garrulous definition Oxidation-Reduction Reactions – Chemistry LibreTexts




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Chemistry Chapter 15

by ,
May 2011

Subjects: and oxidation reduction

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37 Cards in this Set

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What is oxidized and what is reduced in the following reaction?

2Al + 3 Br2 → 2 AlBr3

A) Al is oxidized and Br2 is reduced.

Which of the following describes an oxidation?

B) loss of electrons or gain of oxygen

In an oxidation-reduction reaction, the substance oxidized always

shows a loss of electrons

In an oxidation-reduction reaction, the substance reduced always

shows a gain of electrons

In this reaction, what is the substance reduced?

2H2 + O2 → 2H2O

B) oxygen

In this set of chemical reactions, which reaction is an oxidation-reduction reaction?

C) Zn + H2SO4 → ZnSO4 + H2

In the following list, which situation shows reduction?

A) Copper metal precipitates out of a solution of copper sulfate.

In the following reaction, what substance is oxidized?C6H12O6 + 6O2 → 6CO2 + 6H2O

A) carbon in the glucose, C6H12O6

Which of the following situations represents reduction?

C) the formation of O2- from oxygen gas

In the following reaction, what substance is oxidized?

2Mg + O2 → 2MgO

C) magnesium

In the following reaction, what happens to the aluminum metal?

Fe2O3 + 2Al → Al2O3 + 2Fe

A) It is oxidized

What type of reaction is represented by the following half-reaction?

Na+(aq) + e- → Na(s)

A) reduction

In the following half reaction, what class of reaction is shown?

2O2-(aq) → O2 (g) + 4e-

A) oxidation

In the following reaction, which substance gains electrons?

2Li + F2 → 2LiF

D) F2

In the following reaction, what substance loses electrons?

2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) + Sn4+(aq)

Sn2+(aq)

In the following reaction, what substance gains electrons?

2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) + Sn4+(aq)

A) Fe3+(aq)

What is the oxidation state of the atoms in chlorine gas?

E) 0

What is the oxidation state of oxygen in the oxide ion?

C) -2

What is the oxidation number of nitrogen in NCl3?

D) 3+

What is the oxidation number of phosphorus in H3PO4?

E) 5+

What is the oxidation number of chromium in dichromate ion, Cr2O72-?

C) 6+

In the ion MnO4-, the oxidation number of manganese is ________.

B) 7+

In the compound aluminum phosphate, AlPO4, what is the oxidation number of oxygen?

C) 2-

The oxidation number of silicon in silicon dioxide is ________.

B) 4+

In the following reaction, what substance is reduced?

2Na(s) + 2H2O (l) → 2Na+(aq) + 2OH-(aq) + H2(g)

B) H2O (l)

In the reaction below, what substance is oxidized?

2K(s) + 2H2O (l) → 2K+(aq) + 2OH-(aq) + H2(g)

A) K(aq)

Tin reacts with nitric acid according to the following equation. What is the oxidation number of the nitrogen in the product NO2?

Sn(s) + 4HNO3(aq) → SnO2(s) + 4NO2(g) + 2H2O(g)

B) 4+

Tin reacts with nitric acid according to the following equation. What is the oxidation number of the oxygen in the product H2O?

Sn(s) + 4HNO3(aq) → SnO2(s) + 4NO2(g) + 2H2O(g)

A) 2+
B) 2-
C) 6+
D) 6-
E) 8-

When an oxidation-reduction reaction generates electrical energy spontaneously, the cell is called a(n) ________ cell.

D) voltaic

In a voltaic cell, a zinc anode in a zinc sulfate solution is one half-cell, and a copper cathode in a copper sulfate solution is the other half-cell. The two half-cells must be connected by a ________ to complete the circuit.

E) salt bridge

Iron coated with zinc to prevent corrosion is known as ________ iron.

D) galvanized

The green color of copper exposed to air is due to ________ of the surface of the copper.

A) oxidation

The battery used in a car is known as a ________.

D) lead storage

In the activity series, silver is below hydrogen, and magnesium is above hydrogen. This means that ________.

B) magnesium can give electrons to silver

Zinc is above gold in the activity series. This means that ________.

E) zinc will give electrons to gold ions

Silver is below chromium in the activity series. A spontaneous half reaction will take place under what conditions?

A) Chromium metal is placed in a solution of silver nitrate.

Chromium is above iron in the activity series. In order to chrome plate a hubcap, what type of electrolytic cell is needed?

D) an electrolytic cell

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