Quiz: Oxidation vs. Reduction

Choose the correct terms to complete the sentences.

In the reaction Fe(s) + S(s) → FeS(s), the oxidizing agent is  _________ because it   ____________ electrons.

• Iron … accepts

• Sulfur … accepts

• Iron … give up

• Sulfur … give up

Choose the correct terms to complete the sentences.

In the reaction Fe(s) + S(s) → FeS(s), The reducing agent is  _________ because it   ____________ electrons.

• Iron … accepts

• Sulfur … accepts

• Iron … give up

• Sulfur … give up

Select the option that best describes the following chemical reaction:NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

• It is a non-redox reaction in which the elements retain their oxidation numbers throughout the reaction.

• It is a redox reaction in which the elements retain their oxidation numbers throughout the reaction.

• It is a non-redox reaction in which the oxidation numbers of the elements change.

• It is a redox reaction in which the oxidation numbers of the elements change.

Mark is carrying out an experiment in the lab. He has a beaker of copper sulfate solution, and he places a coil of aluminum in it (Left image).He leaves it for some time. He observes that the solution has turned colorless and there are brown deposits on the aluminum coil (Right image).

Which chemical equation represents the chemical change that has occurred in the experiment?

• 2Al(s) + 3CuSO4(aq) → Al2(SO4)3(aq) + 3Cu(s)

• 2Al(s) + 3CuSO4(aq) → Al2(SO4)3(aq) + 3Cu(aq)

• 2Al(s) + 3CuSO4(aq) → Al2(SO4)3(s) + 3Cu(aq)

• 2Al(s) + 3CuSO4(aq) → Al2(SO4)3(s) + 3Cu(s)

The sum of the oxidation numbers in a neutral compound is always

• a negative number

• a positive number

• zero

• one

Elements in the first column of the periodic table are known as alkali metals. These elements, when ionized, have in common:

• an oxidation number of 1-

• an oxidation number of 1+

• an oxidation number of 2-

• an oxidation number of 2+

In the reaction shown below, which substance is reduced?

3 Na(s) + AlCl3(aq) → 3 NaCl(aq) + Al(s)

• Na(s) → NaCl(aq)

• AlCl3(aq) → Al(s)

• Na(s) → Al(s)

• AlCl3(aq) → NaCl(aq)

Which substance is the reducing agent in the following reaction?

Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g)

• Fe2O3(s)

• CO(g)

• Fe(s)

• CO2(g)

What is the oxidation state of carbon in glucose, C6H12O6?

• 2

• 3

• 4

• 0

Which substance is the reducing agent in the following reaction?

Fe(s) + CuSO4(aq) → Cu(s) + FeSO4(aq)

• Fe(s)

• CuSO4(aq)

• Cu(s)

• FeSO4(aq)