Balancing Chemical Equations

Gapfill exercise

Enter your answers in the gaps. Every space will require a coefficient. Unlike when we balance equations in class, you will have to include coefficients of "one" by typing in a value of "1." When you have entered all the answers, click on the "Check" button.

1.       H2 + O2 → H2O

2.       H2 + N2 → NH3

3.       Al2O3 → Al + O2

4.       KClO3 → KCl + O2

5.       S8 + O2 → SO2

6.       C2H6 + O2 → CO2 + H2O

7.       Al2(SO4)3 + Ca(OH)2 → Al(OH)3 + CaSO4

8.       P4 + O2 → P2O5

9.       Ag + S8 → Ag2S

10.       Al + Br2 → AlBr3

11.       Cr + O2 → Cr2O3

12.       NaClO3 → NaCl + O2

13.       AlBr3 + Cl2 → AlCl3 + Br2

14.       Na + H2O → NaOH + H2

15.       AlI3 + HgCl2 → AlCl3 + HgI2

16.       Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O

17.       AgNO3 + K3PO4 → Ag3PO4 + KNO3

18.       C3H8 + O2 → CO2 + H2O

19.       C2H2 + O2 → CO2 + H2O

20.       C6H6 + O2 → CO2 + H2O