3N3 Elements, Compounds, and Mixtures

Which of the following is an element?

• Sugar
• Salt
• Water
• Oxygen

A pure substance must be _____________.

• an element or a compound

• an element or a mixture

• a compound or a mixture

• a compound or a solution

Humans absorb oxygen from the air and exhale carbon dioxide, CO₂.

Carbon dioxide gas is _______________.

• an element of carbon and oxygen atoms

• a solution of carbon and oxygen atoms

• a compound of carbon and oxygen atoms

• a mixture of carbon and oxygen atoms

This picture shows a/an _____________.

• element

• compound

• mixture of elements

• mixture of compounds

This picture shows a/an _____________.

• element

• compound

• mixture of elements

• mixture of compounds

This picture shows a/an _____________.

• element

• compound

• mixture of elements

• mixture of compounds

This picture shows a/an _____________.

• element

• compound

• mixture of elements

• mixture of compounds

This picture shows a/an _____________.

• mixture of elements only

• mixture of compounds only

• mixture of elements and compounds

• none of the above

This picture shows a/an _____________.

• mixture of elements only

• mixture of compounds only

• mixture of elements and compounds

• none of the above

This picture shows a/an _____________.

• mixture of elements only

• mixture of compounds only

• mixture of elements and compounds

• none of the above