Worksheet: Redox Reactions

In this worksheet, we will practice identifying redox reactions and writing ionic equations to describe electron transfer between oxidants and reductants.

Q1:

Which of the following is a substrate that is oxidized?

  • AAnionic species
  • BCationic species
  • CReducing agent
  • DNeutral species
  • EOxidizing agent

Q2:

What is the process of losing an electron called?

  • AOxidation
  • BTransference
  • CSublimation
  • DNeutralization
  • EReduction

Q3:

What is the process of gaining an electron called?

  • AOxidation
  • BNeutralization
  • CTransference
  • DReduction
  • ESublimation

Q4:

Which of the following is a substrate that is reduced?

  • AAnionic species
  • BNeutral species
  • COxidizing agent
  • DReducing agent
  • ECationic species

Q5:

Which of the following statements is true?

  • AHydrogen ions can never act as a reducing agent.
  • BAcid–base reactions always involve two different species.
  • CAcid–base reactions always produce water.
  • DMolecular oxygen can never act as a reducing agent.
  • EReduction–oxidation reactions always produce at least two different species.

Q6:

Which of the following is not an oxidation–reduction reaction?

  • A 2 N O + H O H N O + H N O 2 2 3 2
  • B 3 B r F B r F + B r 3 2
  • C 2 H C O C O + H C O 3 3 2 2 3
  • D 2 H O 2 H O + O 2 2 2 2
  • E 4 H P O 3 H P O + P H 3 3 3 4 3

Q7:

A piece of magnesium oxide is heated with hydrogen until the magnesium is recovered. Is the magnesium oxide being oxidized or reduced?

  • AReduced
  • BOxidized

Q8:

Which of the following half-equations describes an oxidation?

  • A F + 2 e 2 F 2
  • B A l + 3 e A l 3 +
  • C F e F e + e 2 + 3 +
  • D F e + 2 e F e 2 +
  • E C l + 2 e 2 C l 2

Q9:

Which of the following half-equations describes a reduction?

  • A F e F e + 2 e 2 +
  • B Z n + 2 e Z n 2 +
  • C 2 O O + 2 e 2 2
  • D F e F e + e 2 + 3 +
  • E 2 B r B r + 2 e 2

Q10:

When a piece of magnesium oxide is heated with hydrogen, magnesium metal is produced. Is the hydrogen oxidized or reduced?

  • AReduced
  • BOxidized

Q11:

Cesium can be produced by reacting calcium with cesium chloride, according to the equation: Ca+2CsClCaCl+2Cs2.

Which substance is being reduced?

  • A C s C l
  • B C a C l 2
  • C C a
  • D C s

Which substance is being oxidized?

  • A C a
  • B C s C l
  • C C s
  • D C a C l 2

Q12:

A piece of magnesium left in air is gradually converted to magnesium oxide. Is this reaction an example of oxidation or reduction?

  • AReduction
  • BOxidation

Q13:

Hydrogen bromide is produced from bromine via a reduction–oxidation reaction. Based on the electrochemical series, which of the following reactions is a valid synthesis of hydrogen bromide from bromine?

  • A B r + H 2 H B r 2 2
  • B 2 B r + 2 H O 4 H B r + O 2 2 2
  • C B r + H O 2 H B r + O 2 2 2 2
  • D B r + 2 H C l 2 H B r + C l 2 2
  • E B r + S O + 2 H O 2 H B r + H S O 2 2 2 2 4

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