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?

  • A2NO+HOHNO+HNO2232
  • B3BrFBrF+Br32
  • C2HCOCO+HCO33223
  • D2HO2HO+O2222
  • E4HPO3HPO+PH33343

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?

  • AF+2e2F2
  • BAl+3eAl3+
  • CFeFe+e2+3+
  • DFe+2eFe2+
  • ECl+2e2Cl2

Q9:

Which of the following half-equations describes a reduction?

  • AFeFe+2e2+
  • BZn+2eZn2+
  • C2OO+2e22
  • DFeFe+e2+3+
  • E2BrBr+2e2

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?

  • ACsCl
  • BCaCl2
  • CCa
  • DCs

Which substance is being oxidized?

  • ACa
  • BCsCl
  • CCs
  • DCaCl2

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?

  • ABr+H2HBr22
  • B2Br+2HO4HBr+O222
  • CBr+HO2HBr+O2222
  • DBr+2HCl2HBr+Cl22
  • EBr+SO+2HO2HBr+HSO22224

Q14:

Consider the equation shown.

Which arrow shows reduction?

  • AB
  • BA

Which arrow involves the loss of electrons?

  • AB
  • BA

Which arrow involves the gain of electrons?

  • AA
  • BB

Q15:

Which of the following statements about the following ionic equation is incorrect? Zn()+2Ag()Zn()+2Ag()saqaqs+2+

  • AZinc atoms becoming zinc ions is oxidation.
  • BZinc atoms becoming zinc ions is reduction.
  • CSilver ions becoming silver atoms is reduction.
  • DSilver ions gain electrons.
  • EZinc acts as a reducing agent.

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