Pure Substances: Elements & Compounds

Which of the following are considered pure substances? Select TWO correct answers.

• element

• compound

• solution

• homogeneous mixture

• heterogeneous mixture

Which type of matter can be separated by physical means?

• atom

• element

• compound

• mixture

An element is a pure substance in which there are how many kinds of atoms?

• 2

• 4

• 3

• 1

Define a pure substance?

• A pure substance consists of a single type of particles and constant composition.

• A pure substance consists of two different types of particles with variable composition

• A pure substance consists of many types of particles and different composition

Which is the best example of pure substance?

• pizza

• saltwater

• air

• gold

Two or more different elements chemically combine to form compounds.

• True

• False

Tags

NGSS.MS-PS1-1

Both elements and compounds are pure substances.

• True

• False

Compounds have properties different from the elements that make it up.

• True

• False

This picture represents which of the following?

• element

• compound

Tags

NGSS.MS-PS1-1

Carbon is considered an element, while carbon dioxide is considered a compound. This is because carbon dioxide is ---

• a gas at room temperature.

• made of two different elements.

• given off by green plants.

• useful to human beings

Tags

NGSS.MS-PS1-1