Question 1

Which of the following best describes the process of oxidation in terms of electron transfer?

Accepted Answer

The loss of electrons by an atom or ion.

Question 2

In the reaction $$\mathrm{2H_2(g) + O_2$(g) \rightarrow 2H_2O(g)}$$, which substance acts as the reducing agent?

Accepted Answer

Hydrogen, because it loses electrons.

Question 3

Which of the following is the correct oxidation state for oxygen in most of its compounds?

Accepted Answer

$$-2$$

Question 4

A piece of iron rusts when exposed to air and moisture. Which process is occurring to the iron?

Accepted Answer

Oxidation, because iron loses electrons.

Question 5

Which rule should you apply first when assigning oxidation states in a compound?

Accepted Answer

Assign $$0 to $$atoms in their elemental form.

Question 6

In the reaction $$\mathrm{Ca(s) + 2H_2O(l) \rightarrow Ca(OH)_2(aq) + H_2$(g)}$$, which element is reduced?

Accepted Answer

Hydrogen

Question 7

Which of the following statements about oxidizing and reducing agents is correct?

Accepted Answer

The oxidizing agent is reduced during the reaction.

Question 8

A student is balancing the redox reaction $$\mathrm{Al(s) + Ag^+(aq) \rightarrow Al$$^{3+}$$(aq) + Ag(s)}$$ using the half-reaction method. What is the correct number of electrons to add to the oxidation half-reaction?

Accepted Answer

$$3$$ electrons

Question 9

Which of the following is a real-life example of an oxidation-reduction reaction?

Accepted Answer

The bleaching of hair with hydrogen peroxide

Question 10

In the reaction $$\mathrm{Sn(s) + 4HNO_3(aq) \rightarrow $$SnO_2$$(s) + 4NO_2(g) + 2H_2O(l)}$$, which element is oxidized?

Accepted Answer

Tin

Question 11

Which of the following best explains why hydrogen peroxide is effective in bleaching hair?

Accepted Answer

It oxidizes melanin, destroying its color.

Question 12

What is the oxidation state of chlorine in $$\mathrm{$$NaClO_3$$}$$?

Accepted Answer

$$+5$$

Question 13

Which step comes immediately after separating the overall redox reaction into two half-reactions in the half-reaction method?

Accepted Answer

Balance each half-reaction with respect to mass.

Question 14

A solution contains $$\mathrm{Fe$$^{2+}$$}$$ ions. Which of the following could act as an oxidizing agent to convert $$\mathrm{Fe$$^{2+}$$} to$$ $$\mathrm{Fe$$^{3+}$$}$$?

Accepted Answer

$$\mathrm{O_2$}$$

Question 15

Which of the following is the correct sum of oxidation states for all atoms in a neutral molecule?

Accepted Answer

It equals zero.

Question 16

In the context of redox reactions, what does the mnemonic OIL RIG stand for?

Accepted Answer

Oxidation Is Loss (of electrons); Reduction Is Gain (of electrons)

Question 17

Which of the following statements about oxidation states is correct?

Accepted Answer

Oxidation states are assigned based on a set of hierarchical rules.

Question 18

During the oxidation of thiol groups ($$\mathrm{-SH}) in $$hair by hydrogen peroxide, what is the resulting functional group?

Accepted Answer

Sulfonic acid group ($$\mathrm{-SO_3H})$$

Question 19

Which of the following best describes the role of a reducing agent in a chemical reaction?

Accepted Answer

It loses electrons and is oxidized.

Question 20

A redox reaction is balanced with respect to mass but not charge. What should you do next according to the half-reaction method?

Accepted Answer

Add electrons to balance the charge in each half-reaction.

Chapter 16: Oxidation and Reduction – Introductory Chemistry Study Notes

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