Download Fill in the blanks with the appropriate word, phrase, number, or unit.

Name (PRINT CLEARLY)
Exam 1 (100 points)
Seat Number
September 21, 2016
Chemistry 1303.002
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Fill in the blanks with the appropriate word, phrase, number, or unit.
1. (3 points) The mass of Mn (in grams) that is contained in 2.00 moles of Mn2O3 is ____________ g.
2.
(4 points)
The number of oxygen atoms in 1.500 moles of Ca3(PO4)2 is
.
3. (5 points) In the reaction 5 SO2 + 2 MnO4- + H2O → 5 SO42- + 2 Mn2+ + 4 H+, the oxidation
numbers of S and Mn in SO2 and MnO4- are
the reducing agent?
and
, respectively. Which of these is
.
4. (3 points) The molecular formula of a compound with the empirical formula HCO2 and a molecular
mass of 90.0 g/mole is
.
5. (3 points) The mass percentage of hydrogen in C3H8 is
.
6. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 250.0 mL of solution, the
molarity of hydroxide ions is _____________M.
[molar mass of Ba(OH)2, 171.3]
7. (4 points) Consider the species: NH3, CH3OH, H3PO4, Ba(OH)2, HNO3
Which is(are) both a strong acid and strong electrolyte?
Which is(are) a Bronsted base?
8. (4 points) Balance the following reaction by inspection:
(CN)2 +
9. (10 points) Write the formula for
aluminum sulfite
magnesium permanganate
ammonium thiocyanate
H2O →
H2C2O4 +
NH3
page 2
10. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then
(i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction.
(include states of all substances) [You do not need to show the full ionic equation.]
(a)
Cu(NO3)2 (aq) + Na3PO4 (aq)
(b)
KClO3 (aq) + NH4NO3 (aq) →
(c)
CH3COOH (aq) + Ba(OH)2 (aq) →
→
Molecular equation:
Net Ionic equation:
Molecular equation:
Net Ionic equation:
11.
(7 points) Calculate the final concentration of sodium sulfide, Na2S, when 75.0 mL of a 1.00 M
solution of Na2S is mixed with 50.0 mL of a 0.500 M solution of Na2S. SHOW ALL WORK and
UNITS LOGICALLY AND CLEARLY.
page 3
12. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses
are the numbers in small font just below the formulas on the reaction below.]
Fill in the unshaded boxes in the table below for a reaction in which 148.0 grams of H3PO4 is
produced and 55.2 grams of P4S10 remains unreacted.
CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to
locate each calculation.
No work; No units; No points!
P4S10
444.5
+
16 H2O
18.0
→
4 H3PO4
98.0
+
10 H2S
34.1
Initial
moles
moles
moles
Change
moles
moles
moles
Final
moles
moles
moles
moles
page 4
13.
a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a
mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of
Texas (268,601 square miles), how many moles of marshmallows would this be. Some
conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft;
1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY.
b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10
oz (ounces)?
c.
(3 points) If each marshmallow covering Texas was turned into a carbon atom, how many grams
of carbon would this be?
14. (10 points) Name the following compounds.
TiF3
SiCl4
K2O2
CaC2O4
Name (PRINT CLEARLY)
Exam 1 (100 points)
Seat Number
September 21, 2016
Chemistry 1303.002
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Fill in the blanks with the appropriate word, phrase, number, or unit.
1. (4 points) Balance the following reaction by inspection:
As4S6 +
O2 →
As4O6
+
SO2
2. (3 points) The molecular formula of a compound with the empirical formula H5C2O and a molecular
mass of 90.0 g/mole is
.
3. (4 points) Consider the species: H2CO3, HClO4, Ba(OH)2, C2H5OH, NH3
Which is(are) both a strong acid and strong electrolyte?
Which is(are) a Bronsted base?
4.
(3 points)
The mass percentage of carbon in C3H8 is
.
5. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 500.0 mL of solution, the
molarity of hydroxide ions is _____________M.
[molar mass of Ba(OH)2, 171.3]
6. (3 points) The mass of Mn (in grams) that is contained in 3.00 moles of Mn2O5 is ____________ g.
7.
(4 points)
The number of oxygen atoms in 2.500 moles of Mg3(PO4)2 is
8.
