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C8 Chemical Analysis

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Last updated 25 days ago
61 questions
4.8.1.1 Pure substances
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4.8.1.2 Formulations
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4.8.1.3 Chromatography
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4.8.2 Identification of common gases
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4.8.3.1 Flame Tests
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4.8.3.2 Metal Hydroxides
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4.8.3.3/4/5 Antions (Carbonate, Halide, Sulfate)
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4.8.3.6 Instrumental Methods
4.8.3.7 Flame Emission Spectroscopy
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Question 1
1.

A pure substance has to be an element

Question 2
2.

A mixture is always an impure substance.

Question 3
3.

Impure substances have higher boiling points

Question 4
4.

Salt is put on ice to increase the melting point.

Question 5
5.

Identify 2 differences between pure and impure substances

Question 6
6.

What happens to the melting point of water when impurities are added?

Question 7
7.

Many people would say that spring water is pure. Is this a pure substance? Explain your answer.

Question 8
8.

A student compared a sample of isooctane with some petrol. The student found that the octane boiled at 99°C while the petrol boiled between 45 and 95°C. Which of these is a pure substance? Explain your answer.

Question 9
9.

Explain why salt is placed on roads in winter months?

Question 10
10.
Question 11
11.

Question 12
12.

A green ink contains 85% yellow dye and 15% blue dye.
Determine the simplest whole number ratio of yellow dye : blue dye in the green ink.

Yellow dye : Blue dye =

Question 13
13.

A fertiliser contains 0.225 g of iron per 3.0 g of fertiliser.

Which calculation gives the percentage of iron in the fertiliser?

Tick one

Question 14
14.

Formulations have specific amounts of each chemical

Question 15
15.

Diesel is a formulation. What is a formulation?

Question 16
16.

Simple distillation allows us to separate liquids with different boiling points.

Question 17
17.

Use the ruler tool on this chromatogram - you will need this to answer the next questions.

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Question 25
25.

Question 26
26.

In chromatography, ink is the solvent.

Question 27
27.

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

Question 28
28.

Chromatography allows us to separate different elements in a compound.

Question 29
29.

In chromatography, the dyes are soluble in water.

Question 30
30.

What colours are in substance P?

Question 31
31.

Match the gas test to its positive result

Draggable itemarrow_right_altCorresponding Item
Put Damp litmus paper into the gas
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Limewater turns milky (cloudy)
Hold a burning splint at the open end of a test tube of the gas
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Litmus paper is bleached and turns white
Shakes or bubble the gas through limewater
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A squeaky pop sound is produced
Place a glowing splint in a test tube of the gas
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The splint relights.
Question 32
32.

This question is about gas tests - sort into Tests and Results

  • Limewater turns milky (cloudy)
  • Place a glowing splint in a test tube of the gas
  • Shakes or bubble the gas through limewater
  • A squeaky pop sound is produced
  • Put Damp litmus paper into the gas
  • The splint relights
  • Litmus paper is bleached and turns white
  • Hold a burning splint at the open end of a test tube of the gas
  • Test
  • Result
Question 33
33.

Put the order of Chromatography in order

  1. When the solvent has almost reached the top of the filter paper, remove it from the beaker
  2. Cover the beaker and wait a few minutes
  3. Place a spot of ink on the pencil line
  4. Carefully add the solvent to a level just below the ink spot, taking care not to splash the paper
  5. Use a ruler to measure the distance the ink spot has travelled (Rf values)
  6. Draw a line with a pencil and ruler to one end of the strip of filter paper
  7. Lay the paper flat and leave it to dry
  8. Suspend the filter paper in a beaker so it isn't touching the sides or the bottom
Question 34
34.

Question 35
35.
Other Answer Choices:
Question 36
36.

Draggable itemarrow_right_altCorresponding Item
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red
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yellow
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Lilac
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orange-red
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blue-green
Question 37
37.

Question 38
38.

Question 39
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Question 40
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Question 41
41.

Question 42
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Question 43
43.

Question 44
44.

Question 45
45.

Question 46
46.

Question 47
47.

Question 48
48.

Question 49
49.

Match the metal hydroxide with its color reaction.

Draggable itemarrow_right_altCorresponding Item
Copper(II) hydroxide
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White precipitate
Iron(III) hydroxide
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Blue precipitate
Aluminium hydroxide
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Brown precipitate
Question 50
50.

Question 51
51.

Question 52
52.

Question 53
53.
Question 54
54.

Draggable itemarrow_right_altCorresponding Item
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arrow_right_alt
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Question 55
55.

Question 56
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Question 57
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Question 58
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Question 59
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Question 60
60.

Question 61
61.

Question 18
18.

How many substances are in dye A?

Question 19
19.

How many substances are in Dye B?

Question 20
20.

Calculate the Rf value for substance P

Question 21
21.

Calculate the Rf value for substance Z

Question 22
22.

Calculate the Rf value for substance Y

Question 23
23.

Calculate the Rf value for substance X

Question 24
24.

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