Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

IGCSEs by Thili > 🧪 | Unit 12 | Experimental techniques and chemical analysis > Flashcards

🧪 | Unit 12 | Experimental techniques and chemical analysis Flashcards

1
Q

A substance is held into the flame of a Bunsen burner using a wire. The flame turns red.

What is the substance?

A

Lithium ❤️

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

A substance is held into the flame of a Bunsen burner using a wire. The flame turns yellow.

What is the substance?

A

Sodium 💛

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

A substance is held into the flame of a Bunsen burner using a wire. The flame turns purple.

What is the substance?

A

Potassium 💜

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

A substance is held into the flame of a Bunsen burner using a wire. The flame turns orange-red.

What is the substance?

A

Calcium 🧡

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

A substance is held into the flame of a Bunsen burner using a wire. The flame turns blue-green.

What is the substance?

A

Copper (II) 💚

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the precipitate left behind on addition of NaOH to a metal cation?

A

The metal hydroxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

NaOH is added to a substance. A green precipitate is formed. In excess, it dissolves into a dark green solution.

In aqueous ammonia, a grey-green precipitate is formed which is insoluble in excess.

What is the substance?

A

Chromium (III)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

NaOH is added to a substance. A green precipitate is formed. When NaOH is added in excess, the precipitate remains insoluble.

What is the substance?

A

Iron (II)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

NaOH is added to a substance. A light blue precipitate is formed. When NaOH is added in excess, the precipitate remains insoluble.

What is the substance?

A

Copper (II)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

A red-brown precipitate is formed when a substance reacts with either aqueous ammonia or NaOH. When NaOH/ammonia is added in excess, the precipitate remains insoluble.

What is the substance?

A

Iron (III)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

NaOH is added to a substance. A white precipitate is formed. When NaOH is added in excess, the precipitate dissolves to form a colourless solution.

When NH₃ is added to the substance, a white precipitate is formed. When NH₃ is added in excess, the precipitate remains insoluble.

What is the substance?

A

Aluminium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

NaOH is added to a substance. A white precipitate is formed. When NaOH is added in excess, the precipitate dissolves to form a colourless solution.

When NH₃ is added to the substance, a white precipitate is formed. When NH₃ is added in excess, the precipitate dissolves to form a colourless solution.

What is the substance?

A

Zinc

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

NaOH is added to a substance. A white precipitate is formed. When NaOH is added in excess, the precipitate remains insoluble.

What is the substance?

A

Calcium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

NaOH is added to a substance. When it is warmed gently, ammonia is produced.

What is the substance?

A

Ammonium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Tests for Aluminium

A
  • NaOH: white precipitate formed, dissolves in excess to form a colourless solution
  • NH₃: white precipitate formed, insoluble in excess
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Tests for Zinc

A
  • NaOH: white precipitate formed, dissolves in excess to form a colourless solution
  • NH₃: white precipitate formed, dissolves in excess to form a colourless solution
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Tests for Calcium

A
  • NaOH: white precipitate formed, insoluble in excess
  • NH₃: no visible change, or a faintly visible white precipitate
  • Flame test: orange-red flame
18
Q

Tests for Chromium (III)

A
  • NaOH: green precipitate formed, dissolves in excess to form a green solution
  • NH₃: grey-green precipitate, insoluble in excess
19
Q

Tests for Copper (II)

A
  • NaOH: light blue precipitate formed, insoluble in excess
  • NH₃: light blue precipitate formed, dissolves in excess to form a dark blue solution
  • Flame test: blue-green flame
20
Q

Test for Ammonium

A
  • NaOH: Ammonia given off when warmed gently
21
Q

Tests for Iron (II)

A
  • NaOH: green precipitate formed, insoluble in excess
  • NH₃: green precipitate formed, insoluble in excess
22
Q

Tests for Iron (III)

A
  • NaOH: red-brown precipitate formed, insoluble in excess
  • NH₃: red-brown precipitate formed, insoluble in excess
23
Q

Test for CO₂

A

Bubbling through limewater
Positive obv: limewater turns milky

24
Q

Test for O₂

A

Glowing splint test
Positive obv: splint relights

25
Q

Test for H₂

A

Lighted splint test
Positive obv: a “squeaky pop” sound

26
Q

Test for Ammonia

A

Warm aqueous ammonium in a test tube and place a damp red litmus paper above the solution.
Positive obv: red litmus paper turns blue

27
Q

Test for SO₂

A

Add to acidified potassium (vii) manganate
Positive obv: purple to colourless

28
Q

Solubility of Ethanoates

A

All are soluble

29
Q

Solubility of Nitrates

A

All are soluble

30
Q

All salts of sodium, potassium and ammonium

A

All are soluble

31
Q

Solubility of Chlorides

A

All are soluble except
- silver chloride
- lead (II) chloride

32
Q

Solubility of Sulfates

A

All are soluble except
- barium sulfate
- lead (II) sulfate
- calcium sulfate

33
Q

Solubility of Carbonates

A

All are insoluble except
- sodium carbonate
- potassium carbonate
- ammonium carbonate

34
Q

Solubility of Hydroxides

A

All are insoluble except
- sodium hydroxide
- potassium hydroxide
- calcium hydroxide (slightly)

35
Q

Difference between a strong acid and a weak acid?

A

Strong acids ionize completely
Weak acids ionize partially

36
Q

Difference between a strong base and a weak base?

A

Strong bases are soluble
Weak bases are not very soluble

37
Q

Test for carbonate

A

Adding dilute acid will produce CO₂

38
Q

Test for nitrate

A

Add aqueous NaOH and aluminium foil, and warm gently. Ammonia will be produced.

39
Q

Characteristics of ammonia

A

Pungent smell, turns damp red litmus paper blue

40
Q

Test for sulfite

A

Add a dilute acid and warm gently.
The gas produced will decolourise acidified aqueous potassium (VII) manganate solution

IGCSEs by Thili (28 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions