Interpreting chromatograms | Starter Quiz | Oak National Academy

What is an element?

• a metal

• a compound

• a pure substance made of one kind of atom

• a mixture

Answer explanation

An element is a chemically pure substance made of one kind of atom.

True or false? All pure substances are elements.

• true

• false

Answer explanation

Elements can go through chemical reactions to form compounds. Compounds are considered pure chemical substances, along with elements.

True or false? If something is not pure, it is a mixture.

• true

• false

Answer explanation

Mixtures are made up of a mix of different chemical substances (e.g. air is a mix of chemicals like oxygen, nitrogen, water, carbon dioxide etc).

True or false? All mixtures can be separated into their individual components through physical processes.

• true

• false

Answer explanation

Physical processes can separate mixtures because the substances are not chemically bonded.

What is the purpose of chemical analysis?

• to break down substances

• to find out the composition of a substance

• to create new elements

• to study biological organisms

Answer explanation

Chemical analysis determines the composition of a substance.

Solubility is a measure of how well a substance can ___ in a solvent.

Answer explanation

Solubility is a measure of how well a substance can dissolve in a solvent.