Chemistry WS 1 to go with Section 10.1
Chemical Reaction… coefficients, balancing
SKILLS:
Name _______________________________
Date ______________________Period ____
How many of each element is on both sides of the equation?
Coefficients
1.
How many of each element is in the following?
a. 2Al
b. 3Cl2
c. 2HCl
d. 3CuCO3
e.
4H20
2.
2K3PO4 + 3BaCl2 → Ba3(PO4)2 +
____ K = ____ K
____ P = ____ P
____ O = ____ O
____ Ba = ____ Ba
____ Cl = ____ Cl
Cd(NO3)2 +
6KCl
2NH4Cl →
CdCl2 + 2NH4NO3
____ Cd = ____ Cd
(you may do polyatomic ions separatelyas elements or as a group)
f.
5CO2
g. 3O2
h. 2ZnO
i. 4NaOH
j. 3SO2
k. 5Na2CO3
l. 4MgSO4
____ NO3 = ____ NO3
____ NH4 = ____ NH4
____ Cl = ____ Cl
3. (NH4)2CO3 + 2NaOH → Na2CO3 + 2NH3 + 2H2O
____ N = ____ N
____ H = ____ H
____ C = ____ C
____ O = ____ O
____ Na = ____ Na
4.
2Na3PO4 +
m. 6N2O5
n. 7CaSO3
5. Fe2(SO4)3 +
3Ba(OH)2 → 2Fe(OH)3 + 3BaSO4
____ Fe = ____ Fe
____ SO4 = ____ SO4
____ Ba = ____ Ba
____ OH = ____ OH
p. 2C12H22O11
6.
r. 2Al2(SO4)3
Zn3(PO4)2
____ Zn = ____ Zn
____ SO4 = ____ SO4
o. 3CuSO4 .. 3Cu, 3S, 12O
q. 3(NH4)3PO4
3ZnSO4 → 3Na2SO4 +
____ Na = ____ Na
____ PO4 = ____ PO4
C6H12O6 +
6O2 →
6CO2 +
____ C = ____ C
____ H = ____ H
____ O = ____ O
6H2O
SHOW YOUR SCRATCHWORK WHEN YOU BALANCE THESE EQUATIONS:
Rond’s suggestions: If there are polyatomic ions on both sides, figure them out as a group.
If an element if found in more than one place, leave until later.
Usually leave Oxygen and Hydrogen last
If a diatomic substance needs a odd number, double everything and then figure it out.
If You can’t balance one, skip it and come back to it. Sometimes later you can see the answer better.
1.
NaClO3
2.
Al +
→ NaCl + O2
Cl2 →
AlCl3
Cl2 →
3.
H2 +
4.
Ag + S8 →
Cr + CuSO4 →
12.
Ag2S
C3H6 + O2 → CO + H2O
6.
Ba + H2O →
7.
8.
H2 + CS2 →
9
10.
11.
CO +
CH4 +
17.
Ba(OH)2 + H2
Au2O3 →
Au + O2
O2 →
18.
19.
CH3OH
CO2 + H2O
20.
21.
22.
CO + H20
CaO + CO2
F2 →
15.
N2 +
16.
Fe + O2 →
Al +
FeO →
H2SO4 →
NF3
Fe2O3
Fe +
CO + Fe2O3 →
Al +
CH4 + H2S
H2 →
CaCO3 →
14.
Mg + H3PO4 → Mg3(PO4)2 + H2
5.
C3H8 + O2 →
13.
HCl
Cr2(SO4)3 + Cu
Fe + CO2
Al2(SO4)3 + H2
P4O10 + H20 →
Be + H2O →
Pb(NO3)2 →
Al2O3
H3PO4
Be(OH)2 + H2
PbO + NO2 + O2