CIE Jun 2015 v2 Paper 4 Q1

Answers available below

Section A Answer all the questions in the spaces provided. (a) Complete the electronic con gurations of the following atoms.uorine: 1s2 sulfur: 1s2 [1] (b) (i) Write an equation to show the thermal decomposition of HCl.[1] (ii) Using all relevant bond energy values from the Data Booklet, explain why the thermal stability of HF is much more than that of HCl.[1] (c) Explain what is meant by the term electronegativity, and how it relates to the concept of bond polarity.[2]UCLES 2015 9701/42/M/J/15<br /> (d) Sulfur anduorine react together to give the covalent compound SF4. (i) Draw a dot-and-cross diagram to show the bonding in SF4. Include all outer shell electrons in your diagram. (ii) State whether a molecule of SF4 has a dipole moment. Explain your answer.[1] [2] (e) Suggest a reason why sulfur can form both SF4 and SF6 whereas oxygen can only form OF2.[1] (f) (i) State a major source of atmospheric sulfur dioxide.[1] (ii) State one environmental consequence of atmospheric sulfur dioxide.[1] [Total: 11]UCLES 2015 9701/42/M/J/15 [Turn over<br />

Show answer