END OF MAY TEST
CHEMISTRY
Marks:
Time: 2 hours
70
NAME: ________________________________ Surname_______________________________
INSTRUCTIONS
1. Write your name and in the spaces provided above.
2. Write your answers in the spaces provided on the question paper.
3. Answer all 9 questions
4. Read all questions carefully before attempting to answer them.
This question paper contains 7 printed pages
DO NOT TURN THE PAGE UNTTIL YOU ARE TOLD TO DO SO
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1.
a) What are the three states of matter? …………………… ,……………………….,
………………
[3]
b) Fill in the blanks with the given words below;
Freezing, boiling, condensation, evaporation, melting, sublimation.
i) Solid changing into a liquid……………………………………………… ………
[1]
ii) Liquid changing into a solid …………………………………………...……….…. [1]
iii) Gas changing into liquid
………………………………………………..…… [1]
iv) Water slowly disappearing from a boiling point…………………………………… [1]
2. Use kinetic theory to describe the process of melting.
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…………………………………………………………………………………………………[2]
2. Describe the following;
[3]
(i)
Movement of particles in solids.
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(ii)
Speed of particles in gases.
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(iii)
Compressibility of gases.
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3. Steam from boiling water occupies more volume of a container than water. Explain this
observation.
[2]
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4. The diagram below shows two gases inside a glass tube. Use the diagram to answer the
questions below.
a. At which point will the two gases meet?...............................................................
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[1]
b. Explain your answer to (a) above.
[2]
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c.. Explain how increase in temperature increases the rate of diffusion.
[2]
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5. Look at the structures of the following elements and answer the question below;
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a. What can you say about the arrangement of electrons in both elements?
[1]
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b. Define the following terms;
Atomic number
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Mass number
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Isotope
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Group.
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(ii)
Period.
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…………………………………………………………………………………………………[5]
6. a) What period are the following elements in?
a. He _______________
b. Ge _________________
[2]
b) . Oxygen and Sulphur are found in group vi? Give a reason why both elements were placed in
the same group.
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c). Explain, in terms of electrons, why rubidium is more reactive than sodium.
[2]
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7. The diagram below shows elements in the Periodic Table.
Na
Be
B
C
N
O
F
a) To which period of the periodic table do this elements belong?
Ne
[1]
b) Write down the symbol for the element which;
i)
has five electrons in its outer shell…………………….
ii)
is a halogen……………………
iii)
is a metal that reacts vigorously with cold water………………….
iv)
Forms an ion with a charge of +2……………………………
v)
Is used for advertising………………..
vi)
Reacts with oxygen to form a ionic compound…………………….
vii)
Forms a diatomic molecule…………………………..
viii) Has full outermost shell………………………..
[8]
8. Dilute hydrochloric acid is added to four substances as shown in Table below. Some
results obtained are shown in the table.
Metal
Name of solution formed
1. Magnesium
_______________________
carbonate
2. Magnesium
Magnesium chloride
Gas given off
Carbon dioxide
3. Calcium hydroxide
_________________________
_________________________
4. Barium sulphate
__________________________
No gas given off
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a) Fill up the blanks in the table above.[5]
b) Describe a test of gas given off in (1)
Test of gas
……………………………………………………………………………
Results………………………………………………………………………………………………
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[2]
c) Copper reacts with diluted nitric acid.
__ZnCO3(aq) +__HNO3(aq)
__Zn(NO3)2(aq) + __H2O(l) + __CO2(g)
[1]
i)
Balance the equation of the reaction.
ii)
Suggest what you would observe when zinc carbonate reacts with diluted nitric
acid.
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(b) (i) Suggest the name of the salt of formula Zn(NO3)2…………………………………
[1]
(ii) Write the correct formula of the following named compounds.
Sodium chloride______________________ Iron (iii) hydroxide ____________________
Magnesium phosphate__________________ Ammonium nitrate__________________
Copper (ii) Sulphate___________________ Calcium Oxide______________________
Potassium Carbonate___________________ Magnesium hydroxide________________
Aluminium Oxide__________________________
[9]
c)Balance the following chemical equations.
i)
____ N2 +____ O2 
ii)
____ KI + ____ Cl2 
iii)
____ C2H6 + ____ O2 
____ N2O
____ KCl + ____ I2
____ CO2 + ____ H2O
.
9. (i) What is the mass of 0.7mol of hydrated copper(II) sulphate( CuSO4.5H2O) crystals?
[3]
[2]
(ii) Calculate the mass of oxygen required to completely react with 0.6g of magnesium to form
magnesium oxide.
2Mg(s) + O2(g)
2MgO(s)
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mass of oxygen___________g
[3]
c) What is the mass of tartaric acid (C4H6O6) needed to make 150 cm3 of a 0.150 mol / dm3
solution?
Mass ______________g [3]
P O Box 10816 Palapye | Plot 24018 Phase 4 Gaborone | 75321663
P O Box 10816 Palapye | Plot 24018 Phase 4 Gaborone | 75321663