SCIENCE AND SOCIETY
1. The basic unit of chemical substances is = Atom
2. List three constituents of atom and their respective charges =
Constituents Charge
i. Proton +ve
ii. Electron -ve
iii. Neutron nil
3. State the constituent elements of the following compounds
i. C6 H1206(ii) NaC1 (iii)CaC03 (iv) H2S04
Answer:
i. = Carbon, Hydrogen and Oxygen
ii. Sodium and Chlorine
iii. Calcium, Carbon and Oxygen
iv. = Hydrogen, Sulphur and Oxygen
4. Define a non-renewable material Resource and give four example of it .
Answer: A non-renewable material resource is a resource said to be limited in supply i.e. it is exhaustible. E.g. i. Crude petroleum ii. Coal deposit iii. Iron ore and iv. Gold
5. The gradual use up of a non-renewable resource is known as? Answer: Depletion of half life of a resource.
6. The three factors that can help to mitigate the scarcity of a non-renewable resource are: a. Technological invention b. Substitution & c. Recycling
7. The efficiency of petrol can be described as: Octane number
8. The method of converting heavy hydrocarbon molecules to lighter ones is: Cracking
9. A common impurity in petrol is: Sulphur
10. List three gaseous pollutants in air with at least one adverse effect each: i. Carbon Monoxide (CO); it poison the respiratory system by forming Carbon haemoglobin with haemoglobin, hence there is shortage of oxygen in the system ii. Sulphur dioxide (SO2); This is mainly responsible for rain which attack metals and textile materials iii. Carbon dioxide ; (CO2); this is a greenhouse gas, hence it leads to global warning i.e increase in the temperature of the earth
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