Quiz on Elements and Compounds

Which of the following is an element?

• Water

• Salt

• Oxygen

• Sugar

Which of these is a compound?

• Hydrogen

• Carbon dioxide

• Gold

• Iron

A mixture is made by:

• Chemically joining substances

• Burning substances

• Physically combining substances

• Freezing substances

Which of the following is a mixture?

• Pure water

• Air

• Carbon dioxide

• Salt

Which of the following is a molecule of an element?

• O₂

• CO₂

• H₂O

• NaCl

What is a molecule?

• A single atom

• A group of atoms bonded together

• A type of rock

• A large machine

Water (H₂O) is an example of a:

• Molecule of an element

• Mixture

• Molecule of a compound

• Element

Which of the following is made of only one kind of atom?

• Sugar

• Salt

• Iron

• Water

Which one of these is not a compound?

• H₂O

• NaCl

• O₂

• CO₂

When two or more elements combine chemically, they form a:

• Mixture

• Compound

• Molecule of element

• Atom