Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Chemistry P2 > Chemical Analysis > Flashcards

Chemical Analysis Flashcards

1
Q

What is a pure substance?

A

A substance containing a single element or compound (that is not mixed with another substance)

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

What is an impure substance?

A

A substance containing more than one type of element or compound in a mixture.

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

How do you calculate the Rf value?

A

Distance moved by substance / distanced moved by solvent

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

What numbers will the Rf value always be between?

A

0 and 1

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

In chromatography, what is shown by how far the substance moves up the paper?

A

Higher up = more soluble

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

In chromatography, what does it mean if a substance produces only one spot?

A

It is pure

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

In chromatography, why must the line be drawn in pencil?

A

Pen would dissolve and travel up the paper

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

What is the test for hydrogen?

A

Hold a lit splint near gas.
Positive = squeaky pop sound

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

What is the test for oxygen?

A

Hold glowing splint near gas.
Positive = splint relights

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

What is the test for carbon dioxide?

A

Bubble gas through limewater.
Positive = limewater turns cloudy

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

What is the test for chlorine?

A

Hold piece of damp litmus paper near gas.
Positive = litmus paper bleached white

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

How do you test for aluminium ions?

A

Slow addition of excess sodium hydroxide solution
Positive = white precipitate that eventually dissolves.

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

How do you test for calcium ions?

A

Addition of excess sodium hydroxide solution
Positive = white precipitate that does not dissolve.

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

How do you test for magnesium ions?

A

Addition of excess sodium hydroxide solution
Positive = white precipitate that does not dissolve.

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

How do you test for copper (II) ions?

A

Add sodium hydroxide solution
Positive = blue precipitate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How do you test for iron (II) ions?

A

Add sodium hydroxide solution
Positive = green precipitate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

How do you test for iron (III) ions?

A

Add sodium hydroxide solution
Positive = brown precipitate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

How do you test for carbonate anions?

A

Add dilute acid
Positive = CO2 gas formed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

How do you test for chloride anions?

A

Add silver nitrate solution in presence of nitric acid
Positive = white precipitate formed

20
Q

How do you test for bromide anions?

A

Add silver nitrate solution in presence of nitric acid
Positive = cream precipitate formed

21
Q

How do you test for iodide anions?

A

Add silver nitrate solution in presence of nitric acid
Positive = yellow precipitate formed

22
Q

How do you test for sulfate anions?

A

Add barium chloride solution in presence of hydrochloric acid
Positive = white precipitate formed

23
Q

Flame tests: what is the positive result for lithium?

24
Q

Flame tests: what is the positive result for sodium?

25
Q

Flame tests: what is the positive result for potassium?

26
Q

Flame tests: what is the positive result for calcium?

A

Orange-red

27
Q

Flame tests: what is the positive result for copper?

28
Q

What is instrumental analysis?

A

Using complex scientific equipment to identify substances.

29
Q

What are 3 advantages of instrumental analysis?

A

Quick, accurate, sensitive

30
Q

What information does flame emission spectroscopy produce?

A

The wavelength of light given off by metal in a flame
To identity of the metal and its concentration

31
Q

What group of the Periodic Table are the halogens found in?

32
Q

What are ions of Group 7 elements known as?

A

Halide ions

33
Q

What is added to halide ions when tested for?

A

Nitric acid, then silver nitrate

34
Q

What precipitate is formed by a chloride ion? (in nitric acid + silver nitrate solution)

35
Q

What precipitate is formed by a bromide ion? (in nitric acid + silver nitrate solution)

36
Q

What precipitate is formed by an iodide ion? (in nitric acid + silver nitrate solution)

37
Q

What are flame tests used to test for?

A

Alkali metals

38
Q

What group on the Periodic Table is the alkali metals?

39
Q

What colour does a flame turn when lithium ions are present?

40
Q

What colour does a flame turn when sodium ions are present?

A

Yellow-orange

41
Q

What colour does a flame turn when potassium ions are present?

42
Q

What colour does a flame turn when calcium ions are present?

43
Q

What colour does a flame turn when barium ions are present?

A

Apple green

44
Q

What is the mobile phase in chromatography?

A

The solvent that moves through the paper, carrying different substances with it

45
Q

What is the stationary phase in chromatography?

A

It is contained on the paper and does not move through it (e.g: chromatography paper)

Chemistry P2 (10 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions