Question 1

Iron metal reacts with chlorine gas as follows:
2 Fe(s)+ 3 Cl2(g)→ 2 FeCl3(s)
How many moles of FeCl3 are obtained when 4.6 mol of Cl2 reacts with excess Fe?

Accepted Answer

A) 3.1 mol 
B) 4.6 mol 
C) 1.5 mol 
D) 2.3 mol 
E) 6.9 mol

Question 2

When silver nitrate reacts with barium chloride,silver chloride and barium nitrate are formed.How many grams of silver chloride are formed when 10.0 g of silver nitrate reacts with 15.0 g of barium chloride?

Accepted Answer

A) 8.44 g 
B) 9.40 g 
C) 11.9 g 
D) 18.8 g

Question 3

One source of iodine is sodium iodate.Iodine is produced by a series of reactions.The first reaction is a reduction reaction with sodium hydrogen sulfite.
IO3- (aq)+ 3 HSO3- (aq)→ I- (aq)+ 3 SO42- (aq)+ 3 H+ (aq)
5 I- (aq)+ IO3- (aq)+ 6 H+ (aq)→ 3 I2(s)+ 3 H2O
How many grams of iodine are produced from 1.00 × 102 grams of NaHSO3?

Accepted Answer

A) 81.3 g 
B) 243 g 
C) 62.6 g 
D) 48.8 g 
E) 205 g

Question 4

If the percent yield for the following reaction is 65.0%,how many grams of KClO3 are needed to produce 32.0 g of O2?
2 KClO3(s)→ 2 KCl(s)+ 3 O2(g)

Accepted Answer

A) 53.1 g 
B) 81.7 g 
C) 126 g 
D) 283 g

Question 5

What is the sum of the coefficients when the following equation is balanced with the smallest integer coefficients?
H2SO3 + Al(OH)3 → Al2(SO3)3 + H2O

Accepted Answer

A) 4 
B) 5 
C) 11 
D) 12 
E) 14

Question 6

For the reaction 
The stoichiometric number for Al2O3 is:

Accepted Answer

A) +2 
B) +1 
C) -1 
D) -2 
E) 0

Question 7

The chemical reaction occurring during the discharge of a lead storage battery can be represented by the equation: 
What mass of lead sulfate would result from the complete reaction of 41.4 g of lead?

Accepted Answer

A) 57.6 g 
B) 60.5 g 
C) 105 g 
D) 115 g 
E) 121 g

Question 8

If the reaction of phosphate ion with water is ignored,what is the total concentration of ions in a solution prepared by dissolving 3.00 g of K3PO4 in enough water to make 350 mL of solution?

Accepted Answer

A) 0.0101 mol L-1 
B) 0.0404 mol L-1 
C) 0.162 mol L-1 
D) 0.323 mol L-1

Question 9

What thickness (in cm)is the silicon block (density = 2.33 g/cm3)that is 2.87 cm wide and long necessary to react with 91.3 g of Cr2O3 by the reaction: 3 Si (s)+ 2 Cr2O3 (s)→ 3 SiO2 (s)+ 4 Cr (l)?

Accepted Answer

A) 2.05 cm 
B) 1.32 cm 
C) 3.08 cm 
D) 8.98 cm 
E) 3.79 cm

Question 10

52.5 mL of a solution were diluted to a volume of 6.25 L and then had a concentration of 3.16 M.What was the molarity of the initial solution?

Accepted Answer

A) 3.16(52.5/6.25)M 
B) 3.16(6.25/52.5)M 
C) (3.16)(52.5)(6.25)M 
D) 3.16(52.5/6250)M 
E) (6.25)(3.16)/0.0525 M

Exam 4: Chemical Reactions

Iron metal reacts with chlorine gas as follows: 2 Fe(s) + 3 Cl₂(g) → 2 FeCl₃(s) How many moles of FeCl₃ are obtained when 4.6 mol of Cl₂ reacts with excess Fe?

When silver nitrate reacts with barium chloride,silver chloride and barium nitrate are formed.How many grams of silver chloride are formed when 10.0 g of silver nitrate reacts with 15.0 g of barium chloride?

