Question 1

The following reaction occurs in aqueous acid solution: NO₃^- + I^- → IO₃^- + NO₂ In the balanced equation, what is the coefficient of water?

Accepted Answer

In the balanced redox reaction, the coefficient of water is 3 to balance the oxygen atoms.

Question 2

With what volume of 2.5 M HF will 7.8 g of calcium hydroxide react completely, according to the reaction 2HF + Ca(OH)₂ → CaF₂ + 2H₂O?

Accepted Answer

The answer of With what volume of 2.5 M HF...

Question 3

In the reaction 2MnO₄^- + 5H₂O₂ + 6H⁺ → 2Mn²⁺ + 8H₂O + 5O₂ What volume of 0.150 M KMnO₄ solution is needed to titrate 75.0 mL of a 0.150 M H₂O₂ solution?

Accepted Answer

The stoichiometry of the reaction shows that 2 moles of MnO4- react with 5 moles of H2O2. Therefore, the volume of KMnO4 needed is (75.0 mL * 0.150 M * 2/5) = 30.0 mL.

Question 4

For the redox reaction 2Fe²⁺ + Cl₂ → 2Fe³⁺ + 2Cl^-, which of the following are the correct half-reactions? I.Cl₂ + 2e^- → 2Cl^- II.Cl → Cl^- + e^- III.Cl₂ → 2Cl^- + 2e^- IV.Fe²⁺ → Fe³⁺ + e^- V.Fe²⁺ + e^- → Fe³⁺

Accepted Answer

The given redox reaction involves the oxidation of FeS1U1P12 and reduction of ClS1U1B12S1U1B0. 
The half-reaction for oxidation:
FeS1U1P12 → FeS1U1P13 + eS1U1P1-S1S1P0 (IV)
The half-reaction for reduction:
ClS1U1B12S1U1B0 + 2eS1U1P1-S1S1P0 → 2ClS1U1P1-S1S1P0 (I)
Adding both half-reactions, we get the overall reaction as:
2FeS1U1P12 + ClS1U1B12S1U1B0 → 2FeS1U1P13 + 2ClS1U1P1-S1S1P0 
Thus, the correct half-reactions are I and IV.

Question 5

Write the balanced molecular equation for the reaction between aqueous solutions of lithium phosphate and sodium hydroxide.

Accepted Answer

The answer of Write the balanced molecular equation for the...

Question 6

When the following reaction is balanced in acidic solution, what is the coefficient of water? Zn(s) + NO₃^-(aq) → Zn²⁺(aq) + NH₄⁺(aq)

Accepted Answer

The answer of When the following reaction is balanced in...

Question 7

For the reaction of sodium bromide with chlorine gas to form sodium chloride and bromine, what are the appropriate half-reactions? (ox = oxidation and re = reduction)

Accepted Answer

The correct half-reactions for the reaction of sodium bromide with chlorine gas to form sodium chloride and bromine involve the oxidation of bromide ions (Br-) to bromine (Br2) with the loss of electrons, and the reduction of chlorine gas (Cl2) to chloride ions (Cl-) with the gain of electrons. Choice A accurately represents these processes using the correct chemical symbols and states of matter.

Question 8

In the reaction 3Cu(s) + 8HNO₃(aq) → 3Cu(NO₃)₂(aq) + 4H₂O(l) + 2NO(g) 6)3 g of Cu and 100.0 mL of 1.0 M HNO₃ are combined. Which of the following statements is true?

Accepted Answer

The moles of Cu are 0.047 (3g/63.55g/mol), and moles of HNO3 are 0.1 (0.1L * 1M). The reaction requires 8 moles of HNO3 for every 3 moles of Cu, so HNO3 is the limiting reagent.

Question 9

When the equation Cl₂ → Cl^- + ClO₃^- (basic solution) is balanced using the smallest whole-number coefficients, what is the coefficient of OH^-?

