Structure 1. Models of the particulate nature of matter

1.1 Introduction to the particulate nature of matter

1.2 The nuclear atom

1.3 Electron configurations

1.4 The mole

1.5 Ideal gases

Structure 2. Models of bonding and structure

2.1 The ionic model

2.2 The covalent model

2.3 The metallic model

2.4 From models to materials

Structure 3. Classification of matter

3.1 The periodic table

3.2 Functional groups: Organic compounds

Reactivity 1. What drives chemical reactions?

1.1 Measuring enthalpy changes

1.2 Energy cycles

1.3 Energy from fuels

Reactivity 2. How much, how fast and how far?

2.1 Amount of chemical change

2.2 Rate of chemical change

2.3 Extent of chemical change

Reactivity 3. What are the mechanisms of chemical change?

3.1 Proton transfer reactions

3.2 Electron transfer reactions

3.3 Electron sharing reactions (Radicals)

3.4 Electron-pair sharing reactions

IB Chemistry SL 2.1 The ionic model Question Bank

[Maximum number: 2]

There are many oxides of silver with the formula $\mathrm{Ag}_{\mathrm{x}} \mathrm{O}_{\mathrm{y}}$ . All of them decompose into their elements when heated strongly.

(a)

(i)

Explain the electrical conductivity of molten $\mathrm{Na}_{2} \mathrm{O}$ and $\mathrm{P}_{4} \mathrm{O}_{10}$ .

[ 2 ]

[Maximum number: 4]

When heated in air, magnesium ribbon reacts with oxygen to form magnesium oxide.

(a)

State the types of bonding in magnesium, oxygen and magnesium oxide, and how the valence electrons produce these types of bonding.

[ 4 ]

[Maximum number: 2]

Iron may be extracted from iron (II) sulfide, FeS.

(a)

Iron (II) sulfide, FeS , is ionically bonded.

[ 2 ]

(i)

Describe the bonding in this type of solid.

[ 2 ]

[Maximum number: 1]

Iron tablets are often prescribed to patients. The iron in the tablets is commonly present as iron(II) sulfate, $\mathrm{FeSO}_{4}$ .
Two students carried out an experiment to determine the percentage by mass of iron in a brand of tablets marketed in Cyprus.
Experimental Procedure:
- The students took five iron tablets and found that the total mass was 1.65 g .
- The five tablets were ground and dissolved in $100 \mathrm{~cm}^{3}$ dilute sulfuric acid, $\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq})$ . The solution and washings were transferred to a $250 \mathrm{~cm}^{3}$ volumetric flask and made up to the mark with deionized (distilled) water.
- $25.0 \mathrm{~cm}^{3}$ of this $\mathrm{Fe}^{2+}(\mathrm{aq})$ solution was transferred using a pipette into a conical flask. Some dilute sulfuric acid was added.
- A titration was then carried out using a $5.00 \times 10^{-3} \mathrm{moldm}^{-3}$ standard solution of potassium permanganate, $\mathrm{KMnO}_{4}(\mathrm{aq})$ . The end-point of the titration was indicated by a slight pink colour.
The following results were recorded.

(a)

(i)

One titration was abandoned because a brown precipitate, manganese(IV) oxide, formed. State the chemical formula of this compound.

[ 1 ]

[Maximum number: 1]

Iron(II) sulfide can be produced by heating powdered iron and sulfur together.

(a)

A student hypothesised that iron(II) sulfide is ionic and therefore can be converted back to iron and sulfur by electrolysis of the molten salt, using inert electrodes.

[ 1 ]

(i)

Contrast one physical property of iron and iron(II) sulfide.

[ 1 ]

[Maximum number: 1]

Nitric acid, $\mathrm{HNO}_{3}$ , is a strong acid.

(a)

(i)

Write the formula of nickel(II) nitrate.

[ 1 ]

[Maximum number: 1]

Titanium is a transition metal.

(a)

(i)

State the type of bonding in potassium chloride which melts at 1043 K .

[ 1 ]

[Maximum number: 1]

An expanded view of the NaCl lattice is given in the figure.

Which statement is correct for the lattice structure of NaCl ?

The ions are held together in the lattice by covalent bonds.

The forces of attraction in the lattice are very weak.

Each sodium ion is surrounded by four chloride ions.

The structure breaks apart when dissolved in water.

[Maximum number: 1]

What is the formula of the compound formed by aluminium ions and sulfate(VI) ions?

$\mathrm{AlSO}_{3}$

$\mathrm{Al}_{2}\left(\mathrm{SO}_{3}\right)_{3}$

$\mathrm{AlSO}_{4}$

$\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$

[Maximum number: 1]

A substance has the following properties:

What is the most probable structure of this substance?

Simple molecular

Ionic lattice

Covalent network

Metallic lattice

0 selected

Question 1

Question 1(c)

Question 1(c)(ii)

Question 1

Question 1(g)

Question 1

Question 1(c)

Question 1(c)(i)

Question 1

Question 1(f)

Question 1(f)(i)

Question 1

Question 1(c)

Question 1(c)(iii)

Question 2

Question 2(b)

Question 2(b)(ii)

Question 2

Question 2(e)

Question 2(e)(i)

Question 6

Question 6

Question 7