Worksheet:
Chemical Equations & Double-displacement Reactions
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) The following reaction: A) Decomposition
C) Single-displacement
Br2 + 2KI → I2 + 2KBr, is an example of
B) Combination
D) Double-displacement
1)
c
2) The following reaction: A) Combination
C) Single-displacement
Ca(OH) 2 + HCl → CaCl2 + 2H 2 O, is an example of
B) Double-displacement
D) Decomposition
2)
b
3) The following reaction: 2H2 + O 2 → 2H 2 O, is an example of
B) Double-displacement
D) Decomposition
3)
a
CuCO 3 → CuO + CO2 , is an example of
4)
b
5) The activity series are as follows (ranking with diminishing reactivities):
Metal (losing electrons): K > Ca > Na > Mg > Al > Zn > Fe > Ni > Sn > Pb > (H) > Cu > Ag > Hg
> Au
Which one of the following single-displacement reactions will occur? (Remember HELI)
A) Ag + FeCl2
B) Al + CuCl2
C) Au + CuCl2
D) Ag + CuCl2
5)
b
6) With which one of the following ions will Fe2+ combine to form an insoluble salt?
A) NO3 -
6)
A) Combination
C) Single-displacement
4) The following reaction: A) Combination
C) Double-displacement
B) Decomposition
D) Single-displacement
c
B) SO4 2C) CO3 2D) ClE) None of the above
PROBLEMS. Show work with proper Significant Figures and Units to receive credit.
7) Salts of some anions are generally poorly soluble. List at least SIX anions that give usually insoluble
compounds:
hydroxide, phosphate, carbonate, sulfite, sulfide, phosphite,
chromate,
_______________________________________________________________________________
1
8) A. Balance the following chemical equations: (no work is required)
1
1
2
4
8
2
____ SO
2Cl2 + ____ HI → ____ H
2S + ____ H2O + ____ HCl
+ ____ I2
hint: balance S, O first, then H, finally I
11
12
2
1
____ C
6H11NO2 + ____ O2 → ____ CO2 + ____ H2O + ____ N2
hint: balance C, H, N first.
2
3
1
2
____ (NH
4)3PO4 + ____ Al2(SO4)3 → ____ AlPO
4 + ____ (NH4)2SO4
ALL numbers are actually subscripts in the formulas:
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
9) Complete and Balance the following double-displacement reaction
3
2 3PO4 (aq) + ____ Mg(NO 3 )2(aq) → ____ Na
9)
6 NaNO3 + Mg3(PO4)2(s)
Predict the reaction as
A) Gas-evolving Reaction
C) No Reaction
B) Precipitation Reaction
D) Acid-base neutralization
10) Complete and Balance the following double-displacement reaction
1
2
____ HClO
4 (aq) + ____ Na2 CO3 (aq) → H2O
+ CO2(g) +
Predict the reaction as
A) Acid-base neutralization
C) No Reaction
10)
D
11)
C
2 NaClO4
B) Precipitation Reaction
D) Gas-evolving Reaction
11) Complete and Balance the following double-displacement reaction
1
2
____ Mn(OH)
2 (s) + ____ HBr(aq) → B
2H2O + MnBr2
Predict the reaction as
A) Gas-evolving Reaction
C) Acid-base neutralization
B) Precipitation Reaction
D) No Reaction
2