Elements, Compounds & Mixtures

True or false: Air is a mixture.

• true

• false

Which of the following is a mixture?

• oxygen

• gold

• sand

• water

A pure substance...

• is an element or a compound

• is an element or a mixture

• is a compound or a mixture

• is a mixture

A substance made up of two or more chemically combined elements is —

• an element

• mixture

• compound

• solution

A substance made of only one type of atom is called —

• an element

• a mixture

• a compound

• a salt

Table salt, or sodium chloride has the chemical formula NaCl. How is sodium chloride classified?

• as an element

• . as a compound

• as a mixture

• as a liquid

NaHCO₃ is an example of —

• an abbreviation

• a compound

• a mixture

• an element

Brass is a metal that is bright red and gold. It is formed by combining, not chemically, two elements, zinc and copper. Based on the information, how would brass be classified?

• an element

• compound

• mixture

• suspension

Classify the picture with the correct label.

• Element

• Compound

• Mixture of Elements

• Mixture of Compounds

Tags

NGSS.MS-PS1-1

This picture represents which of the following?

• A single element

• Mixture of molecules

• mixture of atoms

• mixture of compounds

Tags

NGSS.MS-PS1-1