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iGCSE Chemistry > 5.2 Gas Tests > Flashcards

5.2 Gas Tests Flashcards

(53 cards)

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1
Q

How do we test for Hydrogen?

A

squeaky pop test

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2
Q

How do test for Oxygen?

A

glowing splint test

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3
Q

How do we test for Water?

A

anhydrous copper sulphate

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4
Q

What is the colour change in the chemical test for water?

A

white to blue

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5
Q

What is the physical test for water?

A

boiling point 100 degrees Celsius

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6
Q

How do we test for Carbon Dioxide?

A

white precipitate forms - turns cloudy

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7
Q

How do we test for Chlorine?

A

damp blue litmus paper

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8
Q

What is the colour change when testing for Chlorine?

A

blue to white (bleaches)

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9
Q

How do we test for Ammonia?

A

damp red litmus paper

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10
Q

What is the colour change when testing for Ammonia?

A

red to blue

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11
Q

What are cations?

A

positive ions

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12
Q

How do we test for cations?

A

flame test
sodium hydroxide test
ammonium test

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13
Q

Describe a flame test

A
  1. dip platinum wire into HCl
  2. dip into solution
  3. Bunsen flame
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14
Q

Why is a platinum wire used in a flame test?

A

does not colour the flame

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15
Q

Why is Hydrochloric acid used in a flame test?

A

clean the wire

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16
Q

What type of flame is used in a flame test?

A

non luminous Bunsen flame

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17
Q

What colour flame does Lithium produce?

A

red

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18
Q

Which cation produces red flame?

A

Lithium

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19
Q

What colour flame does Sodium produce?

A

yellow

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20
Q

Which cation produces yellow flame?

A

Sodium

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21
Q

What colour flame does potassium produce?

A

lilac

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22
Q

Which cation produces lilac flame?

23
Q

What colour flame does calcium produce?

24
Q

Which cation produces orange/red flame?

25
What colour flame does copper produce?
blue/green
26
Which cation produces blue/green flame?
copper
27
Which cations use the sodium hydroxide test?
copper iron (ii) iron (iii)
28
Describe a sodium hydroxide test
1. dissolve sample in water 2. add NaOH
29
Which cation produces a blue precipitate?
copper
30
What colour precipitate does copper produce?
blue
31
Which cation produces a green precipitate?
iron (ii)
32
What colour precipitate does iron (ii) produce?
green
33
Which cation produces a brown precipitate?
iron (iii)
34
What colour precipitate does iron (iii) produce?
brown
35
Describe an ammonium test
1. dissolve sample in water 2. add NaOH 3. damp red litmus
36
What is the colour change of ammonium test?
red to blue
37
What are anions?
negative ions
38
What are positive ions called?
cations
39
What are negative ions called?
anions
40
How do we test for hallides?
silver nitrate test
41
What does the silver nitrate test for?
hallides
42
Describe the silver nitrate test
1. dissolve sample in water 2. add nitric acid 3. add silver nitrate solution
43
What colour precipitate does chloride produce?
white
44
Which hallide produces white precipitate?
chloride
45
What colour precipitate does bromide produce?
cream
46
Which hallide produces cream precipitate ?
bromide
47
What colour precipitate does iodide produce?
yellow
48
Which hallide produces yellow precipitate?
iodide
49
Describe a test for carbonate ions
1. Add HCl 2. effervescence 3. limewater
50
Describe a test for sulfates
1. add HCl 2. no effervescence 3. barium chloride
51
What is the change during the carbonate ions test?
clear -> cloudy
52
What is the change during the sulphate ions test?
white precipitate forms
53
What is the white precipitate that forms during sulphate ions test?
barium sulphate

iGCSE Chemistry (17 decks)

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