Question 1

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
Na + HCl → NaCl + H2

Accepted Answer

A) 7 
B) 4 
C) 2 
D) 10 
E) 9

Question 2

What is the concentration (M)of CH₃OH in a solution prepared by dissolving 16.8 g of CH₃OH in sufficient water to give exactly 230 mL of solution?

Accepted Answer

The answer of What is the concentration (M)of CH₃OH in...

Question 3

How many moles of Co²⁺ (aq)are present in 0.150 L of a 0.200 mol L^-1 solution of CoI₂(aq)?

Accepted Answer

The answer of How many moles of Co²⁺ (aq)are present...

Question 4

Identify the coefficient of I2(s)when the following reaction is balanced,and determine the number of moles of iodine that reacts with 30.0 g of aluminum.
(unbalanced)Al(s)+ I2(s)→ Al2I6(s)

Accepted Answer

A) coefficient 1,amount 0.741 mol 
B) coefficient 3,amount 1.67 mol 
C) coefficient 2,amount 2.22 mol 
D) coefficient 4,amount 3.33 mol

Question 5

What volume of 2.0 M HCl,in mL,is required to dissolve a 10.0 g piece of Zn?
Zn(s)+ 2 HCl → ZnCl2 + H2(g)

Accepted Answer

A) 76 mL 
B) 330 mL 
C) 170 mL 
D) 310 mL 
E) 150 mL

Question 6

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 if each reaction has a 95.0% yield?

Accepted Answer

A) 48.8 g 
B) 51.4 g 
C) 185 g 
D) 46.3 g 
E) 44.0 g

Question 7

A 1.900 g sample of C6H12 is burned in an excess of oxygen.What mass of CO2 and H2O should be obtained?

Accepted Answer

A) 0.994 g CO2,0.407 g H2O 
B) 2.98 g CO2,1.22 g H2O 
C) 5.96 g CO2,2.44 g H2O 
D) 10.45 g CO2,4.27 g G H2O 
E) 5.23 g CO2,2.38 g H2O

Question 8

For the reaction symbolized as HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H2O(l)water is both:

Accepted Answer

A) a reactant and the solute 
B) a reactant and the solvent 
C) a product and the solute 
D) a product and the solvent 
E) a liquid and the intermediate

Question 9

If 100.mL of 0.400 mol L-1 Na2SO4(aq)is added to 200 mL of 0.600 mol L-1 NaCl(aq),what is the concentration of Na+ ions in the final solution? Assume that the volumes are additive.

Accepted Answer

A) 0.534 mol L-1 
B) 0.667 mol L-1 
C) 1.00 mol L-1 
D) 1.40 mol L-1

Question 10

The chemical reaction occurring during the discharge of a lead storage battery can be represented by the equation:
Pb(s)+ PbO2(s)+2 H2SO4(aq)→ 2 PbSO4(s)+ 2 H2O(l)
Which is the limiting reagent and the amount of PbSO4 produced if 53.0 g of Pb,77.3 g of PbO2, and 534 mL of 0.544 M solution of H2SO4 is used?

Accepted Answer

A) limiting reagent PbO2,196 g PbSO4 
B) limiting reagent Pb,77.6 g PbSO4 
C) limiting reagent Pb,155 g PbSO4 
D) limiting reagent H2SO4,88.1 g PbSO4 
E) limiting reagent H2SO4,176 g PbSO4

Question 11

What is the molar concentration of sodium ions in a 0.450 mol L-1 Na3PO4(aq)solution?

Accepted Answer

A) 0.150 mol L-1 
B) 0.450 mol L-1 
C) 1.35 mol L-1 
D) 1.80 mol L-1

Question 12

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide:
2 Mg(s)+ O2(g)→ 2 MgO(s)
When 4.00 g of magnesium burns,what is the theoretical yield of magnesium oxide?

Accepted Answer

A) 4.00 g 
B) 6.63 g 
C) 0.165 g 
D) 3.32 g 
E) 13.3 g

Question 13

How many grams of calcium chloride are needed to produce 1.50 g of potassium chloride?
CaCl2(aq)+ K2CO3(aq)→ 2 KCl(aq)+ CaCO3(aq)

Accepted Answer

A) 0.896 g 
B) 1.12 g 
C) 2.23 g 
D) 4.47 g

Question 14

A FeCl3 solution is 0.175 mol L-1.How many mL of a 0.175 mol L-1 FeCl3 solution are needed to make 550 mL of a solution that is 0.300 mol L-1 in Cl- ion?

