OCR A Jan 2010 Paper 1 Q3

Answers available below

This question is about different models of bonding and molecular shapes. (a) Magnesium sulfide shows ionic bonding. (i) What is meant by the term ionic bonding?[1] (ii) Draw a dot-and-crossdiagram to show the bonding in magnesium sulfide. Show outer electron shells only. (b) Dot-and-crossdiagrams can be used to predict the shape of covalent molecules. Fluorine has a covalent oxide called difluorine oxide, F2O. The oxygen atom is covalently bonded to each fluorine atom. (i) Draw a dot-and-crossdiagram of a molecule of F2O. Show outer electron shells only. [2] [2]OCR 2010<br />
 (ii) Predict the bond angle in an F2O molecule. Explain your answer.[3] (c) Liquid ammonia, NH3, and water, H2O, both show hydrogen bonding. (i) Draw a labelled diagram to show hydrogen bonding between two molecules of liquid ammonia. [3] (ii) Water has several anomalous properties as a result of its hydrogen bonding. Describe and explain one anomalous property of water which results from hydrogen bonding.[2]OCR 2010 [Total: 13] Turn over<br />

Show answer