The Group 14 elements show a change from non-metallic to metallic character down the group. Fig. 3.2 shows the boiling points of the simplest hydrides of the Group 14 elements, C to Pb . Fig. 3.2 (i) Explain the trend in the boiling points of the Group 14 hydrides shown in Fig. 3.2. ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ................................................................................................................................. (ii) Deduce the shape of a molecule of $$$\mathrm{SiH}_{4}$$$. .................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_w24_qp_21 Year：2024 Question No：3(d)

Answer:

Knowledge points:

14.1.1.1 addition of hydrogen to an alkene in a hydrogenation reaction, H2(g) and Pt/Ni catalyst and heat

14.1.1.2 cracking of a longer chain alkane, heat with

14.1.2.1 the complete and incomplete combustion of alkanes

14.1.2.2 the free-radical substitution of alkanes by in the presence of ultraviolet light, as exemplified by the reactions of ethane

14.1.3 describe the mechanism of free-radical substitution with reference to the initiation, propagation and termination steps

14.1.4 suggest how cracking can be used to obtain more useful alkanes and alkenes of lower from heavier crude oil fractions

14.1.5 understand the general unreactivity of alkanes, including towards polar reagents in terms of the strength of the C–H bonds and their relative lack of polarity

14.1.6 recognise the environmental consequences of carbon monoxide, oxides of nitrogen and unburnt hydrocarbons arising

3.5.1.1 more contents

3.5.1.2 more contents

3.5.1.3 more contents

3.5.1.4 more contents

3.5.1.5 more contents

3.5.1.6 more contents

3.5.1.7 more contents

3.5.2 predict the shapes of, and bond angles in, molecules and ions analogous to those specified in 3.5.1

Answer:

Knowledge points:

Solution:

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