6.) Part A In the following reaction, which element is oxidized? CH3CHO+H2O2?CH3

Question

6.) Part A

In the following reaction, which element is oxidized?

CH3CHO+H2O2?CH3COOH+H2O Express your answer as a chemical symbol.

Part B

In the following reaction, which element is reduced? CH3CHO+H2O2?CH3COOH+H2O Express your answer as a chemical symbol.

Part C

In the following reaction, which element is oxidized? 5C2H6O+4MnO?4+12H+?5C2H4O2+4Mn2++11H2O Express your answer as a chemical symbol.

Part D

In the following reaction, which element is reduced? 5C2H6O+4MnO?4+12H+?5C2H4O2+4Mn2++11H2O Express your answer as a chemical symbol.

8.) To test for iodide ions (for example, in iodized salt), a solution is treated with chlorine to liberate iodine.
2I?+Cl2?I2+2Cl?

Part A

Which substance is oxidized?

Part B

Which is reduced?

9.)

Separate the following redox reactions into half-reactions, and label each half-reaction as oxidation or reduction.

Part A

Oxidation half-reaction for 2Al(s)+6H+(aq)?2Al3+(aq)+3H2(g).

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part B

Reduction half-reaction for 2Al(s)+6H+(aq)?2Al3+(aq)+3H2(g).

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part C

Oxidation half-reaction for 2Ag+(aq)+Be(s)?Be2+(aq)+2Ag(s).

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part D

Reduction half-reaction for 2Ag+(aq)+Be(s)?Be2+(aq)+2Ag(s).

Express your answer as a chemical equation. Identify all of the phases in your answer.

12.)  

Part A

The treatment or storage of a metal object can impact the level of corrosion over time. Classify each metal treatment by its impact on the rate of corrosion.

Drag the appropriate items to their respective bins.

exposing the metal to an electrolyte, electroplating the metal surface, placing the metal object in a moist room, coating the metals with varnish or grease, painting the metal surface,

putting strain on the metal

Increases corrosion rate or Decreases corrosion rate

Part B

Iron corrodes when it is exposed to moist air, forming a coating of a brown, flaky substance known as rust. This brittle rust peels off and exposes the fresh iron underneath to moist air, leading to further rusting.

Identify the processes occurring at the anode and cathode during the rusting of iron.

Drag the appropriate items to their respective bins.

Fe2+ is formed.

Oxygen (O) gains electrons.

OH? is formed.

Iron (Fe) loses electrons.

At anode or At cathode

14.)

Part A

The following half-reactions are of environmental importance. Label each of the reactions as oxidation or reduction.

Drag the appropriate reactions to their respective bins.

Sn2+ ? Sn4++2e?

Bi3++3e? ? Bi

S ? S4++4e?

O+2e? ? O2?

oxidation or reduction

Part B

Combine the following two reactions to obtain a balanced overall redox reaction.

Sn2+ ? Sn4++2e?  and  Bi3++3e? ? Bi

Express your answer as a chemical formula.

Part C

Combine the following two reactions to obtain a balanced overall redox reaction.

S ? S4++4e?  and  O+2e? ? O2?

Express your answer as a chemical formula.

Separate the following redox reactions into half-reactions, and label each half-reaction as oxidation or reduction.

Part A

Oxidation half-reaction for 2Al(s)+6H+(aq)?2Al3+(aq)+3H2(g).

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part B

Reduction half-reaction for 2Al(s)+6H+(aq)?2Al3+(aq)+3H2(g).

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part C

Oxidation half-reaction for 2Ag+(aq)+Be(s)?Be2+(aq)+2Ag(s).

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part D

Reduction half-reaction for 2Ag+(aq)+Be(s)?Be2+(aq)+2Ag(s).

Express your answer as a chemical equation. Identify all of the phases in your answer.

Explanation / Answer

6.) Part A

In the following reaction, which element is oxidized?

CH3CHO+H2O2?CH3COOH+H2O Express your answer as a chemical symbol.

Carbon is oxidized (C)

Part B

In the following reaction, which element is reduced? CH3CHO+H2O2?CH3COOH+H2O Express your answer as a chemical symbol.

Oxygen (O) is reduced

Part C

In the following reaction, which element is oxidized? 5C2H6O+4MnO?4+12H+?5C2H4O2 + 4Mn2++11H2O Express your answer as a chemical symbol.

Carbon is oxidized

Part D

In the following reaction, which element is reduced? 5C2H6O+4MnO?4+12H+?5C2H4O2+4Mn2++11H2O Express your answer as a chemical symbol.

Mn is reduced

8.) To test for iodide ions (for example, in iodized salt), a solution is treated with chlorine to liberate iodine.
2I? + Cl2?I2+2Cl?

Part A

Which substance is oxidized?

Iodine is oxidized (-1 to zero)

Part B

Which is reduced?

Chlorine is reduced (zero to -1)

9)

Oxidation half-reaction for 2Al(s)+6H+(aq)?2Al3+(aq)+3H2(g).

Al(s)   ----> Al+3+ 3e

Reduction half-reaction for 2Al(s)+6H+(aq)?2Al3+(aq)+3H2(g).

2H+ + 2e ---> H2(g)

Part C

Oxidation half-reaction for 2Ag+(aq)+Be(s)?Be2+(aq)+2Ag(s).

Be(s)?Be2+(aq) + 2e

Reduction half reaction of 2Ag+(aq)+Be(s)?Be2+(aq)+2Ag(s).

2Ag+(aq) + 2e---> 2Ag(s).

12)

  

Increases corrosion rate: exposing the metal to an electrolyte,placing the metal object in a moist room, putting strain on the metal

Decreases corrosion rate: electroplating the metal surface,coating the metals with varnish or grease, painting the metal surface,

B)

At anode: Iron (Fe) loses electrons. and Fe2+ is formed.

At cathode: Oxygen (O) gains electrons and OH? is formed.

14)

oxidation: S ? S4++ 4e? and Sn2+ ? Sn4++2e?

reduction: O+2e? ? O2? and Bi3++3e? ? Bi

B)

Combine the following two reactions to obtain a balanced overall redox reaction.

Sn2+ ? Sn4++2e?  and  Bi3++3e? ? Bi

the balanced reaction will be

3Sn2+ + 2Bi3+? 3Sn4++ 2Bi

Part C

S ? S4++4e?  and  O+2e? ? O2?

S + 2O ? S4++ 2 O2?

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