1113_y05_sw_2

1113_y05_sw_2 - Checkpoint Science Scheme of Work Chemistry...

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Checkpoint Science Scheme of Work Chemistry – Year 1 Topic: Acids and bases Aims That pupils should be able to: use indicators to distinguish acid and alkaline solutions use a pH scale understand neutralisation and some of its applications Links Checkpoint curriculum – Cc 5, Cc 6 IGCSE Syllabus – Section 8.1, IGCSE Co-ordinated Science C 9, IGCSE Combined Sciences Chemistry Topic Four Words acid and acidic, alkali and alkaline, neutral, indicator, pH scale. Activities Objectives Students should be able to: Possible Activities Health and safety/notes c ompare between weak and strong acids Provide a display of acids (vinegar, lemon juice, canned drink, laboratory acids) with hazard labels where appropriate. Discuss the meaning of the hazard labels. Students can discuss and draw a hazard label seen on a sack of chemicals or on a chemical transporter. Teacher and students to wear safety glasses whenever using acids. Link wash of spillage with dilution of acid. p repare indicators using crushing and filtering techniques. Students can prepare dyes from colourful vegetables, fruits, flowers; good examples are turmeric, red cabbage, beetroot. If stored until another lesson these should be kept out of the light. u se their prepared indicator on some acids and alkalis as the chemical opposite of an acid. Students test their dye on two named acids and two named alkalis. They can then test three colourless liquids and decide whether they are acid, alkali or neutral. Teacher and students to wear safety glasses whenever using acids. Practice drawing up a table for observations. d istinguish strong and weak acids and alkalis Students should see the scale of colours (pH) Teacher and students to wear safety glasses www.xtremepapers.net
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using Universal Indicator. shown by Universal Indicator (mixture of plant dyes) and then test some different substances such as toothpaste, fruit drinks, indigestion tablets, soil shaken in water, to put in position on the scale. whenever using acids. Coloured pencils are more realistic than pens for charts. recognise some problems with acidic properties Students can investigate one or more of these. Acid rain on buildings (HC l and crushed limestone) pH of soil (test soils to find out which would support which range of plants) Sour milk (test milk of different ages left in warm conditions) Teacher and students to wear safety glasses whenever using acids. prepare a neutral solution Students should add alkali a drop at a time to acid containing indicator and identify neutralisation. Similarly add acid to alkali. Teacher and students to wear safety glasses whenever using acids. Encourage the use of small quantities. describe the use of neutralisation to solve a
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This note was uploaded on 03/09/2011 for the course CHEM 1113 taught by Professor Ffaf during the Spring '03 term at Cambridge.

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1113_y05_sw_2 - Checkpoint Science Scheme of Work Chemistry...

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