01.
|
i |
ii |
iii |
iv |
v |
|
B |
C |
D |
A |
B |
02.
(a) Chemistry is the branch of chemistry which deals
with properties, composition and decomposition of matter.
(b) Matter is anything that has mass and occupies
space.
(c) Science is the study of nature.
(d) Weed
killers
are the chemical substance that are used
to destroy unwanted plants which are harmful to crops.
03. Agricultural
chemicals produced by knowledge of chemistry
i.
Weed
killers
ii.
Fertilizers
iii.
Pesticides
iv.
Insecticides
v.
Animal
vaccination
04. Importance
of chemistry
o
It
help farmers to get better agricultural yields since they use many products
made through chemical process like fertilizers.
o
It
helps in preservation of food especially those which are caned or bottled.
o
It
helps in the prevention of illness and diseases and treatment when we get sick.
o
It
helps in manufacturing of different products in industries like cements,
plastic containers, chemicals etc.
o
It
helps in manufacture of home care products like soap, detergents, polish etc.
o
It
helps to acquire different professionals like doctor, nurse and teacher.
05. Areas where the knowledge of chemistry is
applied
· In agriculture
The knowledge of chemistry is used in production of
fertilizers, pesticides, weed killers and animal vaccination.
In medicine
The knowledge of chemistry is used in manufacture of drugs,
vaccines and food supplements.
· In transport and communication
o
Letters,
newspapers and magazines are written on papers made through chemical processes.
o
Telephones
and computers (for internet) rely heavily on wires that are manufactured
chemically.
o
Parts
of different means of transport such as car engines are made through chemical
processes.
· In industries
ü
In home care and cosmetics industry, the products such as detergents,
beauty products, soaps, shoe polish, toothpaste, disinfectants, and insecticides are
produced through chemical process.
ü
In food and beverage industries, the products such as soft drinks,
common salts, yeast, baking powder and
canned food are produced through chemical process.
ü
In manufacturing industries products such as chemicals, varnishes, cements, and plastics are made through chemical process.
ü
In textile industries, clothes and dyes are made through chemical process
· At home
ü
Homecare products such as detergents, soaps, disinfectants, paints,
air fresheners, polish etc are made through chemical process. These
products are used to make the home and
its surrounds clean and more comfortable to live in.
ü
Beauty products such as nail varnish, cream, lotion and deodorants
are chemically produced. These products are used to improve one’s physical
appearance.
· At school
The knowledge of chemistry helps in preparation of different
chemicals.
