Formulae and equations test questions - OCR 21st Century - GCSE Combined Science Revision

1

What is the correct symbol for the element copper?

Cu

Co

C

2

What is the correct symbol for the element sodium?

So

NA

Na

3

How many atoms of each element does a molecule of ammonia contain (NH₃)?

1 nitrogen atom and 3 hydrogen atoms

3 nitrogen atoms and 3 hydrogen atoms

1 nitrogen atom and 3 helium atoms

4

What is the formula for carbon dioxide?

CO

CO₂

CO₃

5

What is the formula for nitrogen monoxide?

NO

NO₂

NO₃

6

What is the formula for ethane? It contains 2 carbon atoms and 6 hydrogen atoms.

C₂H₆

2CH

c₂h₆

7

How many atoms of oxygen are in the reactants of this equation? CH₄ + 2O₂ → CO₂ + 2H₂O

1

2

4

8

How many atoms of oxygen are in the products of this equation? CH₄ + 2O₂ → CO₂ + 2H₂O

3

4

6

9

Which of these equations is balanced?

CH₄ + 2O₂ → CO₂ + 2H₂O

CH₄ + O₂ → CO₂ + 2H₂O

CH₄ + 2O₂ → 2CO₂ + 2H₂O

10

Which of these equations is balanced?

C₃H₈ + O₂ → 3CO₂ + H₂O

C₃H₈ + O₂ → 3CO₂ + 4H₂O

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O