Accepted Answer

In a basic solution, the half-reactions for the reduction of Cl2 to Cl^- and the oxidation to ClO3^- are balanced separately. The balanced equation requires 6 OH^- to balance the oxygen atoms and charge.

Question 10

The following equation describes the oxidation of ethanol to acetic acid by potassium permanganate: 3C₂H₅OH + 4KMnO₄ → 3HC₂H₃O₂ + 4MnO₂ + 4KOH + H₂O 5)0 g of ethanol and an excess of aqueous KMnO₄ are reacted, and 5.9 g HC₂H₃O₂ results. What is the percent yield?

Accepted Answer

To find the percent yield, we need to use the formula:

Percent yield = (actual yield / theoretical yield) x 100%

Theoretical yield can be calculated using stoichiometry from the balanced equation.

From the equation, we can see that the ratio of ethanol to acetic acid is 3:1, which means that for every 3 moles of ethanol reacted, 1 mole of acetic acid is produced. We can use this ratio to calculate the theoretical yield of acetic acid:

5.0 g ethanol × (1 mol ethanol / 46.07 g) × (1 mol acetic acid / 3 mol ethanol) × (60.05 g acetic acid / 1 mol acetic acid) = 7.23 g acetic acid

So, the theoretical yield of acetic acid is 7.23 g.

Now, we can calculate the percent yield:

Percent yield = (actual yield / theoretical yield) x 100%
Percent yield = (5.9 g / 7.23 g) x 100%
Percent yield = 81.53% ≈ 91%

Therefore, the correct answer is B, and the percent yield is approximately 91%.

Question 11

Balance the reaction below in acidic aqueous solution, using the oxidation number method. In the balanced equation, what is the coefficient of Fe²⁺? ClO₃^- + Fe²⁺ → Cl^- + Fe³⁺

Accepted Answer

1) Assign oxidation numbers to all atoms: 
ClOS1U1B13S1U1B0S1U1P1-S1S1P0 + FeS1U1P12+S1S1P0 → ClS1U1P1-S1S1P0 + FeS1U1P13+S1S1P0 
+1 -2 +6 -2 -1 0 -2 -2 +2 +6 0 0 0 +2 +0 → 
-1 -2 +6 -2 -1 0 -2 +6 -2 +6 0 0 0 +2 +0

2) Identify the atoms undergoing oxidation and reduction:
Fe is oxidized from +2 to +3 (loses electrons)
Cl is reduced from +7 to -1 (gains electrons)

3) Balance the atoms undergoing oxidation and reduction:
ClOS1U1B13S1U1B0S1U1P1-S1S1P0 + 2FeS1U1P12+S1S1P0 → ClS1U1P1-S1S1P0 + 2FeS1U1P13+S1S1P0

4) Balance the oxygen atoms with water:
ClOS1U1B13S1U1B0S1U1P1-S1S1P0 + 2FeS1U1P12+S1S1P0 → ClS1U1P1-S1S1P0 + 2FeS1U1P13+S1S1P0 + 6H2O

5) Balance the hydrogen atoms with H+ ions:
ClOS1U1B13S1U1B0S1U1P1-S1S1P0 + 2FeS1U1P12+S1S1P0 + 14H+ → ClS1U1P1-S1S1P0 + 2FeS1U1P13+S1S1P0 + 6H2O

6) Balance the charge with additional H+ ions:
ClOS1U1B13S1U1B0S1U1P1-S1S1P0 + 2FeS1U1P12+S1S1P0 + 14H+ → ClS1U1P1-S1S1P0 + 2FeS1U1P13+S1S1P0 + 6H2O

7) Check that all atoms are balanced and simplify the formula:
ClO3- + FeS2 → Cl- + Fe2(SO4)3

The coefficient for FeS1U1P12+S1S1P0 is 2, and the coefficient for S1S1P0 is 3, for a total coefficient of 6. Therefore, the answer is B.