(5 points)
In the reaction 2 MnO4- + 5 SO2 + H2O → 5 SO42- + 2 Mn2+ + 4 H+, the oxidation
numbers of Mn and S in MnO4- and SO2 are
the oxidizing agent?
.
and
.
, respectively. Which of these is
page 2
9.
(14 points) TWO of the following reactions will occur in aqueous solution. Decide which
TWO and then (i) complete and balance the molecular reaction , and (ii) write the net ionic
equation for the reaction. (include states of all substances) [You do not need to show the full
ionic equation.]
(a) Pb(NO3)2 (aq) + KI (aq) →
(b) H2CO3 (aq) + KOH (aq) →
(c) NH4Br (aq) + Ba(ClO3)2 (aq)
→
Molecular equation:
Net Ionic equation:
Molecular equation:
Net Ionic equation:
10. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 50.0 mL of a 2.00 M solution
of Na2S is mixed with 100.0 mL of a 1.00 M solution of Na2S. SHOW ALL WORK and UNITS
LOGICALLY AND CLEARLY.
page 3
11. (10 points) Write the formula for
aluminum nitrite
sodium permanganate
ammonium thiosulfate
12. (10 points) Name the following compounds.
VCl4
BrF5
MgO2
K2C2O4
13.
a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a
mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of
Texas (268,601 square miles), how many moles of marshmallows would this be. Some
conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft;
1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY.
b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10
oz (ounces)?
c. (3 points) If each marshmallow covering Texas was turned into a carbon atom, how many grams
of carbon would this be?
page 4
14. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses
are the numbers in small font just below the formulas on the reaction below.]
Fill in the unshaded boxes in the table below for a reaction in which 184.0 grams of H3PO4 is
produced and 65.5 grams of P4S10 remains unreacted.
CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to
locate each calculation.
No work; No units; No points!
P4S10
444.5
+
16 H2O
18.0
→
4 H3PO4
98.0
+
10 H2S
34.1
Initial
moles
moles
moles
Change
moles
moles
moles
Final
moles
moles
moles
moles
Name (PRINT CLEARLY)
Exam 1 (100 points)
Seat Number
September 21, 2016
Chemistry 1303.002
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Fill in the blanks with the appropriate word, phrase, number, or unit.
1. (3 points) The mass percentage of hydrogen in C4H8 is
.
2.
(3 points)
The mass of Cr (in grams) that is contained in 2.00 moles of Cr2O3 is ____________ g.
3.
(4 points)
Balance the following reaction by inspection:
NH3 +
(CN)2
H2C2O4 →
4. (5 points) In the reaction 16 H+ + 2 MnO4-
+
H2O
+ 5 C2O42- → 2 Mn2+ + 10 CO2 + 8 H2O, the
oxidation numbers of Mn and C in MnO4- and C2O42- are
of these is the reducing agent?
and
, respectively. Which
.
5. (3 points) The molecular formula of a compound with the empirical formula HCO and a molecular mass
of 87.0 g/mole is
.
6. (4 points) The number of oxygen atoms in 4.00 moles of Ca3(PO4)2 is
7.
(4 points)
.
When 26.8 g of Ba(OH)2 is dissolved in enough water to make 250.0 mL of solution, the
molarity of hydroxide ions is _____________M.
[molar mass of Ba(OH)2, 171.3].
8. (4 points) Consider the species: C3H7OH, NH3, HF, H2SO4, Ba(OH)2
Which is(are) a Bronsted base?
Which is(are) both a strong acid and strong electrolyte?
page 2
9.
(14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then
(i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction.
(include states of all substances) [You do not need to show the full ionic equation.]
(a)
Cu(SO4)2 (aq)
+ NaHCO3 (aq) →
(b)
Pb(NO3)2 (aq) +
(c)
H3PO4 (aq) +
NH4Cl (aq) →
NaOH (aq)
→
Molecular equation:
Net Ionic equation:
Molecular equation:
Net Ionic equation:
10. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 25.0 mL of a 2.00 M solution
of Na2S is mixed with 50.0 mL of a 1.50 M solution of Na2S. SHOW ALL WORK and UNITS
LOGICALLY AND CLEARLY.
page 3
11. (10 points) Name the following compounds.
