MANG'U HIGH SCHOOL
NAME: _DARREN N. GISORE___________________________
CLASS:_1 EDB____________
CANDIDATES SIGN: _DARRREN______
ADM.NO._27212______
DATE:__________
CHEMISTRY
FORM 1
APRIL ASSIGNMENT
Instructions to Candidates
(i)
(ii)
(iii)
Write your Name, Adm. No, Class, Sign and Write the date.
Answer ALL questions.
Answers to all questions should be answered in the spaces provided after
each question.
For examiners use only
Question
Candidates score
1 - 19
This paper consist of 6 printed pages. Candidates should check on the question paper to
ascertain that all pages are printed as indicated and that no question is missing.
Turn Over
1
1.
Give three differences between a luminous flame and a non –luminous flame.
(3mks)
1. Luminous flame produces soot while non-luminous doesn’t
2. Luminous flame has 4 layers while non-luminous has 3 layers
3. Non-luminous is hotter than luminous
2.
Draw a well labeled diagram of non-luminous flame.
(4mks)
3.
Explain how the hotness of a flame can be increased.
(1mk)
It can be increased by closing the air hole.
4.
5.
Give the uses of the following parts of a Bunsen burner.
(2mks)
– It allows the lab gas into the chimney.
(i)
Jet
(ii)
Air hole
– Allows air to enter and mix with the lab gas.
Bright yellow zone is found in a luminous type of flame. Give the reason for its
production.
(2mks)
For it consists of mainly tiny unburnt particles of hot glowing solid carbon which gives out light.
2
6.
It is always advisable that non-luminous to be put off after use or adjusted to a
luminous flame. Explain
(1mk)
For it may cause fire incidents for it isn’t visible.
7.
8.
A wooden splint was slipped through a region of a particular flame in the
laboratory and was burnt as shown.
Name the type of flame the splint was slipped through
(1mk)
Define the following terms
(3mks)
Saturated solution
ii.
temperature.
Solute A substance that dissolves in a liquid.
Sublimation The process where a substance changes from solid to gas directly.
iii.
9.
Is one in which no more solute can dissolve at a given
i.
Briefly describe how a mixture of iodine, sand, iron fillings and sodium chloride
can be separated and obtain sample of each.
(4mks)
3
10.
Identify the most suitable methods used to separate the following mixtures.
(3mks)
(i)
A mixture of sulphur and aluminium chloride.
(ii)
A mixture of water and oil
Use of a separating funnel.
(iii)
Extraction of oil from nuts
Solvent extraction.
11.
The diagram below shows a set up that can be used to separate two miscible
liquids, R (B.P. 79oC) and P (B.P. 98oC). Study it and answer the questions that
follow
(a)
Name T ……………………………………..
(b)
Identify substance N and state its role in the set up above.
(2mks)
(c)
With a reason, which liquid was collected first?
(1mk)
(d)
State the function of sand in the set-up above.
(1mk)
4
S ……………………………………..
(2mks)
(e)
12.
Give a reason why it is possible to separate the above mixtures. (1mk)
The table below shows liquids that are miscible wand those that are immiscible
Liquid
W
X
Y
Miscible
Miscible
Z
Miscible
Immiscible
Describe how a mixture of W and X can be separated.
(2mks)
13.
Draw a well labeled diagram of the most suitable set of apparatus that can be
used to separate a mixture of sand and water.
(2mks)
14.
Give two advantages of carrying out experiments in apparatus made of glass.
(2mks)
15.
The diagram below shows the relationship between the physical states of matter.
Study it and answer the questions below
5
(a)
Identify processes
(2mks)
C …………………………………………………..
(b)
D …………………………………………..
Name two substances which can undergo the processes represented by E and
F
(2mks)
16.
State the functional difference between a dropping funnel and separating funnel.
(1mk)
17.
State two laboratory rules that should be followed to prevent fire accidents.
(2mks)
18.
Draw and name two apparatus that can be used to measure fixed and accurate
volumes of liquids.
(4mks)
19.
State the harmful effects of prolonged use of the following drugs
i.
Tobacco
ii.
Alcohol
6
20. write the chemical symbols of the following elements
I. copper
ii. lead
iii. Mercury
iv. silver
v. gold
vi. potassium
21. give the elements presents in the following compounds
I. potassium manganate (vii)
ii zinc carbide
iii. Lead bromide
iv sodium hydrogen suplhate
22. describe how oil is obtained from groundnuts (3mks)
23. state 5 importance of studying chemistry. (5mks)
24. state two applications of effects of impurities on melting point of solids. (2mks)
7