Name:
Student Number:
CHEM 110 – Quiz 3 – 16 March 2012
For each of the following questions, circle the correct answer.
1.
2.
When aqueous solutions of AgNO3 and KI are mixed, the balanced net ionic equation is:
–
A.
Ag+(aq) + I (aq) → AgI(s)
B.
K+(aq) + NO3 (aq) → KNO3(s)
C.
Ag+(aq) + NO3 (aq) → AgNO3(s)
D.
AgNO3(aq) + KI(aq) → AgI(s) + KNO3(aq)
–
–
For the following equation indicate if a precipitate forms or not. Choose the correct option.
–
+
–
+
Na + Cl + NO3 + K →
3.
4.
–
+
A.
NaCl(s) + NO3 + K
B.
KCl(s) + Na + NO3
C.
KNO3(s) + Na + Cl
D.
no reaction
+
+
–
–
In which of the following is the oxidation number for the underlined element INCORRECT?
–
A.
MnO4 /(+7 )
B.
SO4 /(+4)
C.
NO3 /(+5)
D.
NH4 /(-3)
2–
–
+
Trace amounts of oxygen gas can be "scrubbed" from gases using the following reaction:
2+
+
3+
4Cr (aq) + O2(g) + 4H (aq) → 4Cr (aq) + 2H2O(l)
Choose the correct statement
A.
Oxygen gas is reduced to water.
B.
Cr (aq) is the oxidizing agent.
C.
O2(g) is the reducing agent.
D.
Electrons are transferred from O2 to Cr .
2+
2+
Name:
Student Number:
CHEM 110 – Quiz 3 – 14 March 2012
For each of the following questions, circle the correct answer.
1.
2.
3.
4.
Write the net ionic equation for the reaction of magnesium carbonate with nitric acid.
A.
MgCO3(s) + 2HNO3(aq) → Mg(NO3)2 (aq) + H2O + CO2(g)
B.
Mg (aq) + CO3 (aq) + 2H (aq) → Mg (aq) + H2O + CO2(g)
C.
MgCO3(s) + 2H (aq) → Mg (aq) + H2O + CO2(g)
D.
MgCO3(s) + 2HNO3(aq) → Mg(NO3)2(aq) + H2CO3(aq)
2+
2–
+
+
2+
2+
Which of the following pairs of aqueous solutions will give a precipitate when mixed?
A.
Sr(NO3)2 and KI
B.
AgNO3 and Ca(ClO4)2
C.
NaCl and K(CH3COO)
D.
Ca(OH)2 and H2SO4
In which of the following is the oxidation number for the underlined element INCORRECT?
A.
MnO2/(+4 )
B.
NO2 /(+3)
C.
ClO3 /(+7)
D.
Cr2O3/(+3)
–
–
Identify the reducing agent in the following reaction:
2NO2(g) + 7H2(g) → 2NH3(g) + 4H2O(g)
A.
NO2
B.
H2
C.
NH3
D.
H2O