Lesson 5.4.1.4
5.4.1.4 Oxidation and reduction in terms of electrons (HT only) Quiz: AQA Combined Science, Unit 11
20 questions
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Lesson 5.4.1.4, Oxidation and reduction in terms of electrons (HT only): 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 11: Chemical changes, written with Revision Ninja.
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The 20 questions
-
What is oxidation in terms of electrons?
- Loss of neutrons
- Gain of protons
- Loss of electrons
- Gain of electrons
-
What is reduction in terms of electrons?
- Loss of electrons
- Loss of oxygen
- Gain of charge
- Gain of electrons
-
What is the ionic equation for zinc displacing copper ions?
- Zn + Cu -> Zn2+ + Cu2+
- Zn + Cu2+ -> Zn2+ + Cu
- Zn2+ + Cu -> Zn + Cu2+
- Zn2+ + Cu2+ -> Zn + Cu
-
In the reaction Zn + Cu2+ -> Zn2+ + Cu, which species undergoes oxidation?
- Zinc
- Copper ion
- Zinc ion
- Copper atom
-
In Zn + Cu2+ -> Zn2+ + Cu, which species is reduced?
- Zn2+
- Zn
- Cu
- Cu2+
-
Which half equation represents oxidation?
- Cl2 + 2e- -> 2Cl-
- O2 + 4e- -> 2O2-
- Mg2+ + 2e- -> Mg
- Mg -> Mg2+ + 2e-
-
Which half equation represents reduction?
- 2Cl- -> Cl2 + 2e-
- Na -> Na+ + e-
- Mg -> Mg2+ + 2e-
- Cl2 + 2e- -> 2Cl-
-
In Fe + Cu2+ -> Fe2+ + Cu, which species is reduced?
- Iron atoms
- Copper(II) ions
- Iron(II) ions
- Copper atoms
-
Which ionic equation shows magnesium displacing copper from solution?
- Mg + Cu -> Mg2+ + Cu2+
- Mg2+ + Cu2+ -> Mg + Cu
- Mg2+ + Cu -> Mg + Cu2+
- Mg + Cu2+ -> Mg2+ + Cu
-
How many electrons does a magnesium atom lose when it forms a Mg2+ ion?
- 2
- 4
- 3
- 1
-
In Zn + 2H+ -> Zn2+ + H2, which species is oxidised?
- Zn2+
- H+
- Zn
- H2
-
In Zn + 2H+ -> Zn2+ + H2, which species is reduced?
- Zn
- H2
- Zn2+
- H+
-
In Cl2 + 2Br- -> 2Cl- + Br2, which species is oxidised?
- Br2
- Cl2
- Br-
- Cl-
-
Which equation shows iron displacing silver from silver ions?
- Fe + 2Ag+ -> Fe2+ + 2Ag
- Fe2+ + Ag -> Fe + 2Ag+
- Fe + Ag+ -> Fe2+ + Ag
- Fe2+ + 2Ag+ -> Fe + 2Ag
-
In 2Al + 3Cu2+ -> 2Al3+ + 3Cu, how many electrons does each aluminium atom lose?
- 1
- 6
- 2
- 3
-
Which equation represents a redox reaction in terms of electron transfer?
- NaCl + H2O -> NaCl(aq)
- Mg + 2H+ -> Mg2+ + H2
- CaCO3 -> CaO + CO2
- HCl + NaOH -> NaCl + H2O
-
In the half equation 2H+ + 2e- -> H2, what do the electrons represent?
- Gained electrons
- Transferred protons
- Destroyed neutrons
- Lost electrons
-
Which ionic equation shows copper displacing silver from solution?
- Cu2+ + Ag -> Cu + 2Ag+
- Cu2+ + 2Ag+ -> Cu + 2Ag
- Cu + 2Ag+ -> Cu2+ + 2Ag
- Cu + Ag+ -> Cu2+ + Ag
-
What happens when a chlorine atom becomes a chloride ion?
- Neutralisation
- Oxidation
- Reduction
- Combustion
-
In the half equation 2Br- -> Br2 + 2e-, how many moles of electrons are released when 0.5 mol of Br2 forms?
- 2 mol of electrons
- 0.5 mol of electrons
- 1 mol of electrons
- 4 mol of electrons
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