Symbols, formula and equations - Single Award - CCEA test questions - CCEA Single Award - GCSE Combined Science Revision

1

Which is the correct formula for sodium oxide?

Na₂O

NaO

NaO₂

2

Which is the correct formula for magnesium nitride?

MgN

Mg₂N₃

Mg₃N₂

3

Which is the correct formula for sodium hydroxide?

Na(OH)

NaOH

Na(OH)₂

4

Which is the correct formula for ammonium carbonate?

NH₄CO₃

(NH₄)₂CO₃

NH₄(CO₃)₂

5

Which is the correct sequence of numbers to get the following equation to balance? _C₃H₈ + _O₂ → _CO₂ + _H₂O

1, 7, 3, 8

2, 8, 6, 8

1, 5, 3, 4

6

Which is the correct sequence of numbers to get the following equation to balance: _ Li + _N₂ → _Li ₃N

3, 1, 1

6, 1, 2

6, 1, 1

7

The half equation for the conversion of aluminium (III) ions to aluminium is:

Al³⁺ + 3e^- → Al

2Al³⁺ + 6e^- → Al₂

Al³⁺ → Al + 3e^-

8

How many atoms are represented by the formula Ca(No₃)₂?

3

7

9

Which of the balanced symbol equations is correct for the following word equation? calcium hydrogencarbonate + sulfuric acid → calcium sulfate + carbon dioxide + water

CaHCO₃ + H₂SO₄ → CaSO₄ + H₂O + CO₂

Ca(HCO)₃ + HSO₄ → CaSO₄ + H₂O + CO₂

Ca(HCO₃)₂ + H₂SO₄ → CaSO₄ + 2H₂O + 2CO₂

10

How many oxygen atoms are represented by the formula Al(OH)₃?

1

3

6