CHEMISTRY F1 ANNUAL 2020
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THE UNITED REPUBLIC OF TANZANIA
PRESIDENT’S OFFICE
REGIONAL ADMINISTRATION AND LOCAL
GOVERNMENT
FORM I EXAMINATION
CHEMISTRY
TIME: 2:30 HOURS
NOV, 2020
1. This
paper consists of sections A, B and C.
2. Write
your examination number at the top right corner of every page.
3. ALL
writing must be in black or blue ink EXCEPT diagrams which must be in pencil.
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This paper consists of five (5) printed
pages
SECTION A (10 marks)
Answer
all questions in this section
1. For
each of the following items (i) – (x) choose the correct answer among the given
alternatives and write its letter beside the item number in the answer
booklet(s) provided (i) When a chemist studies a substance, he/she is interested in its:
A. Force
of attraction C. Smell
B. Shape D. Property
(ii)
When one melts a piece of iron it undergoes
A. Sublimation
C. combination
B. Physical
change D. Chemical
change
(iii) Which
of the following signs is likely to be found on the container of petrol?
A. Oxidant
sign C. Corrosive sign
B. Flammable
sign D. Irritant sign
(iv) Luminous
flame is likely to be formed in a Bunsen burner if
A. Air
holes are open C. Gas
supply is insufficient
B. Air
holes are closed D. There
is burning back
(v)
A mixture of liquid and solid in which small
droplets spread throughout the liquid is known as
A. Solvent C. Solution
B. Suspension D. Emulsion
(vi) A
corrosive substance
A. Can
burn your skin C. Makes
burning substances
B. Causes
fire when brought to burn faster near open flames D. Causes side effects
(vii) A
mixture of sodium chloride and ammonium chloride is separated through
A. Evaporation C. Sublimation
B. Filtration D. Funnel
separation
(viii) A
solution contains
A. Carbon
dioxide and salt C. Solute
and solvent
B. Water
and solvent D. Sand
and water
(ix) The
percentage composition of carbon dioxide in the air is
A. 0.003 C. 21
B. 0.03 D. 78
(x)
Ripening of fruit is an example of
A. Both physical and chemical C. Chemical change changes
D. A and B are correc B. Physical change
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SECTION B (20 Marks)
2. Match
the items in LIST A with the responses in LIST B by writing the letter of the
correct response beside the item number.
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LIST A |
LIST B |
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(i)
Class A fire (ii)
Chromatography (iii)
Liquid metal (iv)
Hypothesis (v)
78% by volume in air (vi)
Arsonists and burglary (vii)
A metal in common salt (viii) Mixture
of gases (ix)
Compound
(x)
Electroplating
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A.
Nitrogen B.
Air C.
Petrol is burning material D.
Separate color in dye E.
Silver F.
Use paper as combustible material G.
Test observation H.
Has no definite shape I.
Cause of fire J.
Water K. Intelligent
guess to a possible answer L.
Potassium
M.
Sodium N.
Mercury
O.
Coating method |
SECTION C (70 Marks)
Answer
all questions in this section.
3. (a)
Explain why air is said to be a mixture (4 points)
(b) (i)
Identify the steps in scientific procedure
(ii) State
any two importance of scientific procedure
(c) Give
the Latin names and symbols of the following elements
(i) Sodium
(ii) Mercury
(iii)Potassium
(iv) Gold
(v) Silver
4. (a)
State any four materials made by application of chemistry.
(b) With
reasons explain why
(i)
Laboratory windows are large (2 points)
(ii)
Laboratory doors open outward
(iii)
There is a fume chamber in the laboratory
(iv)
Laboratory floors are never polished
(c) Give
two examples in each of the following (i) Gaseous solution
(ii) Solid
solution
5. (a)
List any five types of burners and fuel they use
(b) Outline
any two possible causes of laboratory accidents
(c) Why
during experiments involving flammable chemicals electric heater is used as a
source of heat?
6. (a)
Define the following terms
(i)
Fire fighting
(ii)
Chemical change
(iii)
First aid kit
(b) Give
the uses of the following items
(i)
Antibiotics
(ii)
Sterile gauze
(iii)
Water
(iv)
Safety pins
(v)
New sterilized scalpel
(c) How
can you distinguish simple distillation from evaporation?
7. (a)
Explain
(i)
Why class E fires can never be extinguished by
using water?
(ii)
State any two significance of first aid
(b) Draw
a labeled diagram of a non-luminous flame
(c) Name
the functions of the following parts of a Bunsen burner.
(i)
Collar
(ii)
Air hole
(iii)
Base
8. (a)
Name any four safety rules that students should observe while in the
laboratory.
(b) When
water and kerosene are mixed in the same container, which one form the upper
layer? Give reason(s).
(c) Give
three differences of physical properties of a metal and a non-metal
9. (a)
Define the following terms
(i)
Immiscible liquids
(ii)
Matter
(iii)
An element
(iv)
Compound
(b) State
whether each of the following processes involves a chemical or physical change
(i) Paper
burning
(ii) Glass
breaking
(iii)Changing liquid to solid
(iv) Rusting of iron
(c) Explain
the meaning of the following terms
(i) Galvanized
iron
(ii) An
alloy
10. (a)
(i) What is the name given to the separation technique shown in the diagram?
(ii)
Name two substances which could be separated
using this technique
(iii)
Name the piece of equipment labelled A
(iv)
Would you expect to find the solid in A or B at
the end of the experiment
(b) (i)
What are the major conditions for fire to start?
(ii) Outline
any two ways used to prevent hazardous fire
(c) Give
two reasons why most of the laboratory apparatus are made of glass.