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UNIT VIIII- CHEMICALS
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Specific Objectives
Students should be able to: |
Explanatory notes
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Suggested Practical Activities
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1
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Discuss the uses of some common household chemicals; |
Chemical and trade names; water as the most common chemical in the home; water as a solvent used in many household chemicals;
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2
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Define acids, bases and salts;
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The concept of pH and neutrality. Classification of household items into acids, bases, and salts |
Carry out simple investigations to determine the pH values of various brands of toothpaste and interfere the effect of the pH on mouth bacteria. Use pH paper. Simple experiments on neutralization using droppers.
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3
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Explain the principle of neutralization; |
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Experiments on stain removal (hydrogen); carbonate of soda for fruit stains; borax for fruit wine and tea stains
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4
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Distinguish between solutions, suspensions and colloids;
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Classification of household chemicals in each category |
Simple preparations of solutions, suspensions and colloids.
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| 5 |
Explain the action of a solvent in stain removal |
Aqueous and non-aqueous solutions. |
Experiments on stain removal – turpentine for paint; methylated spirit for glass; acetone for nail polish |
| 6 |
Discuss the safe and economic use of some common household chemicals;
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The action of disinfectants, antiseptics, deodorants; |
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| 7 |
Distinguish between hard and soft water; |
Advantage and disadvantages of hard and soft water |
Experiment t determine the degree of hardness of water, experiments to soften samples of hard water by (a) boiling it (b) adding washing soda (c) distillation. |
| 8 |
Explain the cleaning actions of scouring powders and detergents. |
Constituents of scouring powders and detergents. |
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| 9 |
Distinguish between soapy and soapless detergents. |
Their cleaning action; the effects of detergents on the environment. |
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| 10 |
Explain how a chemical fire distinguisher functions. |
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Design and make a simple carbon dioxide fire extinguisher. |
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Go to Section B: UNIT X- MACHINES
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integrated science
does anyone know anywhere in Jamaica where i could take classes for integrated science bcuz my school doesn't offer it
help plz