Additional Teacher Resource Pack

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1 Additional Teacher Resource Pack Acids and Bases in the Home Copyright Classroom Video Limited This teacher resource pack is copyright of Classroom Video Limited and may not be amended, reproduced or resold in any way without gaining written permission from Classroom Video Limited

2 For Teachers Brief Summary of Programme This programme familiarises students with the features of acids and bases, and discusses their physical and chemical properties. The ph scale is introduced with examples of strong and weak acids and bases and the concept of neutral substances is explored. The use of indicators to test the ph of acids and bases is explained, as well as showing the variety of indicators available and their specific uses. Students are shown how to make their own red cabbage indicator in the kitchen, and examples of acids and bases commonly found in the home are discussed. A description of neutralisation reactions and their products concludes the programme. Curriculum Links The programme directly relates to the content included in Stages 4 and 5 of the syllabus. The aim of the programme is to illustrate the chemical and physical properties of acids and bases. Describing the use of common acids and bases found in the home gives students a contextual framework from which to develop their knowledge and understanding. DVD Timeline 00:00:00 Introduction 00:00:54 what are Acids? 00:02:32 what are Bases? 00:04:22 ph and Indicators 00:08:34 Acids and Bases in the Home 00:12:59 Mixing Acids and Bases 00:16:27 Credits 00:17:55 End Related DVDs available from Classroom Video Ltd. Acids and Bases The Science in Cosmetics The Science in Foods Please contact customer services on Or visit to see our full range of Science titles. 2

3 Other Useful Links Books and Other Print Resources Stannard P and Williamson K (2001) Science World 9, 2 nd Edition. Macmillan. Whalley K, Roberson P, Rickard G and Brown I (2004) Science Focus 3. Pearson Longman. Internet Resources Suggested Activities for before Viewing the Programme 1. Using the internet or library research and complete a short report on acid rain. Find out what it is, how it is formed and the effect it has had on the environment in the Northern hemisphere. 2. Using science textbooks and/or chemical labels, compile a list of the five commonly found acids and their chemical formulae. Compile a similar list for bases. 3. In small groups, discuss and record any prior knowledge or experience with maintaining the ph of a pool or fish tank. Present a short report to the class. 3

4 Student Worksheet While Viewing the Programme 1. What are the names of two common acids? 2. Why are corrosive substances harmful? 3. List two physical properties of bases. 4. Fill in the table below. Acids Bases 5. Draw the ph scale on the line below, showing the regions for acids and bases as well as the neutral position. 6. What is the feature of indicators which makes them useful when testing for acids and bases? 7. Litmus added to base turns Litmus added to acid turns 4

5 8. Why does the cabbage indicator stay the same colour in water? 9. List five acids found in the home. 10. List five bases found in the home. 11. Acid + Base The chemical name for table salt is 13. A neutralisation reaction occurs when: 5

6 Suggested Activities for after Viewing the Programme 1. Make indicators with coloured flower petals and test with acids and bases to assess their suitability as indicators. (Use similar method as illustrated during programme.) 2. Carry out a neutralisation reaction with hydrochloric acid and sodium hydroxide, testing with litmus paper. Evaporate the solution to obtain sodium chloride. 6

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