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 2.4 From models to materials Question Bank

[Maximum number: 1]

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

(a)

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

[ 1 ]

(i)

Suggest why chemists find it convenient to classify bonding into ionic, covalent and metallic.

[ 1 ]

[Maximum number: 2]

Alloys containing at least 60 % copper reduce the presence of bacteria on their surface. The percentage of copper in brass, an alloy of copper and zinc, can be determined by UV-vis spectrometry.

A sample of brass is dissolved in concentrated nitric acid and then made up to $250.0 \mathrm{~cm}^{3}$ with water before analysis.

\begin{aligned} & \mathrm{Cu}(\mathrm{~s})+4 \mathrm{HNO}_{3}(\mathrm{aq}) \rightarrow \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+2 \mathrm{NO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \\ & 3 \mathrm{Zn}(\mathrm{~s})+8 \mathrm{HNO}_{3}(\mathrm{aq}) \rightarrow 3 \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+2 \mathrm{NO}(\mathrm{~g})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \end{aligned}

The concentration of copper(II) ions in the resulting solution is then determined from a calibration curve, which is plotted by measuring the light absorbance of standard solutions.

Calibration curve

(a)

(i)

Comment on the suitability of using brass of this composition for door handles in hospitals.

If you did not obtain an answer to (d)(i), use 70 % but this is not the correct answer.

[ 1 ]

(ii)

Suggest another property of brass that makes it suitable for door handles.

[ 1 ]

[Maximum number: 1]

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

(a)

Outline why solid iron(II) sulfide is a polar covalent compound. Use sections 9 and 17 of the data booklet.

[ 1 ]

[Maximum number: 2]

Titanium is a transition metal.

(a)

(i)

Explain why an aluminium-titanium alloy is harder than pure aluminium.

[ 2 ]

[Maximum number: 1]

The electronegativities of four elements are given in the table.

Which statement is correct?

W and X form an ionic compound.

W and X form a covalent compound.

Y and Z form an ionic compound.

Y and Z form a covalent compound.

[Maximum number: 1]

Which monomer could produce this polymer?

$\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{CH}_{2} \mathrm{CH}_{2}$

$\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{CHCH}_{2}$

$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHCH}_{2}$

$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2} \mathrm{CH}_{2}$

[Maximum number: 1]

Which monomer produces this addition polymer?

[Maximum number: 1]

A section of a polymer containing three repeating units is shown.

Which monomer was used to make this polymer?

But-1-ene

But-2-ene

Methylpropene

Propene

[Maximum number: 1]

Alloying a metal with a metal of smaller atomic radius can disrupt the lattice and make it more difficult for atoms to slide over each other. Which property will increase as a result?

Electrical conductivity

Ductility

Malleability

Strength

[Maximum number: 3]

Phenylethene (styrene) is produced from ethylbenzene in a gas-phase equilibrium.

(a)

(i)

Complete the diagram to show the repeating unit of polystyrene.

[ 2 ]

(ii)

State the type of polymerization that occurs.

[ 1 ]

0 selected

Question 1

Question 1(c)

Question 1(c)(iv)

Question 1

Question 1(e)

Question 1(e)(i)

Question 1(e)(ii)

Question 1

Question 1(b)

Question 2

Question 2(d)

Question 2(d)(ii)

Question 9

Question 10

Question 10

Question 11

Question 12

Question 3

Question 3(d)

Question 3(d)(i)

Question 3(d)(ii)