Elements, Compounds, and Mixtures

Which describes a property of all elements?

• All elements are pure substances.

• All elements exist in the solid phase.

• All elements are metals.

Which combination of letters could be used as a chemical symbol for an element?

• BR

• Chl

• Dy

A student sees the diagram shown in a textbook.

What does the symbol in the diagram represent?

• a compound

• an element

• a molecule

Tags

NGSS.MS-PS1-1

Cake is an example of a(n):

• A. element

• B. compound

• C. mixture

H₂O is an example of a(n):

• A. element

• B. compound

• C. mixture

Tags

NGSS.MS-PS1-1

Au is an example of a(n):

• A. element

• B. compound

• C. mixture

When oxygen combines with hydrogen, which substance is formed?

• A. water

• B. vinegar

• C. hydrochloric acid

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is a chemical compound?

• aluminum

• carbonated water

• sodium chloride

Calcium carbonate (CaCO₃) is considered a compound because it is made up of two or more

• A. molecules

• B. elements

• C. gases

Tags

NGSS.MS-PS1-1

The symbol H represents which element

• A. Helium

• B. Oxygen

• C. Hydrogen