Air Matters

The chemical formula for water is H₂O. What is the chemical formula for methane?

• O₂

• CO₂

• H₂O

• CH₄

The most abundant gas in the air is _______.

• xenon

• oxygen

• water

• nitrogen

The least abundant gas in the air is _______.

• xenon

• oxygen

• water

• nitrogen

Particles in the air move ____

• in an organized fashion

• freely

• slowly

• without hitting one another

Air is a __________.

• mixture of molecules and atoms

• mixture of only molecules

• gas made of only atoms

• constant composition

The largest component of air is Nitrogen, N₂. Is that an atom, compound, or molecule?

• atom

• compound

• molecule

Table salt, otherwise known as NaCl is composed of sodium and chlorine. Is it an atom, a compound, or a molecule?

• atom

• compound

• molecule

Which classification of matter can be separated using a filter?

• element

• compound

• mixture