Formulae and equations - OCR 21C

1

What is the correct symbol for the element copper?

2

What is the correct symbol for the element sodium?

3

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

4

What is the formula for carbon dioxide?

5

What is the formula for nitrogen monoxide?

6

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

7

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

8

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

9

Which of these equations is balanced?

10

Which of these equations is balanced?