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Practical Skills
Test Description: Practical skills for IGCSE
Instructions: Answer all questions to get your test result.
1) The commenest drying agents are:
A
Concentrated sulfuric acid - is used to dry all gases except ammonia
B
Anhydrous calcium chloride is udes for all gases except ammonia, which forms a complex with calcium chloride e
C
all of the above
D
Calcium oxide is used to dry ammonia and neutral gases
2) Methods of collecting gases are:
A
All of the above plus Collection in a gas syring is useful when the volume of gas needs to be measured
B
Upward delivery is used for gases that are less dense than air
C
Downward delivery is used to collect gases that are denser than air
D
Collection over water is used for gases that are not very soluble in water
3) When describing a test
A
don't worry about it
B
Do I have to write something?
C
always give the colour before and after the change.
D
Really?
4) The test for unsaturated compounds such as an alkene is:
A
Add NaOH
B
Add bromine water
C
There is a test?
D
Add HCl
5) Ethanol and ethanoic acid provide a test for each other because
A
What was the compound again?
B
Not sure
C
What is ethanol?
D
with the addition of a few drops of concentrated sulfuric acid they produce a sweet smelling ester
6) Chromatography is used to:
A
add bromine water
B
separate both coloured and uncoloured substances with the use of a locating agent once the chromatogram has been produced
C
separate coloured substances
D
Not sure
7) If you are asked for a chemical test for water:
A
See if it is wet
B
Use CoCl or CuSO4 - while these tests will tell you if water is present they will not tell you if it is pure the BP will
C
Test the boiling point
D
Not sure
8) If you add NaOH to Iron(III) it will form what coloured precipitate?
A
Light blue
B
Brown
C
Green
D
Grey-green
9) If you add NaOH to Cu2+ it will form what coloured precipitate?
A
Green
B
Grey-green
C
Light blue
D
Brown
10) If you add NaOH to Cr3+ it will form what coloured precipitate?
A
Light blue
B
Grey-green
C
Blue
D
Brown
*select an answer for all questions
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