Redox Reactions Quiz

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Questions and Answers

What occurs during a redox reaction?

The total mass of the reactants is reduced.

Electrons are created and destroyed.

Chemical bonds are broken without any change in charge.

Electrons are transferred between chemical species. (correct)

What does a reduction reaction involve?

Losing electrons.

Combining with oxygen.

Gaining protons.

Gaining electrons. (correct)

In the formation of calcium oxide, which species is oxidized?

Calcium oxide compound.

Electrons.

Oxygen atoms.

Calcium metal. (correct)

Which best describes oxidation in a chemical reaction?

The process of losing electrons. Signup and view all the answers

Why is the term 'oxidation' not limited to reactions involving oxygen?

Because it was expanded to include loss of electrons. Signup and view all the answers

What is the charge of a calcium ion after being oxidized?

2+ Signup and view all the answers

In the reaction of magnesium oxide with hydrogen, which shift indicates reduction?

Oxygen gains electrons. Signup and view all the answers

What was Antoine Lavoisier's contribution to the concept of oxidation?

He identified oxidation as sacrificing oxygen. Signup and view all the answers

What happens to the charge of magnesium when it goes from magnesium oxide to solid magnesium?

It becomes neutral. Signup and view all the answers

Which ion is being reduced in the reaction between zinc chloride and magnesium?

Zinc Signup and view all the answers

What is the main characteristic of spectator ions in a chemical reaction?

They remain unchanged throughout the reaction. Signup and view all the answers

What mnemonic device can help remember the concepts of oxidation and reduction?

OIL RIG Signup and view all the answers

During the reaction of magnesium with zinc chloride, how does magnesium behave?

It is oxidized. Signup and view all the answers

In the reaction between magnesium oxide and hydrogen, which of the following is true regarding magnesium?

It gains two electrons. Signup and view all the answers

What is the final charge of solid zinc after the reaction with magnesium?

0 Signup and view all the answers

In the context of oxidation and reduction, what does the term 'oxidation' specifically refer to?

Loss of electrons. Signup and view all the answers

Study Notes

Redox Reactions

Redox reactions involve electron transfer between species.
Oxidation is the loss of electrons; reduction is the gain of electrons.
"OIL RIG" is a helpful mnemonic: Oxidation Involves Loss, Reduction Involves Gain.
Oxidation doesn't always involve oxygen. The original meaning of oxidation came from reactions involving oxygen.
The transfer of electrons results in a change in charge of the species involved.

Example: Calcium Oxide Formation

2Ca(s) + O₂(g) → 2CaO(s)
Calcium loses electrons, forming Ca²⁺ ions (oxidation).
Oxygen gains electrons, forming O²⁻ ions (reduction).
Oxygen is frequently reduced in redox reactions involving oxygen, but not always.

Example: Determining Oxidation/Reduction

MgO + H₂ → Mg + H₂O
Mg²⁺ in MgO is reduced to Mg⁰ (gaining electrons).
Magnesium oxide is reduced.

Example: Zinc Chloride and Magnesium

ZnCl₂(aq) + Mg(s) → MgCl₂(aq) + Zn(s)
Magnesium is oxidized (loses electrons) to Mg²⁺(aq).
Zinc is reduced (gains electrons) forming Zn⁰(s)
Chloride ions are spectator ions (no charge change).

Net Ionic Equation

The spectator ions are omitted to obtain the net ionic equation
Zn²⁺(aq) + Mg(s) → Mg²⁺(aq) + Zn(s)

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Description

Test your knowledge on redox reactions, including the concepts of oxidation and reduction. This quiz covers electron transfer, mnemonic aids like 'OIL RIG', and practical examples of redox reactions involving calcium, magnesium, and zinc. Get ready to dive into the fascinating world of chemistry!