Pure Substances and Mixtures

Pure substances include both:

• Elements

• Homogeneous Mixtures

• Compounds

• Heterogeneous Mixtures

An element is?

• Chemically combined

• Pure substances that can be broken down

• Pure substances that cannot be broken down into simpler substances

• One or more elements chemically combined.

A compound is?

• Chemically combined

• Pure substances that can be broken down

• Pure substances that cannot be broken down into simpler substances

• One or more elements chemically combined.

Oxygen

• Element

• Compound

Tags

NGSS.MS-PS1-1

Water

• Element

• Compound

Tags

NGSS.MS-PS1-1

Mixtures

• chemically combined

• composed of two or more types of matter that can be present in varying amounts

• One or more elements chemically combined

• can be separated by physical changes

Salt

• Mixture

• Compound

Tags

NGSS.MS-PS1-1

Saltwater

• Mixture

• Compound

Sand

• Mixture

• Compound

Heterogeneous mixture

• A mixture with a composition that varies from point to point and differences can be easily seen

• A mixture with a uniform composition and appears visually the same throughout