Symbols, formula and equations

1

Which is the correct formula for sodium oxide?

2

Which is the correct formula for magnesium nitride?

3

Which is the correct formula for sodium hydroxide?

4

Which is the correct formula for ammonium carbonate?

5

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

6

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

7

The half equation for the conversion of copper(II) ions to copper is

8

Chlorine reacts with sodium iodide to form sodium chloride and iodine. Which of the following is the ionic equation for this reaction?

9

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