Chemistry 9701 · AS & A Level · States of matter

States of matter — practice question

(a)[2]

Give a balanced equation for how each of these chlorides reacts with water: phosphorus(V) chloride silicon(IV) chloride

(b)[2]

When sulfur is heated under pressure with chlorine, the main product is $\text{SCl}_2$ (Cl-S-Cl). $\text{S}_8(g) + 8\text{Cl}_2(g) \rightarrow 8\text{SCl}_2(g)$ Use data from the Data Booklet to calculate the enthalpy change, $\Delta H$, for this reaction. The eight sulfur atoms in the $\text{S}_8$ molecule are linked together in one ring by single bonds.

(c(i))[1]

What is the oxidation number of sulfur in $\text{SCl}_2$?

(c(ii))[1]

Work out the change in sulfur's oxidation number during the reaction of $\text{SCl}_2$ with water.

(c(iii))[1]

Suggest which substance compound B is.

(c(iv))[2]

Construct an equation for how $\text{SCl}_2$ reacts with water.

(c(v))[2]

What would you observe if each of these reagents were added to separate samples of solution A? $\text{AgNO}_3(aq)$ $\text{K}_2\text{Cr}_2\text{O}_7(aq)$

Worked solution & mark scheme

This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: $\mathrm{PCl_5 + 4H_2O \rightarrow H_3PO_4 + 5HCl}$

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