SAMPLE OF ANSWER

EXISTENCE OF CHEMICALSIn chemistry, all substance is considered as chemical.We use chemicals in almost every aspect of our life.

a) Name and briefly explain about at least 3 chemicals used in each of following fields.

FIELDS CHEMICAL USED1 Medicine Aspirin,

formaldehyde,drugs,Analgesics,Antibiotics, antacid ( magnesium Oxide )

2 Agriculture Urea, ammonia, sulphuric acid,

3 Food Processing

Acetic acid, Monosodium glutamate, sodium chloride, Carbon dioxide

4 Communication Silicon,Vinyl chloride,germanium, boron

5 Construction Calcium hydroxide,silicon dioxide,Iron,Vinyl chloride

6 Transportation Iron, Aluminium, Silicon, hydrocarbon( methane, kerosene, petrol)

7 Household Sodium hydroxide, Stainless steel ( iron, chromium,copper, antimony)

*all related answers are accepted

b) Chemicals such detergent,soaps, food additives and medicine play an important role in our life. Explain it.These chemicals help us to improve our quality of life.

c) Chemicals also can cause side effect on life and environment. Give two examples.

Medicine –taking medicine without doctor’s prescription such as taking ecstacy ( drug) causes depression.

Food additives- taking too much food additive can cause diseases like cancer, asthma, allergy and hyperactive.

c) State 2 common traits among scientists in carrying out research.

Patience Meticulousness Perseverance Observance Has good skill

d) Suggest some proper management of chemicals of the chemicals below.

Chemical Proper Management Detergents Use biodegrable detergents

Use approciate amounts of detergents Wear gloves when working with

strong detergents to protect your hand

Food additives Be a wise consumer. Read label to know what you are eating

Avoid consuming too much salt and sugar

Read up to know about food additives Avoid foodstuff with additives which

you are sensitive to. Avoid rewarding children with junk

food

Medicines No self-medication Do not take medicine prescribed for

someone else Do not store up medicine Check for expired date Follow your doctor’s instructions for

taking medicine Keep away from children Do not overdose

EXISTENCE OF CHEMICALS

In chemistry, all substance is considered as chemical.We use chemicals in almost every aspect of our life.

a) Name and briefly explain about at least 3 chemicals used in each of following fields.FIELDS CHEMICAL USED

1 Medicine

2 Agriculture

3 Food Processing

4 Communication

5 Construction

6 Transportation

7 Household

b) Chemicals such detergent,soaps, food additives and medicine play an important role in our life. Explain it.c) Chemicals also can cause side effect on life and environment. Give two examples.

c) State 2 common traits among scientists in carrying out research.

d) Suggest some proper management of chemicals of the chemicals below.

Chemical Proper Management Detergents

Food additives

Medicines