Chemistry assessment grade 10

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

A gas

• has a definite shape but no definite volume
• has a definite volume but no definite shape
• has fast-moving particles

Freezing

• Solid to gas

• Liquid to solid

• Gas to solid

Which state of matter has a definite shape?

• solid
• liquid
• gas

Particles of a liquid

• are tightly packed together and stay in a fixed position.

• are free to move around one another but still touch.

___________ are the smallest unit of an element that maintains the properties of that element.

• Atoms

• Elements

• Compounds

• Mixtures

An _______________ is made up of one or more of the same kind of atom chemically combined.

• atom

• element

• molecule

• compound

A _____________ contains a variety of elements and compounds that are not chemically combined with each other.

• compound

• element

• molecule

• mixture

A __________________ is a substance that has definite physical and chemical properties such as appearance, melting point, and reactivity.

• mixture

• pure substance

• compound

• element

A ______________ mixture is one that does not have a uniform composition.

• heterogeneous

• homogenous

• pure substance