Chemistry 0620 · IGCSE · Diffusion

Diffusion — practice question

(a)[3]

A few drops of liquid bromine were put at the bottom of a beaker containing cyclohexane. After 3 days, a red-brown colour had spread through the entire beaker. Explain these observations using the kinetic particle model.

(b(i))[1]

Deduce the molecular formula of this compound, showing how many carbon, hydrogen, oxygen and bromine atoms it contains.

(b(ii))[1]

State what the functional group $\text{-COOH}$ is called.

(c)[4]

Complete the definition of relative atomic mass by choosing from the list: 6, 12, an atom, an element, a molecule, average, carbon, hydrogen, total. Relative atomic mass is the [BLANK] mass of naturally occurring atoms of [BLANK] on a scale where [BLANK] of the $^{12}\text{C}$ isotope has a mass of exactly [BLANK] units.

(d(i))[3]

Suggest three methods for increasing the rate of this reaction.

(d(ii))[1]

Balance the chemical equation shown for this reaction. $[BLANK]\text{HBr} + \text{O}_2 \rightarrow 2\text{H}_2\text{O} + 2\text{Br}_2$

Worked solution & mark scheme

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