Registered to Cambridge Assessment International Education, Registered Centre No. IN449 dated 16th November, 2005
No.90/2, Kadusonnapannahalli, Bidarahalli Hobli, Kannur Post, Bangalore East Taluk - 562149
Unit Test-1 July/August 2019
Subject: Chemistry
Duration: 40 minutes
Grade: 9
Maximum Marks: 25
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 Answer the questions in the space provided.
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This document consists of 7 printed pages.
1. The diagrams show particles in a container.
Which two diagrams show the process of evaporation?
A. 1
2
B. 1
3
C. 2
3
D. 3
1
2. When iodine is heated it turns from a solid to a gas.
When liquid ammonia is cooled it turns into a solid.
When ice is heated it turns into water.
Which terms describe these changes of state?
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3. Hydrogen chloride gas, HCl , reacts with ammonia gas,NH3, to form solid ammonium chloride.
The apparatus is set up as shown.
After a few minutes, solid ammonium chloride forms where the two gases meet.
The experiment is repeated using hydrogen bromide, HBr, in place of hydrogen chloride.
How far along the tube does the solid ammonium bromide form?
4. ‘Particles moving very slowly from an area of higher concentration to an area of lower
concentration.’
Which process is being described?
A. A liquid being frozen
B. A solid melting
C. A substance diffusing through a liquid
D. A substance diffusing through the air
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5. Which statement about liquids and gases is correct?
A. 1 cm3 of gas contains more particles than 1 cm3 of liquid.
B. A given mass of liquid has a fixed volume at room temperature.
C. Particles in a liquid can easily be forced closer together.
D. Particles in a liquid have fixed positions.
[Total:5]
6. a. State the name of the process that is used to
i.
Separate oxygen from liquid air,
[1]
…………………………………………………………………………………………………..
ii.
Separate the individual dyes in ink,
[1]
…………………………………………………………………………………………………..
iii.
Obtain water from aqueous sodium chloride,
[1]
…………………………………………………………………………………………………..
iv.
Separate the precipitate formed when aqueous silver nitrate is added to aqueous sodium
chloride.
[1]
………………………………………………………………………………………………….
b. State what is meant by the terms
i.
Element,
[1]
…………………………………………………………………………………………………
…………………………………………………………………………………………………
ii.
Compound,
[1]
…………………………………………………………………………………………………
…………………………………………………………………………………………………
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iii.
Ion,
[1]
…………………………………………………………………………………………………
…………………………………………………………………………………………………
[Total:7]
7. A Student heated a piece of solder carefully.
The diagram shows what happens to the solder.
[4]
Use the kinetic particle theory to describe and explain what happens to the solder as it changes state.
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…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
[Total:4]
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8. Matter can exist as solid, liquid or gas. The arrows show come changes of state.
a) Name the changes of state represented on the diagram.
[3]
A. ………………………………………………………………………..
B. ………………………………………………………………………..
C. ………………………………………………………………………..
b) Explain why energy has to be supplied to turn a liquid into a gas.
[1]
…………………………………………………………………………………………………
…………………………………………………………………………………………………
c) The diagrams represent the same number of particles of gas in two containers, D and E,
which have different volumes. The two containers are at the same temperature.
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In which container will the pressure be higher? Explain your answer.
[1]
…………………………………………………………………………………………………
…………………………………………………………………………………………………
[Total:5]
9. Three dye mixtures, J,K and L, were spotted onto a piece of chromatography paper. Three pure dyes,
X,Y and Z, were also spotted onto the same piece of paper.
The diagram shows the results of this chromatography.
i.
Suggest why the base line was drawn in pencil and not in ink.
[1]
…………………………………………………………………………………………………
ii.
Which dye mixture, J,K or L, contains a dye which did not move during this
chromatography?
[1]
…………………………………………………………………………………………………..
iii.
Which dye mixture, J,K or L, contains both dye X and dye Y?
[1]
…………………………………………………………………………………………………
iv.
Which dye mixture, J,K or L, does not contain dye Z?
[1]
…………………………………………………………………………………………………..
[Total:4]
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