples of physical changes include (choose all that apply)

• freezing and melting.

• cutting and grinding.

• burning.

• all answers are correct