If the percent yield for the following reaction is 65.0%,how many grams of KClO₃ are needed to produce 32.0 g of O₂? 2 KClO₃(s) → 2 KCl(s) + 3 O₂(g)

What is the sum of the coefficients when the following equation is balanced with the smallest integer coefficients? H₂SO₃ + Al(OH) ₃ → Al₂(SO₃) ₃ + H₂O

For the reaction The stoichiometric number for Al₂O₃ is:

The chemical reaction occurring during the discharge of a lead storage battery can be represented by the equation: What mass of lead sulfate would result from the complete reaction of 41.4 g of lead?

If the reaction of phosphate ion with water is ignored,what is the total concentration of ions in a solution prepared by dissolving 3.00 g of K₃PO₄ in enough water to make 350 mL of solution?

What thickness (in cm) is the silicon block (density = 2.33 g/cm³) that is 2.87 cm wide and long necessary to react with 91.3 g of Cr₂O₃ by the reaction: 3 Si (s) + 2 Cr₂O₃(s) → 3 SiO₂(s) + 4 Cr (l) ?

52.5 mL of a solution were diluted to a volume of 6.25 L and then had a concentration of 3.16 M.What was the molarity of the initial solution?

Exam 4: Chemical Reactions

Iron metal reacts with chlorine gas as follows: 2 Fe(s) + 3 Cl2(g) → 2 FeCl3(s) How many moles of FeCl3 are obtained when 4.6 mol of Cl2 reacts with excess Fe?

When silver nitrate reacts with barium chloride,silver chloride and barium nitrate are formed.How many grams of silver chloride are formed when 10.0 g of silver nitrate reacts with 15.0 g of barium chloride?

If the percent yield for the following reaction is 65.0%,how many grams of KClO3 are needed to produce 32.0 g of O2? 2 KClO3(s) → 2 KCl(s) + 3 O2(g)

What is the sum of the coefficients when the following equation is balanced with the smallest integer coefficients? H2SO3 + Al(OH) 3 → Al2(SO3) 3 + H2O

For the reaction The stoichiometric number for Al2O3 is:

The chemical reaction occurring during the discharge of a lead storage battery can be represented by the equation: What mass of lead sulfate would result from the complete reaction of 41.4 g of lead?

If the reaction of phosphate ion with water is ignored,what is the total concentration of ions in a solution prepared by dissolving 3.00 g of K3PO4 in enough water to make 350 mL of solution?

What thickness (in cm) is the silicon block (density = 2.33 g/cm3) that is 2.87 cm wide and long necessary to react with 91.3 g of Cr2O3 by the reaction: 3 Si (s) + 2 Cr2O3 (s) → 3 SiO2 (s) + 4 Cr (l) ?

52.5 mL of a solution were diluted to a volume of 6.25 L and then had a concentration of 3.16 M.What was the molarity of the initial solution?

Iron metal reacts with chlorine gas as follows: 2 Fe(s) + 3 Cl₂(g) → 2 FeCl₃(s) How many moles of FeCl₃ are obtained when 4.6 mol of Cl₂ reacts with excess Fe?

If the percent yield for the following reaction is 65.0%,how many grams of KClO₃ are needed to produce 32.0 g of O₂? 2 KClO₃(s) → 2 KCl(s) + 3 O₂(g)

What is the sum of the coefficients when the following equation is balanced with the smallest integer coefficients? H₂SO₃ + Al(OH) ₃ → Al₂(SO₃) ₃ + H₂O

For the reaction The stoichiometric number for Al₂O₃ is:

If the reaction of phosphate ion with water is ignored,what is the total concentration of ions in a solution prepared by dissolving 3.00 g of K₃PO₄ in enough water to make 350 mL of solution?

What thickness (in cm) is the silicon block (density = 2.33 g/cm³) that is 2.87 cm wide and long necessary to react with 91.3 g of Cr₂O₃ by the reaction: 3 Si (s) + 2 Cr₂O₃(s) → 3 SiO₂(s) + 4 Cr (l) ?