1. Chemistry and our Earth UNIT 2 Aim A Task 2

2. Learning Aim: Why things don’t fall apart?

3. Scenario On the induction day, a simple experiment will be used as a teamwork and ‘ice-breaking’ exercise. You need to try the experiment first to get a standard set of results to be used when checking the experiments conducted by people on the induction day.

4. a. Practical Carry out the practical experiment ‘Investigating the properties of substances ’. Write up the practical work by recording the results appropriately in the observations table, Table 4, make relevant conclusions and comparisons between the different properties of the substances tested and answer the questions.

5. b. Report In order to prepare the new recruits for their work, you need to produce a written report called ‘Bonding, structure and applications of chemical substances’. Include in your report detailed notes and fully labelled diagrams about the following:

6. Report Content i) The chemical formulae and ‘dot-and-cross’ diagrams of ammonia, carbon dioxide, chlorine, hydrogen, magnesium chloride, magnesium oxide, methane, nitrogen, oxygen, sodium chloride, sodium oxide, water. (ii) An account of how the following chemical substances are formed from their atoms, mentioning the type of chemical bonds formed in each case: sodium chloride, hydrogen, oxygen, nitrogen, magnesium chloride, methane, water. (iii) How the observed properties of the substances investigated in the practical (see part a) can be explained in terms of the type of chemical bonding and the chemical structure present. (iv) The applications and uses of sodium chloride and silicon dioxide, stating how their applications link to their properties and how the type of chemical bonding and their chemical structure are also related to their properties. (v) A data sheet (Table 5) that can be referred to when starting to work with certain chemicals. (vi) A concluding statement about the properties of ionic and covalent substances.

7. Sources of Information Websites Doc Brown’s Chemistry: http://www.docbrown.info/index.htm http://www.docbrown.info/index.htm BBC Bitesize GCSE Science: http://www.bbc.co.uk/schools/gcsebitesize/scienc e/ http://www.bbc.co.uk/schools/gcsebitesize/scienc e/ (Edexcel pre-2011 > Chemistry > Patterns in properties > Groups in the Periodic Table REVISE)

8. Evidence for Task 2  A practical write-up on the properties of substances: observation table filled in; concluding statement; two questions and a data table to complete.  A written report complete with detailed notes and diagrams: dot-and-cross diagrams; detailed notes and diagrams describing how different ionic and covalent bonds are formed; detailed notes and diagrams covering parts b (iii) and b (iv).