SF6
CaO2
Na2C2O4
TiCl4
12. (10 points) Write the formula for
potassium permanganate
magnesium thiosulfate
ammonium sulfite
13.
a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a
mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of
Texas (268,601 square miles), how many moles of marshmallows would this be. Some
conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft;
1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY.
b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10
oz (ounces)?
c.
(3 points) If each marshmallow covering Texas was turned into a carbon atom, how many grams
of carbon would this be?
page 4
14. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses
are the numbers in small font just below the formulas on the reaction below.]
Fill in the unshaded boxes in the table below for a reaction in which 219 grams of H3PO4 is
produced and 85.5 grams of P4S10 remains unreacted.
CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to
locate each calculation.
No work; No units; No points!
P4S10
444.5
+
16 H2O
18.0
→
4 H3PO4
98.0
+
10 H2S
34.1
Initial
moles
moles
moles
Change
moles
moles
moles
Final
moles
moles
moles
moles
Name (PRINT CLEARLY)
Exam 1 (100 points)
Seat Number
September 21, 2016
Chemistry 1303.002
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Fill in the blanks with the appropriate word, phrase, number, or unit.
1.
(4 points)
Consider the species: NH3, KOH, H3PO4, C2H5OH, H2SO4
Which is(are) a Bronsted base?
Which is(are) both a strong acid and strong electrolyte?
2. (4 points) Balance the following reaction by inspection:
As4O6
+
SO2 →
As4S6 +
O2
3. (4 points) The number of hydrogen atoms in 1.500 moles of (NH4)3PO4 is
.
4. (3 points) The molecular formula of a compound with the empirical formula HCO2 and a molecular
mass of 135.0 g/mole is
.
5. (3 points) The mass percentage of carbon in C2H6 is
.
6. (3 points) The mass of Mn (in grams) that is contained in 2.00 moles of Mn2O3 is
7. (5 points) In the reaction 16 H+ + 5 C2O42-
g.
+2 MnO4- → 2 Mn2+ + 10 CO2 + 8 H2O,
the oxidation numbers of C and Mn in C2O42- and MnO4- are
Which of these is the oxidizing agent?
and
, respectively.
.
8. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 500.0 mL of solution,
the molarity of hydroxide ions is _____________M.
[molar mass of Ba(OH)2, 171.3]
page 2
9.
(7 points)
Calculate the final concentration of sodium sulfide, Na2S, when 25.0 mL of a 1.00 M
solution of Na2S is mixed with 50.0 mL of a 0.500 M solution of Na2S. SHOW ALL WORK and
UNITS LOGICALLY AND CLEARLY.
.
10. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and
then (i) complete and balance the molecular reaction , and (ii) write the net ionic equation for
the reaction. (include states of all substances) [You do not need to show the full ionic equation.]
(a)
Ba(OH)2 (aq)
+
(b) NH4NO3 (aq) +
(c) K2S (aq)
Molecular equation:
Net Ionic equation:
Molecular equation:
Net Ionic equation:
CH3COOH (aq)
KClO3 (aq)
+ FeCl2 (aq)
→
→
→
page 3
11. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar
masses are the numbers in small font just below the formulas on the reaction below.]
Fill in the unshaded boxes in the table below for a reaction in which 448.0 grams of H3PO4 is
produced and 98.2 grams of P4S10 remains unreacted.
CLEARLY show your work in the space below the table. Make sure that it is easy for the
grader to locate each calculation.
No work; No units; No points!
P4S10
444.5
+
16 H2O
18.0
→
4 H3PO4
98.0
+
10 H2S
34.1
Initial
moles
moles
moles
Change
moles
moles
moles
Final
moles
moles
moles
moles
page 4
12.
(10 points)
Name the following compounds.
Na2Cr2O7
TiCl3
SF4
K2O2
13. (10 points) Write the formula for
calcium thiocyanate
aluminum permanganate
ammonium nitrite
14. a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a
mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state
of Texas (268,601 square miles), how many moles of marshmallows would this be. Some
conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft; 1
in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY.
b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10
oz (ounces)?
c.