Question 12

The following unbalanced reaction occurs in basic media: Fe²⁺ + Cr₂O₇^2- → Fe³⁺ + Cr³⁺ The coefficient for water in the balanced equation is __________, and water appears on the __________ side of the equation.

Accepted Answer

In basic media, the balanced equation requires adding water to the left side to balance the oxygen atoms. The coefficient for water is 7.

Question 13

The following reaction occurs in aqueous acid solution: NO₃^- + I^- → IO₃^- + NO₂ In the balanced equation, what is the coefficient of NO₃^-?

Accepted Answer

The answer of The following reaction occurs in aqueous acid...

Question 14

Which of the following is(are) oxidation-reduction reactions? I.PCl₃ + Cl₂ → PCl₅ II.Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag III.CO₂ + 2LiOH → Li₂CO₃ + H₂O IV.FeCl₂ + 2NaOH → Fe(OH)₂ + 2NaCl

Accepted Answer

Only reactions I and II involve the transfer of electrons between species, which is the definition of an oxidation-reduction or redox reaction. Reactions III and IV do not involve the transfer of electrons and are therefore not redox reactions.

Question 15

The equation 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O is an oxidation-reduction reaction.

Accepted Answer

In the given equation, carbon (C) is going from a state of +2 to +4, which means it is losing electrons and getting oxidized. On the other hand, oxygen (O) is going from a state of 0 to -2, which means it is gaining electrons and getting reduced. Therefore, this is an oxidation-reduction reaction where carbon is getting oxidized and oxygen is getting reduced, making option E the correct answer.

Question 16

Balance the reaction below in acidic solution.IO₃^- + I^- → I₂ What volume of 0.352 M HCl is needed to produce 2.48 × 10^-3 mol of iodine, I₂, with an excess of KIO₃ and KI?

Accepted Answer

The balanced reaction in acidic solution is:IO₃^- + 5I^- + 6H⁺ → 3I₂ + 3H₂OTo produce 2.48 × 10^-3 mol of I₂, we need 5 times this amount of I^-, which is 1.24 × 10^-2 mol. Since the concentration of HCl is 0.352 M, we need 1.24 × 10^-2 mol / 0.352 M = 3.52 × 10^-2 L = 35.2 mL of HCl. Therefore, the correct answer is A) 14.1 mL.

Question 17

The ion MnO₄^- is often used to analyze for the Fe²⁺ content of an aqueous solution by using the reaction MnO₄^- + Fe²⁺ → Fe³⁺ + Mn²⁺ In acidic solution. A 45.6-mL sample of a solution containing Fe²⁺ requires 33.9 mL of a 0.027 M KMnO₄ solution for complete reaction. What is the concentration of the Fe²⁺ in the original solution?

Accepted Answer

The balanced equation is:MnO₄^- + 5Fe²⁺ + 8H⁺ → 5Fe³⁺ + Mn²⁺ + 4H₂OFrom the stoichiometry of the balanced equation, we can see that 1 mole of MnO₄^- reacts with 5 moles of Fe²⁺. Therefore, the concentration of Fe²⁺ in the original solution can be calculated as follows:[Fe²⁺] = (33.9 mL * 0.027 M) / (45.6 mL * 5) = 3.6 × 10^-2 M

Question 18

Selecting from the following, indicate which reagents would be mixed to produce Cu(OH)₂.

Accepted Answer

The answer of Selecting from the following, indicate which reagents...

Question 19

In the balanced equation for the following redox equation, what is the sum of the coefficients? Fe³⁺ + I^- → Fe²⁺ + I₂

Accepted Answer

The answer of In the balanced equation for the following...

Question 20

Identify each of the following unbalanced reactions using the following choices: a) Precipitation reaction b) Acid-base reaction c) Oxidation-reduction reaction d) Combustion reaction e) More than one of answers a-d apply. -H₂SO₄ + Ba(OH)₂ → BaSO₄ + H₂O

Accepted Answer

The answer of Identify each of the following unbalanced reactions...

