Oxidation is a type of reaction in which a substance gains oxygen or loses electrons.

Reduction is a type of reaction in which a substance loses oxygen or gains electrons.

A half equation is a chemical equation used to show the electrons lost in oxidation or the electrons gained in reduction.

A redox reaction is a reaction where both reduction and oxidation occur.

Redox reactions

Chemistry

In the Atmosphere and Changing Climate unit, pupils will build on their understanding of Earth's resources to learn about the evidence for the composition and evolution of the Earth's atmosphere and the impact of human activity on climate change.

In the Earth's Resources unit, pupils learned about the composition and structure of the Earth, and the rock cycle.

Using Earth's resources

Which of the following statements are true?

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

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

Which is the correct half equation for the reduction of Liᐩ?

What do we not include in ionic equations for reactions?

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

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

is made up of 2 or more different elements chemically bonded together

Match the definition with the correct key term.

What has been oxidised in this reaction? Zinc oxide + carbon → carbon dioxide + zinc

What has been reduced in this reaction? 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?

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

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

Starter Quiz