If each marshmallow covering Texas was turned into a carbon atom, how many grams
of carbon would this be?
(3 points)
Name (PRINT CLEARLY)
Exam 1 (100 points)
Seat Number
September 21, 2016
Chemistry 1303.002
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Fill in the blanks with the appropriate word, phrase, number, or unit.
1. (3 points) The mass of Mn (in grams) that is contained in 2.00 moles of Mn2O3 is ____________ g.
2.
(4 points)
The number of oxygen atoms in 1.500 moles of Ca3(PO4)2 is
.
3. (5 points) In the reaction 5 SO2 + 2 MnO4- + H2O → 5 SO42- + 2 Mn2+ + 4 H+, the oxidation
numbers of S and Mn in SO2 and MnO4- are
the reducing agent?
and
, respectively. Which of these is
.
4. (3 points) The molecular formula of a compound with the empirical formula HCO2 and a molecular
mass of 90.0 g/mole is
.
5. (3 points) The mass percentage of hydrogen in C3H8 is
.
6. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 250.0 mL of solution, the
molarity of hydroxide ions is _____________M.
[molar mass of Ba(OH)2, 171.3]
7. (4 points) Consider the species: NH3, CH3OH, H3PO4, Ba(OH)2, HNO3
Which is(are) both a strong acid and strong electrolyte?
Which is(are) a Bronsted base?
8. (4 points) Balance the following reaction by inspection:
(CN)2 +
9. (10 points) Write the formula for
aluminum sulfite
magnesium permanganate
ammonium thiocyanate
H2O →
H2C2O4 +
NH3
page 2
10. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then
(i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction.
(include states of all substances) [You do not need to show the full ionic equation.]
(a)
Cu(NO3)2 + Na3PO4
(b)
KClO3 + NH4NO3 →
(c)
CH3COOH (aq) + Ba(OH)2 (aq) →
→
Molecular equation:
Net Ionic equation:
Molecular equation:
Net Ionic equation:
11.
(7 points) Calculate the final concentration of sodium sulfide, Na2S, when 75.0 mL of a 1.00 M
solution of Na2S is mixed with 50.0 mL of a 0.500 M solution of Na2S. SHOW ALL WORK and
UNITS LOGICALLY AND CLEARLY.
page 3
12. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses
are the numbers in small font just below the formulas on the reaction below.]
Fill in the unshaded boxes in the table below for a reaction in which 148.0 grams of H3PO4 is
produced and 55.2 grams of P4S10 remains unreacted.
CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to
locate each calculation.
No work; No units; No points!
P4S10
444.5
+
16 H2O
18.0
→
4 H3PO4
98.0
+
10 H2S
34.1
Initial
moles
moles
moles
Change
moles
moles
moles
Final
moles
moles
moles
moles
page 4
13.
a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a
mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of
Texas (268,601 square miles), how many moles of marshmallows would this be. Some
conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft;
1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY.
b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10
oz (ounces)?
c.
(3 points) If
each marshmallow covering Texas was turned into a carbon atoms, how many grams
of carbon would this be?
14. (10 points) Name the following compounds.
TiF3
SiCl4
K2O2
CaC2O4
Name (PRINT CLEARLY)
Exam 1 (100 points)
Seat Number
September 21, 2016
Chemistry 1303.002
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Fill in the blanks with the appropriate word, phrase, number, or unit.
1. (4 points) Balance the following reaction by inspection:
As4S6 +
O2 →
As4O6
+
SO2
2. (3 points) The molecular formula of a compound with the empirical formula H5C2O and a molecular
mass of 90.0 g/mole is
.
3. (4 points) Consider the species: H2CO3, HClO4, Ba(OH)2, C2H5OH, NH3
Which is(are) both a strong acid and strong electrolyte?
Which is(are) a Bronsted base?
4.
(3 points)
The mass percentage of carbon in C3H8 is
.
5. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 500.0 mL of solution, the
molarity of hydroxide ions is _____________M.
[molar mass of Ba(OH)2, 171.3]
6. (3 points) The mass of Mn (in grams) that is contained in 3.00 moles of Mn2O5 is ____________ g.
7.
(4 points)
The number of oxygen atoms in 2.500 moles of Mg3(PO4)2 is
8.