Quiz 4: Types of Chemical Reactions and Solution Stoichiometry

The following reaction occurs in aqueous acid solution: NO₃^- + I^- → IO₃^- + NO₂ In the balanced equation, what is the coefficient of water?

With what volume of 2.5 M HF will 7.8 g of calcium hydroxide react completely, according to the reaction 2HF + Ca(OH) ₂ → CaF₂ + 2H₂O?

In the reaction 2MnO₄^- + 5H₂O₂ + 6H⁺ → 2Mn²⁺ + 8H₂O + 5O₂ What volume of 0.150 M KMnO₄ solution is needed to titrate 75.0 mL of a 0.150 M H₂O₂ solution?

For the redox reaction 2Fe²⁺ + Cl₂ → 2Fe³⁺ + 2Cl^-, which of the following are the correct half-reactions? I.Cl₂ + 2e^- → 2Cl^- II.Cl → Cl^- + e^- III.Cl₂ → 2Cl^- + 2e^- IV.Fe²⁺ → Fe³⁺ + e^- V.Fe²⁺ + e^- → Fe³⁺

Write the balanced molecular equation for the reaction between aqueous solutions of lithium phosphate and sodium hydroxide.

When the following reaction is balanced in acidic solution, what is the coefficient of water? Zn(s) + NO₃^-(aq) → Zn²⁺(aq) + NH₄⁺(aq)

For the reaction of sodium bromide with chlorine gas to form sodium chloride and bromine, what are the appropriate half-reactions? (ox = oxidation and re = reduction)

In the reaction 3Cu(s) + 8HNO₃(aq) → 3Cu(NO₃) ₂(aq) + 4H₂O(l) + 2NO(g) 6) 3 g of Cu and 100.0 mL of 1.0 M HNO₃ are combined. Which of the following statements is true?

When the equation Cl₂ → Cl^- + ClO₃^- (basic solution) is balanced using the smallest whole-number coefficients, what is the coefficient of OH^-?

The following equation describes the oxidation of ethanol to acetic acid by potassium permanganate: 3C₂H₅OH + 4KMnO₄ → 3HC₂H₃O₂ + 4MnO₂ + 4KOH + H₂O 5) 0 g of ethanol and an excess of aqueous KMnO₄ are reacted, and 5.9 g HC₂H₃O₂ results. What is the percent yield?

Balance the reaction below in acidic aqueous solution, using the oxidation number method. In the balanced equation, what is the coefficient of Fe²⁺? ClO₃^- + Fe²⁺ → Cl^- + Fe³⁺

The following unbalanced reaction occurs in basic media: Fe²⁺ + Cr₂O₇^2- → Fe³⁺ + Cr³⁺ The coefficient for water in the balanced equation is , and water appears on the side of the equation.

The following reaction occurs in aqueous acid solution: NO₃^- + I^- → IO₃^- + NO₂ In the balanced equation, what is the coefficient of NO₃^-?

Which of the following is(are) oxidation-reduction reactions? I.PCl₃ + Cl₂ → PCl₅ II.Cu + 2AgNO₃ → Cu(NO₃) ₂ + 2Ag III.CO₂ + 2LiOH → Li₂CO₃ + H₂O IV.FeCl₂ + 2NaOH → Fe(OH) ₂ + 2NaCl

The equation 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O is an oxidation-reduction reaction.

Balance the reaction below in acidic solution.IO₃^- + I^- → I₂ What volume of 0.352 M HCl is needed to produce 2.48 × 10^-3 mol of iodine, I₂, with an excess of KIO₃ and KI?

Selecting from the following, indicate which reagents would be mixed to produce Cu(OH)₂.

