Unit Test: Chemical Reactions
Moore
Name______________________
Period_______
1. Given the balanced equation with an unknown compound
represented by X:
Which compound is represented by X?
A) CH 3OH(aq)
C) CH 3CH 2OH(aq)
B) CH 2(OH)4(aq)
D) CH 2OHCH 2OH(aq)
2. Which chemical equation is correctly balanced?
A)
B)
C)
D)
H2(g) + O 2(g) ® H2O(g)
N2(g) + H 2(g) ® NH 3(g)
2NaCl(s) ® Na(s) + Cl2(g)
2KCl(s) ® 2K(s) + Cl 2(g)
7. Given the unbalanced equation:
__CaSO4 + __AlCl3®Al2(SO4)3 + __CaCl2
What is the coefficient of Al2(SO4)3 when the equation is
completely balanced using the smallest whole-number
coefficients?
A) 1
B) 2
C) 3
D) 4
8. Given the incomplete equation:
4Fe + 3O2
2X
Which compound is represented by X?
A) FeO
C) Fe 3O2
3. Given the unbalanced equation:
B) Fe2O 3
D) Fe 3O4
9. Given the balanced equation:
__Fe2O3 + __CO __Fe + __CO2
When the equation is correctly balanced using the
smallest whole-number coefficients, what is the
coefficient of CO?
A) 1
B) 2
C) 3
D) 4
2 Na + 2 H2O ® 2 X + H2
What is the correct formula for the product represented
by the letter X?
A) NaO
C) NaOH
4. Given the unbalanced equation:
B) Na2O
D) Na2OH
__Al + __CuSO4 ® __Al2(SO4)3 + __Cu
10. Given the balanced equation representing a
reaction:
When the equation is balanced using the smallest
whole-number coefficients, what is the coefficient of Al?
Zn(s) + H 2SO 4(aq) ® ZnSO 4(aq) + H 2(g)
A) 1
B) 2
C) 3
D) 4
Which type of reaction is represented by this equation?
5. Given the unbalanced equation:
A) decomposition
B) double replacement
C) single replacement D) synthesis
__ Al(s) + __O2(g) ® __Al2O3(s)
When this equation is correctly balanced using smallest
whole numbers, what is the coefficient of O2(g)?
A) 6
B) 2
C) 3
D) 4
6. Given the unbalanced equation:
__Na + __H2O ® __H2 + __NaOH
When the equation is correctly balanced using the
smallest whole-number coefficients, the coefficient for H
2O is
A) 1
B) 2
C) 3
D) 4
11. Which balanced equation represents a
single-replacement reaction?
A)
B)
C)
D)
Mg + 2AgNO3
Mg(NO 3) 2 + 2Ag
2Mg + O2
2MgO
MgCO 3
MgO + CO2
MgCl 2 + 2AgNO3
2AgCl + Mg(NO3)2
12. In which type of reaction do two or more substances
combine to produce a single substance?
A) synthesis
C) single replacement
B) decomposition
D) double replacement
13. Which equation represents a decomposition reaction?
A) CaCO3(s) ® CaO(s) + CO 2(g)
B) Cu(s) + 2AgNO 3(aq) ®
2Ag(s) + Cu(NO3) 2(aq)
C) 2H2(g) + O 2(g) ® 2H2O(l)
D) KOH(aq) + HCl(aq) ® KCl(aq) + H 2O(l)
19.
What type of reaction is shown above?
A) synthesis
C) single replacement
20.
14. Given the balanced equation representing a reaction:
4Al(s) + 3O 2(g) ® 2Al 2O3(s)
Which type of chemical reaction is represented by this
equation?
2 SO2(g) + O2(g) « 2 SO3(g)
F2(g) + CaBr2(g) = CaF2(g) + Br2(g)
What type of reaction is shown above?
A) synthesis
B) decomposition
C) single replacement D) double replacement
21.
Ba(NO3)2(aq) + Na2SO4(aq) ®
2 NaNO3(aq) + BaSO4(s)
A) double replacement B) single replacement
C) substitution
D) synthesis
15. Given the balanced equation:
2KClO 3 ® 2KCl + 3O 2
Which type of reaction is represented by this equation?
A) synthesis
C) single replacement
B) decomposition
D) double replacement
16. Given the balanced equation:
AgNO3(aq) + NaCl(aq)
NaNO3 (aq) + AgCl(s)
This reaction is classified as
A)
B)
C)
D)
synthesis
decomposition
single replacement
double replacement
17. Given the reaction:
Mg(s) + 2 AgNO3(aq) ® Mg(NO3) 2(aq) + 2 Ag(s)
Which type of reaction is represented?
A) single replacement B) double replacement
C) synthesis
D) decomposition
18. Which two solutions, when mixed together, will
undergo a double replacement reaction and form a
white, solid substance?
A)
B)
C)
D)
NaCl(aq) and LiNO3(aq)
KCl(aq) and AgNO 3(aq)
KCl(aq) and LiCl(aq)
NaNO3(aq) and AgNO 3(aq)
B) decomposition
D) double replacement
What type of reaction is shown above?
A)
B)
C)
D)
synthesis
decomposition
single replacement
double replacement
22. Which compound is insoluble in water?
A) calcium bromide
C) silver bromide
B) potassium bromide
D) sodium bromide
23. Which barium salt is insoluble in water?
A) BaCO3
C) Ba(ClO4) 2
B) BaCl2
D) Ba(NO 3) 2
24. According to Reference Table F, which of these
compounds is most soluble at 298 K and 1 atm?