(5 points)
In the reaction 2 MnO4- + 5 SO2 + H2O → 5 SO42- + 2 Mn2+ + 4 H+, the oxidation
numbers of Mn and S in MnO4- and SO2 are
the oxidizing agent?
.
and
.
, respectively. Which of these is
page 2
9.
(14 points) TWO of the following reactions will occur in aqueous solution. Decide which
TWO and then (i) complete and balance the molecular reaction , and (ii) write the net ionic
equation for the reaction. (include states of all substances) [You do not need to show the full
ionic equation.]
(a) Pb(NO3)2 (aq) + KI (aq) →
(b) H2CO3 (aq) + KOH (aq) →
(c) NH4Br (aq) + Ba(ClO3)2 (aq)
→
Molecular equation:
Net Ionic equation:
Molecular equation:
Net Ionic equation:
10. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 50.0 mL of a 2.00 M solution
of Na2S is mixed with 100.0 mL of a 1.00 M solution of Na2S. SHOW ALL WORK and UNITS
LOGICALLY AND CLEARLY.
page 3
11. (10 points) Write the formula for
aluminum nitrite
sodium permanganate
ammonium thiosulfate
12. (10 points) Name the following compounds.
VCl4
BrF5
MgO2
K2C2O4
13.
a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a
mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of
Texas (268,601 square miles), how many moles of marshmallows would this be. Some
conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft;
1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY.
b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10
oz (ounces)?
c. (3 points) If each marshmallow covering Texas was turned into a carbon atoms, how many grams
of carbon would this be?
page 4
14. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses
are the numbers in small font just below the formulas on the reaction below.]
Fill in the unshaded boxes in the table below for a reaction in which 184.0 grams of H3PO4 is
produced and 65.5 grams of P4S10 remains unreacted.
CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to
locate each calculation.
No work; No units; No points!
P4S10
444.5
+
16 H2O
18.0
→
4 H3PO4
98.0
+
10 H2S
34.1
Initial
moles
moles
moles
Change
moles
moles
moles
Final
moles
moles
moles
moles
Name (PRINT CLEARLY)
Exam 1 (100 points)
Seat Number
September 21, 2016
Chemistry 1303.002
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Fill in the blanks with the appropriate word, phrase, number, or unit.
1. (3 points) The mass percentage of hydrogen in C4H8 is
.
2.
(3 points)
The mass of Cr (in grams) that is contained in 2.00 moles of Cr2O3 is ____________ g.
3.
(4 points)
Balance the following reaction by inspection:
NH3 +
(CN)2
H2C2O4 →
4. (5 points) In the reaction 16 H+ + 2 MnO4-
+
H2O
+ 5 C2O42- → 2 Mn2+ + 10 CO2 + 8 H2O, the
oxidation numbers of Mn and C in MnO4- and C2O42- are
of these is the reducing agent?
and
, respectively. Which
.
5. (3 points) The molecular formula of a compound with the empirical formula HCO and a molecular mass
of 87.0 g/mole is
.
6. (4 points) The number of oxygen atoms in 4.00 moles of Ca3(PO4)2 is
7.
(4 points)
.
When 26.8 g of Ba(OH)2 is dissolved in enough water to make 250.0 mL of solution, the
molarity of hydroxide ions is _____________M.
[molar mass of Ba(OH)2, 171.3].
8. (4 points) Consider the species: C3H7OH, NH3, HF, H2SO4, Ba(OH)2
Which is(are) a Bronsted base?
Which is(are) both a strong acid and strong electrolyte?
page 2
9.
(14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then
(i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction.
(include states of all substances) [You do not need to show the full ionic equation.]
(a)
Cu(SO4)2 + NaHCO3 →
(b)
Pb(NO3)2 (aq) +
(c)
H3PO4 (aq) +
NH4Cl (aq) →
NaOH (aq)
→
Molecular equation:
Net Ionic equation:
Molecular equation:
Net Ionic equation:
10. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 25.0 mL of a 2.00 M solution
of Na2S is mixed with 50.0 mL of a 1.50 M solution of Na2S. SHOW ALL WORK and UNITS
LOGICALLY AND CLEARLY.
page 3
11. (10 points) Name the following compounds.
