The elements sodium to sulfur react with chlorine. The melting points of some of the chlorides formed are shown. chloride NaCl MgCl₂ AlCl₃ SiCl₄ PCl₃ SCl₂ --- --- --- --- --- --- --- melting point/K 1074 987 463 203 161 195 (a) Predict the shapes of AlCl₃ and PCl₃. Draw diagrams to show the shapes, name the shapes and state the bond angles. (i) Explain, in terms of structure and bonding, why the melting point of SiCl₄ is much lower than that of NaCl. (ii) Explain why the…

Chemistry 9701/22 — October/November 2017

Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme

questions

marks

minutes

Topics Chemical Bonding · States of Matter · Chemical Energetics · Reaction Kinetics · Equilibria · Atomic Structure · +5 more

Q1Chemical BondingStates of MatterFree sample

The elements sodium to sulfur react with chlorine. The melting points of some of the chlorides formed are shown.

chloride	NaCl	MgCl₂	AlCl₃	SiCl₄	PCl₃	SCl₂
melting point/K	1074	987	463	203	161	195

(a)

Predict the shapes of AlCl₃ and PCl₃.

Draw diagrams to show the shapes, name the shapes and state the bond angles.

(b)

(i)

Explain, in terms of structure and bonding, why the melting point of SiCl₄ is much lower than that of NaCl.

(ii)

Explain why the melting point of SiCl₄ is higher than that of PCl₃.

(iii)

Draw the 'dot-and-cross' diagram of a molecule of SiCl₄.
Show outer electrons only.

3 more questions

Q2Chemical Energetics · Reaction Kinetics · Equilibria12M
Q3Atomic Structure · Chemical Bonding · Group 215M
Q4Halogen Compounds · Hydroxy Compounds · Introduction to Organic Chemistry · Polymerisation23M

Loading the full paper…