Accepted Answer

A) 0.943 mL 
B) 314 mL 
C) 943 mL 
D) 0.314 mL

Question 15

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
CH3OH → CO + H2

Accepted Answer

A) 3 
B) 8 
C) 5 
D) 4 
E) 7

Question 16

How many grams of ZnSO4 will be made from 41.0 grams each of Zn,K2Cr2O7,and H2SO4?
4 Zn + K2Cr2O7 + 7 H2SO4 → 4 ZnSO4 + 2 CrSO4 + K2SO4 + 7 H2O

Accepted Answer

A) 67.6 g 
B) 38.6 g 
C) 101 g 
D) 20.6 g 
E) 82.5 g

Question 17

Lithium and nitrogen react to produce lithium nitride:
6 Li(s) + N2(g) → 2 Li3N(s)
How many moles of lithium nitride are produced when 0.450 mol of lithium react in this fashion?

Accepted Answer

A) 0.150 
B) 0.900 
C) 0.0750 
D) 1.35 
E) 0.225

Question 18

Given the following reaction:
Na2SO4(s)+ 2 C(s)→ Na2S(s)+ 2 CO2(g)
How many grams of carbon are required to produce 18.4 g Na2S(s)?

Accepted Answer

A) 11.3 g 
B) 5.66 g 
C) 2.83 g 
D) 239 g 
E) 142 g

Question 19

What is the concentration of NO3- ions in a solution prepared by dissolving 25.0 g of Ca(NO3)2 in enough water to produce 300 mL of solution?

Accepted Answer

A) 0.254 mol L-1 
B) 0.508 mol L-1 
C) 0.672 mol L-1 
D) 1.02 mol L-1

Question 20

The chemical reaction during low current discharge of a simple "dry cell" involves:
(unbalanced)Zn + MnO2 + NH4Cl → ZnCl2 + Mn2O3 + NH3 + H2O
What is the coefficient for zinc in the balanced equation that uses the lowest whole number ratios,and what is the limiting reagent for a process in which equal masses of reactants are mixed?

Accepted Answer

A) coefficient 1 and limiting reagent Zn 
B) coefficient 2 and limiting reagent Zn 
C) coefficient 1 and limiting reagent MnO2  
D) coefficient 2 and limiting reagent MnO2  
E) coefficient 2 and limiting reagent NH4Cl

Exam 4: Chemical Reactions

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Na + HCl → NaCl + H₂

What is the concentration (M)of CH₃OH in a solution prepared by dissolving 16.8 g of CH₃OH in sufficient water to give exactly 230 mL of solution?

How many moles of Co²⁺ (aq)are present in 0.150 L of a 0.200 mol L^-1 solution of CoI₂(aq)?

Identify the coefficient of I₂(s) when the following reaction is balanced,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. (unbalanced) Al(s) + I₂(s) → Al₂I₆(s)

What volume of 2.0 M HCl,in mL,is required to dissolve a 10.0 g piece of Zn? Zn(s) + 2 HCl → ZnCl₂ + H₂(g)

A 1.900 g sample of C₆H₁₂ is burned in an excess of oxygen.What mass of CO₂ and H₂O should be obtained?

For the reaction symbolized as HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l) water is both:

If 100.mL of 0.400 mol L^-1 Na₂SO₄(aq) is added to 200 mL of 0.600 mol L^-1 NaCl(aq) ,what is the concentration of Na⁺ ions in the final solution? Assume that the volumes are additive.

What is the molar concentration of sodium ions in a 0.450 mol L^-1 Na₃PO₄(aq) solution?

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s) + O₂(g) → 2 MgO(s) When 4.00 g of magnesium burns,what is the theoretical yield of magnesium oxide?

How many grams of calcium chloride are needed to produce 1.50 g of potassium chloride? CaCl₂(aq) + K₂CO₃(aq) → 2 KCl(aq) + CaCO₃(aq)

A FeCl₃ solution is 0.175 mol L^-1.How many mL of a 0.175 mol L^-1 FeCl₃solution are needed to make 550 mL of a solution that is 0.300 mol L^-1 in Cl^- ion?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? CH₃OH → CO + H₂

How many grams of ZnSO₄ will be made from 41.0 grams each of Zn,K₂Cr₂O₇,and H₂SO₄? 4 Zn + K₂Cr₂O₇ + 7 H₂SO₄ → 4 ZnSO₄ + 2 CrSO₄ + K₂SO₄ + 7 H₂O

Lithium and nitrogen react to produce lithium nitride: 6 Li_(s) + N₂_(g) → 2 Li₃N_(s) How many moles of lithium nitride are produced when 0.450 mol of lithium react in this fashion?

Given the following reaction: Na₂SO₄(s) + 2 C(s) → Na₂S(s) + 2 CO₂(g) How many grams of carbon are required to produce 18.4 g Na₂S(s) ?

What is the concentration of NO₃^- ions in a solution prepared by dissolving 25.0 g of Ca(NO₃) ₂ in enough water to produce 300 mL of solution?

Exam 4: Chemical Reactions

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Na + HCl → NaCl + H2

What is the concentration (M)of CH3OH in a solution prepared by dissolving 16.8 g of CH3OH in sufficient water to give exactly 230 mL of solution?