A) AgNO3
C) PbCrO 4
B) AgCl
D) PbCO 3
25. Based on Reference Table F, which salt is least
soluble?
A) FeCO3
C) BaCl2
B) Na2CO 3
D) CaCl2
26. The attraction between water molecules and an Na + ion
or a Cl – ion occurs because water molecules are
A) linear
C) polar
B) symmetrical
D) nonpolar
27. The molarity of an aqueous solution of NaCl is defined
as the
A)
B)
C)
D)
grams of NaCl per liter of water
grams of NaCl per liter of solution
moles of NaCl per liter of water
moles of NaCl per liter of solution
28. The net ionic equation for the reaction between a
solution of lead (II) nitrate and a solution of potassium
chloride is
A)
B)
C)
D)
E)
Pb(s) + Cl2(g) ® PbCl 2(s)
Pb+ (aq) + Cl–(aq) ® PbCl(s)
Pb2+(aq) + 2 Cl–(aq) ® PbCl2(s)
Pb+ (aq) + 2 Cl–(aq) ® PbCl 2+ (s)
Pb2+(aq) + 2 Cl–(aq) ® 2 PbCl 2(s)
29. What is the net ionic equation for this reaction?
BaCl2(aq) + Na 2SO 4(aq) ®BaSO 4(s) + 2NaCl(aq)
A)
B)
C)
D)
Cl –(aq) + Na + (aq) ® NaCl(aq)
Cl 2–(aq) + 2 Na + (aq) ® 2 NaCl(aq)
Ba2+(aq) + SO 42–(aq) ® BaSO 4(s)
BaCl2(s) + Na2SO 4(s) ®
Ba2+(aq) + 2 Cl–(aq) + 2 Na+(aq) + SO42–
E) Ba2+(aq) + SO 42–(aq) + Cl–(aq) + Na + (aq) ®
BaSO4(s)
30. Which is the net ionic equation which properly
represents the reaction between ZnSO 4 and K3PO 4?
A) 3 Zn+2 + 3 SO 4–2 + 6 K+ + 2 PO 43– ®
Zn3(PO4) 2 + 6 K+ + 3 SO4 –
B) 3 ZnSO 4 + 2 K3PO 4 ® Zn3(PO4) 2 + 3 K2SO 4
C) 2 K+ + SO 4–2 ® K2SO 4
D) 3 Zn+2 + 2 PO 42– ® Zn3(PO4) 2
E) 3 Zn+2 + 3 SO 4–2 + 6K+ + 2 PO 43– ®
Zn3(PO4) 2
31. When the two aqueous solutions of CoCl 2 and NaOH
are mixed, a precipitate forms.
CoCl2(aq) + NaOH(aq) ® Precipitate + Ions
What is the formula of the precipitate?
A) NaCl
C) NaOH
E) NaCl2
B) CoCl2
D) Co(OH) 2
32. Which polyatomic ion combines with metallic ions to
form salts, all of which are soluble in water?
A) NO 3–
C) SO 42–
E) Cl –
B) NH 4+
D) CH 3COO–
33. Which is the correct net ionic equation for the reaction
between water solutions of ammonium sulfide, (NH4 ) 2
S, and lead (II) nitrate, Pb(NO 3) 2?
A) Pb2+(aq) + S2–(aq) ® PbS(s)
B) NH 4+ (aq) + NO3–(aq) ® NH 4NO 3(s)
C) 2 NH 4+ (aq) + S2–(aq) + Pb2+(aq) + 2NO3–(aq) ®
PbS(s) + 2 NH4+(aq) + 2 NO3–(aq)
D) 2 NH 4+ (aq) + S2–(aq) + Pb2+(aq) + 2 NO3–(aq) ®
2 NH4NO3(s) + S2–(aq) + Pb2+(aq)
E) 2 NH 4+ (aq) + S2–(aq) + Pb2+(aq) + 2 NO3–(aq) ®
PbS(s)
34. What is the net ionic equation for the reaction between
water solutions of potassium chloride, KCl, and silver
nitrate, AgNO 3?
A)
B)
C)
D)
K+ (aq) + NO3–(aq) ® KNO3(s)
K+ (aq) + NO3–(aq) ® K(s) + N 2(g) + O 2(g)
Ag+ (aq) + Cl–(aq) ® AgCl(s)
Ag+ (aq) + Cl–(aq) + K + (aq) + NO3–(aq) ®
Ag(s) + Cl2(g)
E) K+ (aq) + Cl–(aq) ® KCl(s)
35. Pure silver chloride, AgCl, can be obtained by mixing
solutions of 0.10 M Ag2SO 4, and 0.10 M
A)
B)
C)
D)
E)
barium chloride, BaCl 2
potassium chloride, KCl
calcium chlorate, Ca(ClO3) 2
sodium hypochlorite, NaClO
lead chloride, PbCl 2
Answer Key
Chemical Reactions
1.
C
2.
D
3.
C
4.
B
5.
C
6.
B
7.
A
8.
B
9.
C
10.
C
11.
A
12.
A
13.
A
14.
D
15.
B
16.
D
17.
A
18.
B
19.
A
20.
C
21.
D
22.
C
23.
A
24.
A
25.
A
26.
C
27.
D
28.
C
29.
C
30.
D
31.
D
32.
A
33.
A
34.
C
35.
B