SF6
CaO2
Na2C2O4
TiCl4
12. (10 points) Write the formula for
potassium permanganate
magnesium thiosulfate
ammonium sulfite
13.
a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a
mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of
Texas (268,601 square miles), how many moles of marshmallows would this be. Some
conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft;
1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY.
b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10
oz (ounces)?
c.
(3 points) If
each marshmallow covering Texas was turned into a carbon atoms, how many grams
of carbon would this be?
page 4
14. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses
are the numbers in small font just below the formulas on the reaction below.]
Fill in the unshaded boxes in the table below for a reaction in which 219 grams of H3PO4 is
produced and 85.5 grams of P4S10 remains unreacted.
CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to
locate each calculation.
No work; No units; No points!
P4S10
444.5
+
16 H2O
18.0
→
4 H3PO4
98.0
+
10 H2S
34.1
Initial
moles
moles
moles
Change
moles
moles
moles
Final
moles
moles
moles
moles
Name (PRINT CLEARLY)
Exam 1 (100 points)
Seat Number
September 21, 2016
Chemistry 1303.002
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
Fill in the blanks with the appropriate word, phrase, number, or unit.
1.
(4 points)
Consider the species: NH3, KOH, H3PO4, C2H5OH, H2SO4
Which is(are) a Bronsted base?
Which is(are) both a strong acid and strong electrolyte?
2. (4 points) Balance the following reaction by inspection:
As4O6
+
SO2 →
As4S6 +
O2
3. (4 points) The number of hydrogen atoms in 1.500 moles of (NH4)3PO4 is
.
4. (3 points) The molecular formula of a compound with the empirical formula HCO2 and a molecular
mass of 135.0 g/mole is
.
5. (3 points) The mass percentage of carbon in C2H6 is
.
6. (3 points) The mass of Mn (in grams) that is contained in 2.00 moles of Mn2O3 is
7. (5 points) In the reaction 16 H+ + 5 C2O42-
g.
+2 MnO4- → 2 Mn2+ + 10 CO2 + 8 H2O,
the oxidation numbers of C and Mn in C2O42- and MnO4- are
Which of these is the oxidizing agent?
and
, respectively.
.
8. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 500.0 mL of solution,
the molarity of hydroxide ions is _____________M.
[molar mass of Ba(OH)2, 171.3]
page 2
9.
(7 points)
Calculate the final concentration of sodium sulfide, Na2S, when 25.0 mL of a 1.00 M
solution of Na2S is mixed with 50.0 mL of a 0.500 M solution of Na2S. SHOW ALL WORK and
UNITS LOGICALLY AND CLEARLY.
.
10. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and
then (i) complete and balance the molecular reaction , and (ii) write the net ionic equation for
the reaction. (include states of all substances) [You do not need to show the full ionic equation.]
(a)
Ba(OH)2 (aq)
(b) NH4NO3 +
(c) K2S (aq)
Molecular equation:
Net Ionic equation:
Molecular equation:
Net Ionic equation:
+
CH3COOH (aq)
KClO3
→
+ FeCl2 (aq)
→
→
page 3
11. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar
masses are the numbers in small font just below the formulas on the reaction below.]
Fill in the unshaded boxes in the table below for a reaction in which 448.0 grams of H3PO4 is
produced and 98.2 grams of P4S10 remains unreacted.
CLEARLY show your work in the space below the table. Make sure that it is easy for the
grader to locate each calculation.
No work; No units; No points!
P4S10
444.5
+
16 H2O
18.0
→
4 H3PO4
98.0
+
10 H2S
34.1
Initial
moles
moles
moles
Change
moles
moles
moles
Final
moles
moles
moles
moles
page 4
12.
(10 points)
Name the following compounds.
Na2Cr2O7
TiCl3
SF4
K2O2
13. (10 points) Write the formula for
calcium thiocyanate
aluminum permanganate
ammonium nitrite
14. a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a
mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state
of Texas (268,601 square miles), how many moles of marshmallows would this be. Some
conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft; 1
in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY.
b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10
oz (ounces)?
c.
If each marshmallow covering Texas was turned into a carbon atoms, how many
grams of carbon would this be?
(3 points)