CXC Integrated Science exam guide: Section B: Materials



CXC Integrated Science exam guide: Materials


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 VII- MATERIALS

 

Specific Objectives

Students should be able to:

Explanatory notes
Suggested Practical Activities

1

Relate the uses of metals and non-metals in the home, to their properties

Metals, plastics and wood; properties such as electrical conductivity, thermal conductivity, melting point, density, tensile strength.

 

2

Discuss the advantages and disadvantages of using plastics;

 

Negative effects on the environment of using plastics.

 

3

Describe the reactions of metals;

(Al) Aluminum; (Cu) Copper; (Fe) Iron; (Sn) Tin; (Ag) Silver; (Zn) Zinc; with oxygen, acid, alkali, water and steam.

Observe which metals react and which do not; simple word equations to show their reaction.

4

 

Discuss the advantages and disadvantages of using cooking or canning utensils made of aluminum; Copper, iron, tin, silver, zinc; consideration of toxicity and corrosion.

 

5 Discuss methods of cleaning household appliances; Household appliances made of aluminum, copper, iron, tin, silver, and zinc. Demonstrate simple methods of cleaning household appliances make of aluminum, copper, iron, tin, silver, zinc.
6 Discuss the effectiveness of various types of abrasives; Corrosion and toxicity.  
7 Discuss the benefits of using alloys to make household items; Alloy and examples of alloys commonly found in the home and workplace.  
8 Discuss the conditions which cause rusting; Steel, brass and soft solder. Tarnishing as a chemical process (oxidative).  
9 Identify the factors which affect the rate of rusting; Problems of rusting metal fixtures in houses located near the sea or an industrial plant. Controlled experiments to show that air and water are necessary for rusting.
10 Discuss methods to reduce or prevent rusting of iron or steel; Painting, covering with oil, electroplating; galvanizing; the scientific principles involved, commercial as well as household. Demonstrate ways of removing rust marks on clothing.

Go to Section B: UNIT VIII- LIGHTING

 


0
No votes yet
Your rating: None

Post new comment

The content of this field is kept private and will not be shown publicly.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Allowed HTML tags: <a> <em> <strong> <cite> <code> <ul> <ol> <li> <dl> <dt> <dd>
  • Lines and paragraphs break automatically.

More information about formatting options

CAPTCHA
This question is for testing whether you are a human visitor and to prevent automated spam submissions.
Image CAPTCHA
Enter the characters shown in the image.