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iGCSE Chemistry > 5.2 Gas Tests > Flashcards

5.2 Gas Tests Flashcards

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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?

A

potassium

23
Q

What colour flame does calcium produce?

A

orange/red

24
Q

Which cation produces orange/red flame?

A

calcium

25
Q

What colour flame does copper produce?

A

blue/green

26
Q

Which cation produces blue/green flame?

A

copper

27
Q

Which cations use the sodium hydroxide test?

A

copper
iron (ii)
iron (iii)

28
Q

Describe a sodium hydroxide test

A
  1. dissolve sample in water
  2. add NaOH
29
Q

Which cation produces a blue precipitate?

A

copper

30
Q

What colour precipitate does copper produce?

A

blue

31
Q

Which cation produces a green precipitate?

A

iron (ii)

32
Q

What colour precipitate does iron (ii) produce?

A

green

33
Q

Which cation produces a brown precipitate?

A

iron (iii)

34
Q

What colour precipitate does iron (iii) produce?

A

brown

35
Q

Describe an ammonium test

A
  1. dissolve sample in water
  2. add NaOH
  3. damp red litmus
36
Q

What is the colour change of ammonium test?

A

red to blue

37
Q

What are anions?

A

negative ions

38
Q

What are positive ions called?

A

cations

39
Q

What are negative ions called?

A

anions

40
Q

How do we test for hallides?

A

silver nitrate test

41
Q

What does the silver nitrate test for?

A

hallides

42
Q

Describe the silver nitrate test

A
  1. dissolve sample in water
  2. add nitric acid
  3. add silver nitrate solution
43
Q

What colour precipitate does chloride produce?

A

white

44
Q

Which hallide produces white precipitate?

A

chloride

45
Q

What colour precipitate does bromide produce?

A

cream

46
Q

Which hallide produces cream precipitate ?

A

bromide

47
Q

What colour precipitate does iodide produce?

A

yellow

48
Q

Which hallide produces yellow precipitate?

A

iodide

49
Q

Describe a test for carbonate ions

A
  1. Add HCl
  2. effervescence
  3. limewater
50
Q

Describe a test for sulfates

A
  1. add HCl
  2. no effervescence
  3. barium chloride
51
Q

What is the change during the carbonate ions test?

A

clear -> cloudy

52
Q

What is the change during the sulphate ions test?

A

white precipitate forms

53
Q

What is the white precipitate that forms during sulphate ions test?

A

barium sulphate

iGCSE Chemistry (17 decks)

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