9. Chemical formulae (Y7)

Which elements are in this compound?

H₂O

• helium and oxide

• hydrogen and oxygen

• water

• waterium and oxygen

Which elements are in this compound?

CuSO₄

• cuperium, sodium and oxygen

• copper sulfate

• copper, sulfur and oxygen

• carbon, sodium and oxygen

Which chemical formula contains the following elements:

carbon, hydrogen and oxygen?

• CH₄

• Na₂SO₄

• C₂H₅OH

• CO₂

Which chemical formula contains the following elements:

zinc, sulfur and oxygen?

• ZnSO₄

• Na₂SO₄

• ZnO

• FeCl₃

How many atoms of oxygen does copper sulfate (CuSO₄) contain?

• 1

• 2

• 3

• 4

How many atoms of iron does iron oxide (Fe₂O₃) contain?

• 1

• 2

• 3

• 5

How many atoms of sodium does sodium carbonate (Na₂CO₃) contain?

• 1

• 2

• 3

• 5

How many atoms of nitrogen does sodium nitrate (NaNO₃) contain?

• 1

• 2

• 3

• 5