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C8 Gas Tests and Separating Mixtures FT (05/02/2026)

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Last updated 3 months ago
20 questions
4.8.1.1 Pure substances
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1
4.8.1.1
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4.8.1.1
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4.8.1.1
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4.8.1.1
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4.8.1.1
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4.8.1.1
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4.8.1.1
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4.8.1.1
5.5.A
Required
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4.8.1.1
4.8.1.3 Chromatography
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4.8.1.3
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4.8.1.3
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4.8.1.3
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4.8.1.3
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4.8.1.3
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4.8.1.3
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4.8.1.3
4.8.2 Identification of common gases
1
4.8.2.1
4.8.2.2
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Question 1
1.

Question 2
2.

Question 3
3.

Question 4
4.

Question 5
5.

Question 6
6.

Question 7
7.

Explain why salt is placed on roads in winter months?

Question 8
8.
Question 9
9.

Question 10
10.

1
Question 11
11.

How many substances are in dye A?

4.8.1.3
1
4.8.1.3
2
4.8.1.1
4.8.1.3
Question 14
14.

Question 15
15.

Why is the start line drawn in pencil rather than pen?

Question 16
16.

Question 17
17.

Question 18
18.

Question 19
19.

Question 20
20.

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A pure substance has to be an element
True
False
A mixture is always an impure substance.
True
False
Impure substances have higher boiling points
True
False
Salt is put on ice to increase the melting point.
True
False
Identify 2 differences between pure and impure substances
Pure substances have very specific melting and boiling points
Pure substances are made from one type of substance
Impure substances are made of one type of substance
Impure substances have very specific melting points
What happens to the melting point of water when impurities are added?
Increases
Decreases
Not affected at all
Stays the same
Simple distillation allows us to separate liquids with different boiling points.
True
False
Question 12
12.

How many substances are in Dye B?

Question 13
13.

Explain how the chromatogram shows that A is a pure substance and B is a mixture.

In chromatography, ink is the solvent.
True
False
Chromatography allows us to separate different elements in a compound.
True
False
In chromatography, the dyes are soluble in water.
True
False
What colours are in substance P?
1
2
3
4
5
6
Put the order of Chromatography in order
When the solvent has almost reached the top of the filter paper, remove it from the beaker
Lay the paper flat and leave it to dry
Use a ruler to measure the distance the ink spot has travelled (Rf values)
Place a spot of ink on the pencil line
Carefully add the solvent to a level just below the ink spot, taking care not to splash the paper
Cover the beaker and wait a few minutes
Draw a line with a pencil and ruler to one end of the strip of filter paper
Suspend the filter paper in a beaker so it isn't touching the sides or the bottom
Match the gas test to its positive result
Put Damp litmus paper into the gas
Limewater turns milky (cloudy)
Hold a burning splint at the open end of a test tube of the gas
Litmus paper is bleached and turns white
Place a glowing splint in a test tube of the gas
A squeaky pop sound is produced
Shakes or bubble the gas through limewater
The splint relights.