Redox reactions | Combined science | Quizalize & Oak National Academy

Starter quiz

Match the definition with the correct key term.

atom

⇔

is the building block of all matter ✓

ion

⇔

an atom or group of atoms with a positive or negative charge ✓

element

⇔

is made up of only one type of atom ✓

compound

⇔

is made up of 2 or more different elements chemically bonded together ✓
What has been oxidised in this reaction? Zinc oxide + carbon → carbon dioxide + zinc

zinc oxide

carbon ✓

carbon dioxide

zinc
What has been reduced in this reaction? Iron oxide + magnesium → magnesium oxide + iron.

iron oxide ✓

magnesium

magnesium oxide

iron
What key term is used to describe reactions where a more reactive element takes the place of a less reactive element in a compound?

'displacement' ✓
Match the group in the periodic table with the correct charge on their ions.

Group 1

⇔

+1 ✓

Group 2

⇔

+2 ✓

Group 3

⇔

+3 ✓

Group 6

⇔

-2 ✓

Group 7

⇔

-1 ✓
What is the correct formula and charge of a nitrate ion?

N₃ᐨ

N₃ᐨ²

NO₃ᐨ ✓

NO₃ᐨ²

Which of the following statements are true?

oxidation is the loss of oxygen

oxidation is the loss of electrons ✓

reduction is the loss of oxygen ✓

reduction is the loss of electrons

reduction is the gain of electrons ✓
What is the name of a reaction which involves both reduction and oxidation?

'redox' ✓
Which of the following statements are true for this half equation: Ca → Caᐩ² + 2eᐨ?

electrons have been lost ✓

electrons have been gained

the Ca has been oxidised ✓

the Ca has been reduced
Which is the correct half equation for the reduction of Liᐩ?

Li → Liᐩ + eᐨ

Li + eᐨ → Li

Li + eᐨ → Liᐩ

Liᐩ + eᐨ → Li ✓

Liᐩ → Li + eᐨ
What do we not include in ionic equations for reactions?

the species that is oxidised

the species that is reduced

spectator ions ✓
What is the missing product in this overall ionic equation: Cuᐩ² + Al → Alᐩ³ + ___?

Al

Cuᐩ³

Cu ✓

Alᐩ²

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Oxidation is the loss of electrons and reduction is the gain of electrons.
Half equations can be written to show which species are oxidised and which are reduced.
Ionic equations can be written for displacement reactions.

To show the spectator ions in an ionic equation.

Spectator ions are ions that remain the same throughout a reaction. They are not included in the ionic equation.

Oxidation - Oxidation is a type of reaction in which a substance gains oxygen or loses electrons.
Reduction - Reduction is a type of reaction in which a substance loses oxygen or gains electrons.
Half equation - A half equation is a chemical equation used to show the electrons lost in oxidation or the electrons gained in reduction.
Redox reaction - A redox reaction is a reaction where both reduction and oxidation occur.