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It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school. All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution. www.pixl.org.ukwww.pixl.org.ukThe PiXL Club Ltd, Company number 07321607 © Copyright The PiXL Club Ltd, 2016 NB: Some of the QWC style questions have more marks than 6 available this is to allow for students to see all of the possible marking points. Commissioned by The PiXL Club Ltd. February 2016 This is a narrated Walking Talking Mark slideshow. It will run automatically when you press start slideshow from the beginning.

3. Question – Ionic and covalent bonding QWC: Describe the differences in properties between ionic and simple covalent substances and explain these properties in terms of the bonding involved. (6 marks)

4. Answer – Ionic and covalent bonding QWC: Describe the differences in properties between ionic and simple covalent substances and explain these properties in terms of the bonding involved. (6 marks) Ionic substances have high melting points, high boiling points and conduct electricity when molten or in solution. This is because strong electrostatic attraction exists between positive and negative ions, as well as strong ionic bonds which require a high amount of energy to be overcome. When ionic substances are in solution, the ions are free to move about. Simple covalent substances have low melting points, low boiling points and do not conduct electricity. This is due to the weak intermolecular forces between molecules, low amount of energy to overcome and no free moving ions or charges.