L2 CFU

U4 Lesson 2 Check for Understanding

Balancing Chemical Reactions

PART ONE: Write the word equations below as chemical equations & balance the reaction

1. Potassium chlorate when heated yields potassium chloride and oxygen gas K(CIO3) + Heat → KCI + O3

8. Aluminum reacts with hydrochloric acid to produce aluminum chloride and hydrogen gas 2 Al + 2 HCl → 2 AlCl + H2

.	reactants	products
aluminum	1 2	1 2
Hydrogen	1 2	2
Chlorine	1 2	1 2

PART TWO: Balance the following reactions 

1. 1 Na3PO4 + 3 KOH →   3 NaOH + 1 K3PO4

.	reactants	products
Na	3	1 3
PO4	1	1
K	1 3	3
OH	1 3	1 3

2. 1 MgF2 + 1 Li2CO3 →  1 MgCO3 + 2 LiF

.	reactants	products
Mg	1	1
F	2	1 2
Li	2	1 2
CO3	1	1

3. 1 P4 + 3 O2 →  2 P2O3

.	reactants	products
P	4	2 4
O	2 6	3 6

4. 2 RbNO3 + 1 BeF2 →  1 Be(NO3)2 + 2 RbF

.	reactants	products
Rb	1 2	1 2
NO3	1 2	2
Be	1	1
F	2	1 2

5. 2 AgNO3 + 1 Cu →  1 Cu(NO3)2 + 2 Ag

.	reactants	products
Ag	1 2	1 2
NO3	1 2	2
Cu	1	1

6. 1 CF4 + 2 Br2 → 1 CBr4 + 2 F2

.	reactants	products
C	1	1
Br	2 4	4
F	4	2 4

7. 2 HCN + 1 CuSO4 →  1 H2SO4 + 1 Cu(CN)2

.	reactants	products
CN	1 2	2
H	1 2	2
Cu	1	1
SO4	1	1

8. 1 GaF3 + 3 Cs →  3 CsF + 1 Ga

.	reactants	products
Ga	1	1
F	3	1 3
Cs	1 3	1 3

9. 1 BaS + 1 PtF2 →  1 BaF2 + 1 PtS

.	reactants	products
Ba	1	1
s	1	1
Pt	1	1
F	2	2

10. 1 N2 + 3 H2 →  2 NH3

.	reactants	products
N	2	1 2
H	2 6	3 6

11. 2 NaF + 1 Br2 →  2 NaBr + 1 F2

.	reactants	products
Na	1 2	1 2
F	1 2	2
Br	2	1 2

12. 1 Pb(OH)2 + 2 HCl →  2 HOH + 1 PbCl2

.	reactants	products
Pb	1	1
OH	2	1 2
H	1 2	1 2
Cl	1 2	2

13. 2 AlBr3 + 3 K2SO4 →  6 KBr + 1 Al2(SO4)3

.	reactants	products
Al	1 2	2
Br	3 6	1 6
K	2 6	1 6
SO4	1 3	3

14. 1 CH4 + 2 O2 →  1 CO2 + 2 H2O

.	reactants	products
C	1	1
H	4	2 4
O	2 4	3 4

15. 2 Na3PO4 + 3 CaCl2 →  6 NaCl + 1 Ca3(PO4)2

.	reactants	products
Na	3 6	1 6
PO4	1 2	2
Ca	1 3	3
Cl	2 6	1 6

16. 2 K + Cl2 →  2 KCl

.	reactants	products
K	1 2	1 2
Cl	2	1 2

17. 2 Al + 6 HCl →  3 H2 + 2 AlCl3

.	reactants	products
Al	1 2	1 2
H	1 6	2 6
Cl	1 6	3 6

18. 1 N2 + 3 F2 →  2 NF3

.	reactants	products
N	2	1 2
F	2 6	3 6