(a)

(i)

State what determines the maximum oxidation number of the Period 3 elements in their oxides.

[ 1 ]

(b)

Separate samples of aluminium oxide, $\mathrm{Al}_{2} \mathrm{O}_{3}$ , and phosphorus(V) oxide, $\mathrm{P}_{4} \mathrm{O}_{10}$ , react with an excess of NaOH(aq) at room temperature.

[ 3 ]

(i)

Give the state of $\mathrm{Al}_{2} \mathrm{O}_{3}$ and $\mathrm{P}_{4} \mathrm{O}_{10}$ at room temperature.

\begin{aligned} & \mathrm{Al}_{2} \mathrm{O}_{3} \\ & \mathrm{P}_{4} \mathrm{O}_{10} \end{aligned}

[ 1 ]

(ii)

Write an equation for the reaction of each oxide with an excess of NaOH(aq) at room temperature.

\begin{aligned} & \mathrm{Al}_{2} \mathrm{O}_{3}+ \\ & \mathrm{P}_{4} \mathrm{O}_{10}+ \end{aligned}

[ 2 ]

(a)

Two Period 3 elements react with an excess of oxygen at room pressure.

[ 3 ]

(i)

Complete Table 1.2.

Table 1.2

[ 2 ]

(ii)

Write an equation to describe the reaction between $\mathrm{P}_{4} \mathrm{O}_{10}$ and an excess of water.

[ 1 ]

(b)

Aluminium hydroxide is amphoteric.

[ 2 ]

(i)

Explain what is meant by amphoteric.

[ 1 ]

(ii)

Write an equation to describe the reaction that occurs when aluminium hydroxide, $\mathrm{Al}(\mathrm{OH})_{3}$ , reacts with NaOH(aq).

[ 1 ]

[Maximum number: 1]

The elements silicon, phosphorus and sulfur are in Period 3 of the Periodic Table.

(a)

Table 1.1 shows some properties of the elements Si to S .

The first ionisation energy of P is not shown.

Table 1.1

[ 1 ]

(i)

$\quad \mathrm{SiCl}_{4}$ and $\mathrm{PCl}_{5}$ each react with water, forming misty fumes.

Identify the chemical responsible for the misty fumes.

[ 1 ]

[Maximum number: 3]

The Pauling electronegativity values of elements can be used to predict the chemical properties of compounds.

Use the information in Table 1.1 to answer the following questions.

Table 1.1

(a)

$\mathrm{CO}_{2}$ and $\mathrm{SO}_{2}$ are acidic gases.

[ 3 ]

(i)

Write an equation for the reaction of $\mathrm{SO}_{2}$ with $\mathrm{H}_{2} \mathrm{O}$ .

[ 1 ]

(ii)

Write an equation for the reaction of $\mathrm{SO}_{2}$ with NaOH .

[ 1 ]

(iii)

Construct an equation for the reaction of $\mathrm{CO}_{2}$ with $\mathrm{Mg}(\mathrm{OH})_{2}$ .

[ 1 ]

(a)

Gallium is a silver-grey solid. Aluminium and gallium share many similar chemical properties.

[ 2 ]

(i)

Complete the table by predicting the formula of each gallium-containing product formed when gallium oxide reacts separately with hot aqueous hydrochloric acid and with hot concentrated sodium hydroxide.

[Total: 12]

[ 2 ]

[Maximum number: 3]

Gallium is an element in Group 13.
A sample of gallium is analysed using a mass spectrometer. The mass spectrum produced is shown.

(a)

Gallium oxide, $\mathrm{Ga}_{2} \mathrm{O}_{3}$ , and aluminium oxide react in the same way with HCl(aq) and with NaOH(aq).

[ 3 ]

(i)

Suggest the equation for the reaction between $\mathrm{Ga}_{2} \mathrm{O}_{3}$ and HCl(aq).

[ 1 ]

(ii)

Suggest an equation for the reaction between gallium oxide and NaOH(aq).

[ 2 ]

[Maximum number: 3]

Gallium is a metal in Group 13 of the Periodic Table.

(a)

Gallium metal reacts rapidly when exposed to air. A white solid layer is formed on its surface.

[ 3 ]

(i)

Suggest an equation to describe the reaction occurring when gallium metal is exposed to air.

[ 2 ]

(ii)

The table gives the formula of each gallium-containing product formed when gallium oxide reacts separately with hot aqueous hydrochloric acid and hot aqueous sodium hydroxide.

Give the name of the type of behaviour shown by gallium oxide in these reactions.

[ 1 ]

[Maximum number: 2]

Group 2 metals form alkaline solutions in water.

(a)

Unlike the other oxides of Group 2 metals, beryllium oxide is amphoteric.

[ 2 ]

(i)

Give the meaning of the term amphoteric.

[ 1 ]

(ii)

Beryllium oxide and aluminium oxide have similar chemical properties.

The $\mathrm{Be}(\mathrm{OH})_{4}{ }^{2-}$ anion is a product of the reaction between beryllium oxide and excess concentrated $\mathrm{OH}^{-}(\mathrm{aq})$ .

Construct an equation for this reaction.

[ 1 ]

[Maximum number: 2]

Iron pyrite, $\mathrm{FeS}_{2}$ , has a yellow colour that makes it look like gold metal. The compound contains the ions $\mathrm{Fe}^{2+}$ and $\mathrm{S}_{2}{ }^{2-}$ .

(a)

Iron pyrite is often called fool's gold because of its appearance. Impure samples of iron pyrite often contain a small amount of gold.

The gold can be obtained from impure iron pyrite. The impure iron pyrite is roasted in oxygen, to produce iron(III) oxide and sulfur dioxide. Gold does not react with oxygen.

[ 2 ]

(i)

Complete the equation to show the roasting of iron pyrite in oxygen.

4 \mathrm{FeS}_{2}+\ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots . \quad \rightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}+

[ 2 ]

[Maximum number: 4]

Sodium and magnesium are the first two elements in the third period.

(a)

Sodium and magnesium both react with cold water to produce the same type of product in solution. With sodium the solution is clear but with magnesium it appears cloudy.

[ 1 ]

(i)

Write an equation for the reaction of magnesium with cold water.

[ 1 ]

(b)

Group 2 elements, including magnesium, react with oxygen and with dilute acids. There are trends in both the physical and chemical properties of the elements and their compounds down the group. Reactivity generally increases from Mg to Ba .

[ 3 ]

(i)

Give two observations for the reaction of magnesium with oxygen. Write an equation for this reaction. Include state symbols.
equation

[ 3 ]