How many moles of Co2+ (aq)are present in 0.150 L of a 0.200 mol L-1 solution of CoI2(aq)?

Identify the coefficient of I2(s) when the following reaction is balanced,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. (unbalanced) Al(s) + I2(s) → Al2I6(s)

What volume of 2.0 M HCl,in mL,is required to dissolve a 10.0 g piece of Zn? Zn(s) + 2 HCl → ZnCl2 + H2(g)

A 1.900 g sample of C6H12 is burned in an excess of oxygen.What mass of CO2 and H2O should be obtained?

For the reaction symbolized as HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) water is both:

If 100.mL of 0.400 mol L-1 Na2SO4(aq) is added to 200 mL of 0.600 mol L-1 NaCl(aq) ,what is the concentration of Na+ ions in the final solution? Assume that the volumes are additive.

What is the molar concentration of sodium ions in a 0.450 mol L-1 Na3PO4(aq) solution?

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s) + O2(g) → 2 MgO(s) When 4.00 g of magnesium burns,what is the theoretical yield of magnesium oxide?

How many grams of calcium chloride are needed to produce 1.50 g of potassium chloride? CaCl2(aq) + K2CO3(aq) → 2 KCl(aq) + CaCO3(aq)

A FeCl3 solution is 0.175 mol L-1.How many mL of a 0.175 mol L-1 FeCl3 solution are needed to make 550 mL of a solution that is 0.300 mol L-1 in Cl- ion?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? CH3OH → CO + H2

How many grams of ZnSO4 will be made from 41.0 grams each of Zn,K2Cr2O7,and H2SO4? 4 Zn + K2Cr2O7 + 7 H2SO4 → 4 ZnSO4 + 2 CrSO4 + K2SO4 + 7 H2O

Lithium and nitrogen react to produce lithium nitride: 6 Li(s) + N2(g) → 2 Li3N(s) How many moles of lithium nitride are produced when 0.450 mol of lithium react in this fashion?

Given the following reaction: Na2SO4(s) + 2 C(s) → Na2S(s) + 2 CO2(g) How many grams of carbon are required to produce 18.4 g Na2S(s) ?

What is the concentration of NO3- ions in a solution prepared by dissolving 25.0 g of Ca(NO3) 2 in enough water to produce 300 mL of solution?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Na + HCl → NaCl + H₂

What is the concentration (M)of CH₃OH in a solution prepared by dissolving 16.8 g of CH₃OH in sufficient water to give exactly 230 mL of solution?

How many moles of Co²⁺ (aq)are present in 0.150 L of a 0.200 mol L^-1 solution of CoI₂(aq)?

Identify the coefficient of I₂(s) when the following reaction is balanced,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. (unbalanced) Al(s) + I₂(s) → Al₂I₆(s)

What volume of 2.0 M HCl,in mL,is required to dissolve a 10.0 g piece of Zn? Zn(s) + 2 HCl → ZnCl₂ + H₂(g)

A 1.900 g sample of C₆H₁₂ is burned in an excess of oxygen.What mass of CO₂ and H₂O should be obtained?

For the reaction symbolized as HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l) water is both:

If 100.mL of 0.400 mol L^-1 Na₂SO₄(aq) is added to 200 mL of 0.600 mol L^-1 NaCl(aq) ,what is the concentration of Na⁺ ions in the final solution? Assume that the volumes are additive.

What is the molar concentration of sodium ions in a 0.450 mol L^-1 Na₃PO₄(aq) solution?

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s) + O₂(g) → 2 MgO(s) When 4.00 g of magnesium burns,what is the theoretical yield of magnesium oxide?

How many grams of calcium chloride are needed to produce 1.50 g of potassium chloride? CaCl₂(aq) + K₂CO₃(aq) → 2 KCl(aq) + CaCO₃(aq)

A FeCl₃ solution is 0.175 mol L^-1.How many mL of a 0.175 mol L^-1 FeCl₃solution are needed to make 550 mL of a solution that is 0.300 mol L^-1 in Cl^- ion?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? CH₃OH → CO + H₂

How many grams of ZnSO₄ will be made from 41.0 grams each of Zn,K₂Cr₂O₇,and H₂SO₄? 4 Zn + K₂Cr₂O₇ + 7 H₂SO₄ → 4 ZnSO₄ + 2 CrSO₄ + K₂SO₄ + 7 H₂O

Lithium and nitrogen react to produce lithium nitride: 6 Li_(s) + N₂_(g) → 2 Li₃N_(s) How many moles of lithium nitride are produced when 0.450 mol of lithium react in this fashion?

Given the following reaction: Na₂SO₄(s) + 2 C(s) → Na₂S(s) + 2 CO₂(g) How many grams of carbon are required to produce 18.4 g Na₂S(s) ?

What is the concentration of NO₃^- ions in a solution prepared by dissolving 25.0 g of Ca(NO₃) ₂ in enough water to produce 300 mL of solution?