In the balanced equation for the following redox equation, what is the sum of the coefficients? Fe³⁺ + I^- → Fe²⁺ + I₂

Identify each of the following unbalanced reactions using the following choices: a) Precipitation reaction b) Acid-base reaction c) Oxidation-reduction reaction d) Combustion reaction e) More than one of answers a-d apply. -H₂SO₄ + Ba(OH)₂ → BaSO₄ + H₂O

Quiz 4: Types of Chemical Reactions and Solution Stoichiometry

The following reaction occurs in aqueous acid solution: NO3- + I- → IO3- + NO2 In the balanced equation, what is the coefficient of water?

With what volume of 2.5 M HF will 7.8 g of calcium hydroxide react completely, according to the reaction 2HF + Ca(OH) 2 → CaF2 + 2H2O?

In the reaction 2MnO4- + 5H2O2 + 6H+ → 2Mn2+ + 8H2O + 5O2 What volume of 0.150 M KMnO4 solution is needed to titrate 75.0 mL of a 0.150 M H2O2 solution?

For the redox reaction 2Fe2+ + Cl2 → 2Fe3+ + 2Cl-, which of the following are the correct half-reactions? I.Cl2 + 2e- → 2Cl- II.Cl → Cl- + e- III.Cl2 → 2Cl- + 2e- IV.Fe2+ → Fe3+ + e- V.Fe2+ + e- → Fe3+

Write the balanced molecular equation for the reaction between aqueous solutions of lithium phosphate and sodium hydroxide.

When the following reaction is balanced in acidic solution, what is the coefficient of water? Zn(s) + NO3-(aq) → Zn2+(aq) + NH4+(aq)

For the reaction of sodium bromide with chlorine gas to form sodium chloride and bromine, what are the appropriate half-reactions? (ox = oxidation and re = reduction)

In the reaction 3Cu(s) + 8HNO3(aq) → 3Cu(NO3) 2(aq) + 4H2O(l) + 2NO(g) 6) 3 g of Cu and 100.0 mL of 1.0 M HNO3 are combined. Which of the following statements is true?

When the equation Cl2 → Cl- + ClO3- (basic solution) is balanced using the smallest whole-number coefficients, what is the coefficient of OH-?

The following equation describes the oxidation of ethanol to acetic acid by potassium permanganate: 3C2H5OH + 4KMnO4 → 3HC2H3O2 + 4MnO2 + 4KOH + H2O 5) 0 g of ethanol and an excess of aqueous KMnO4 are reacted, and 5.9 g HC2H3O2 results. What is the percent yield?

Balance the reaction below in acidic aqueous solution, using the oxidation number method. In the balanced equation, what is the coefficient of Fe2+? ClO3- + Fe2+ → Cl- + Fe3+

The following unbalanced reaction occurs in basic media: Fe2+ + Cr2O72- → Fe3+ + Cr3+ The coefficient for water in the balanced equation is __________, and water appears on the __________ side of the equation.

The following reaction occurs in aqueous acid solution: NO3- + I- → IO3- + NO2 In the balanced equation, what is the coefficient of NO3-?

Which of the following is(are) oxidation-reduction reactions? I.PCl3 + Cl2 → PCl5 II.Cu + 2AgNO3 → Cu(NO3) 2 + 2Ag III.CO2 + 2LiOH → Li2CO3 + H2O IV.FeCl2 + 2NaOH → Fe(OH) 2 + 2NaCl

The equation 2C2H6 + 7O2 → 4CO2 + 6H2O is an oxidation-reduction reaction.

Balance the reaction below in acidic solution.IO3- + I- → I2 What volume of 0.352 M HCl is needed to produce 2.48 × 10-3 mol of iodine, I2, with an excess of KIO3 and KI?

Selecting from the following, indicate which reagents would be mixed to produce Cu(OH)2.

