CAIE IGCSE Chemistry 6.3.1 Some Chemical Reactions Are Reversible Questions

Recognise reversible reactions from the ⇌ symbol and observations such as colour changes when conditions are reversed.

Exam points

state that the ⇌ symbol shows a reversible reaction
identify reversible reactions from colour changes and opposing reaction directions
interpret heating and cooling observations as evidence of reversibility
use the ⇌ notation correctly in unfamiliar chemical equations

[Maximum number: 1]

When the colourless gas $\mathrm{N}_{2} \mathrm{O}_{4}$ is heated, it forms the brown gas $\mathrm{NO}_{2}$ .
When the reaction mixture is cooled, the brown colour fades and turns back to colourless.
Which type of reaction is described by these observations?

decomposition

displacement

reduction

reversible

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CAIE IGCSE Chemistry 6.3.1 Some Chemical Reactions Are Reversible Questions question 1