IB Chemistry HL 2.4 What Drives Chemical Reactions Question Bank

Practise IB Chemistry HL 2.4 with evidence-led questions on energy, spontaneity, entropy, enthalpy and chemical reactions.

Covered syllabus points

2.4.1—Bonding continuum 2.4.2—Bonding triangle 2.4.3—Alloys 2.4.4—Polymers 2.4.5—Addition polymers 2.4.6 (HL)—Condensation polymers

[Maximum number: 3]

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 ]

(b)

Explain why the addition of small amounts of carbon to iron makes the metal harder.

[ 2 ]

[Maximum number: 2]

A sample of bromine has the following composition by mass:

\begin{array}{cc} { }^{79} \mathrm{Br}: & 50.75 \% \\ { }^{81} \mathrm{Br}: & 49.25 \% \end{array}

Deduce, showing your working, the type of bonding and percentage covalent character in calcium bromide, $\mathrm{CaBr}_{2}$ . Use sections 9 and 17 of the data booklet.

[Maximum number: 2]

Titanium and vanadium are consecutive elements in the first transition metal series.

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

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Covered syllabus points

2.4 From models to materials question 1

Question (a)

Question (i)

Question (b)

2.4 From models to materials question 2

2.4 From models to materials question 3