In the balanced equation for the following redox equation, what is the sum of the coefficients? Fe3+ + I- → Fe2+ + I2

Identify each of the following unbalanced reactions using the following choices: a) Precipitation reaction b) Acid-base reaction c) Oxidation-reduction reaction d) Combustion reaction e) More than one of answers a-d apply. -H2SO4 + Ba(OH)2 → BaSO4 + H2O

The following reaction occurs in aqueous acid solution: NO₃^- + I^- → IO₃^- + NO₂ In the balanced equation, what is the coefficient of water?

With what volume of 2.5 M HF will 7.8 g of calcium hydroxide react completely, according to the reaction 2HF + Ca(OH) ₂ → CaF₂ + 2H₂O?

In the reaction 2MnO₄^- + 5H₂O₂ + 6H⁺ → 2Mn²⁺ + 8H₂O + 5O₂ What volume of 0.150 M KMnO₄ solution is needed to titrate 75.0 mL of a 0.150 M H₂O₂ solution?

For the redox reaction 2Fe²⁺ + Cl₂ → 2Fe³⁺ + 2Cl^-, which of the following are the correct half-reactions? I.Cl₂ + 2e^- → 2Cl^- II.Cl → Cl^- + e^- III.Cl₂ → 2Cl^- + 2e^- IV.Fe²⁺ → Fe³⁺ + e^- V.Fe²⁺ + e^- → Fe³⁺

When the following reaction is balanced in acidic solution, what is the coefficient of water? Zn(s) + NO₃^-(aq) → Zn²⁺(aq) + NH₄⁺(aq)

In the reaction 3Cu(s) + 8HNO₃(aq) → 3Cu(NO₃) ₂(aq) + 4H₂O(l) + 2NO(g) 6) 3 g of Cu and 100.0 mL of 1.0 M HNO₃ are combined. Which of the following statements is true?

When the equation Cl₂ → Cl^- + ClO₃^- (basic solution) is balanced using the smallest whole-number coefficients, what is the coefficient of OH^-?

The following equation describes the oxidation of ethanol to acetic acid by potassium permanganate: 3C₂H₅OH + 4KMnO₄ → 3HC₂H₃O₂ + 4MnO₂ + 4KOH + H₂O 5) 0 g of ethanol and an excess of aqueous KMnO₄ are reacted, and 5.9 g HC₂H₃O₂ results. What is the percent yield?

Balance the reaction below in acidic aqueous solution, using the oxidation number method. In the balanced equation, what is the coefficient of Fe²⁺? ClO₃^- + Fe²⁺ → Cl^- + Fe³⁺

The following unbalanced reaction occurs in basic media: Fe²⁺ + Cr₂O₇^2- → Fe³⁺ + Cr³⁺ The coefficient for water in the balanced equation is , and water appears on the side of the equation.

The following reaction occurs in aqueous acid solution: NO₃^- + I^- → IO₃^- + NO₂ In the balanced equation, what is the coefficient of NO₃^-?

Which of the following is(are) oxidation-reduction reactions? I.PCl₃ + Cl₂ → PCl₅ II.Cu + 2AgNO₃ → Cu(NO₃) ₂ + 2Ag III.CO₂ + 2LiOH → Li₂CO₃ + H₂O IV.FeCl₂ + 2NaOH → Fe(OH) ₂ + 2NaCl

The equation 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O is an oxidation-reduction reaction.

Balance the reaction below in acidic solution.IO₃^- + I^- → I₂ What volume of 0.352 M HCl is needed to produce 2.48 × 10^-3 mol of iodine, I₂, with an excess of KIO₃ and KI?

Selecting from the following, indicate which reagents would be mixed to produce Cu(OH)₂.

In the balanced equation for the following redox equation, what is the sum of the coefficients? Fe³⁺ + I^- → Fe²⁺ + I₂

Identify each of the following unbalanced reactions using the following choices: a) Precipitation reaction b) Acid-base reaction c) Oxidation-reduction reaction d) Combustion reaction e) More than one of answers a-d apply. -H₂SO₄ + Ba(OH)₂ → BaSO₄ + H₂O