CXC Integrated Science exam guide: Section B: Chemicals



CXC Integrated Science exam guide: Chemicals


CXC Integrated Science Exam Guide

Section B-The Home/Workplace

General objectives of the section:

Candidates should demonstrate an understanding of:

1.

the soil and the sea as two most important outdoor working environments in the Caribbean and that they are both natural resources as well as ecosystems

2.

the relationship between humans and the environment in which they work

3.

the need for appropriate physical conditions such as ventilation and sanitation in the home and the workplace

4.
the inter-conversion and conservation of the different forms of energy;
5.

the occurrence of accidents and hazardous situations and safety measures used in their prevention.

UNIT VIIII- CHEMICALS

 

Specific Objectives

Students should be able to:

Explanatory notes
Suggested Practical Activities

1

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;

 

 

2

Define acids, bases and salts;

 

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.

 

3

Explain the principle of neutralization;

 

Experiments on stain removal (hydrogen); carbonate of soda for fruit stains; borax for fruit wine and tea stains

4

 

Distinguish between solutions, suspensions and colloids;

Classification of household chemicals in each category

Simple preparations of solutions, suspensions and colloids.

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;

 

The action of disinfectants, antiseptics, deodorants;  
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.  
9 Distinguish between soapy and soapless detergents. Their cleaning action; the effects of detergents on the environment.  
10 Explain how a chemical fire distinguisher functions.   Design and make a simple carbon dioxide fire extinguisher.

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

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