Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

IGCSE Chemistry > Chemical Analysis > Flashcards

Chemical Analysis Flashcards

1
Q

What is the gas test for hydrogen?

A

A Burning Splint

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

What is the positive result for the hydrogen test?

A

The burning splint explodes with a pop

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

What is the gas test for oxygen?

A

A Glowing Splint

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

What is the positive result for the Oxygen test?

A

The glowing splint reignites

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

What is the gas test for Carbon Dioxide?

A

Limewater

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

What is the positive result for the Carbon Dioxide test?

A

Limewater turns cloudy.

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

What is the gas test for Chlorine?

A

Damp Blue Litmus

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

What is the positive result of the gas test for Chlorine?

A

The damp blue litmus turns red, then white.

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

What is the gas test for Ammonia (NH3)?

A

Damp Red Litmus

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

What is the positive result for the gas test for Ammonia

A

The damp red litmus turns blue

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

How does the burning splint tell us Hydrogen gas is made?

A

It makes hydrogen react with oxygen, which is highly EXOTHERMIC, and therefore creates the pop noise.

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

How does the Glowing Splint tell us Oxygen gas is made?

A

Oxygen is required for combustion, and the flame on the glowing splint is about to extinguish. If placed in oxygen, it will reignite. This tells us Oxygen gas is made.

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

How does limewater tell us Carbon Dioxide gas is made?

A

Limewater is Ca(OH)2. It reacts with Carbon Dioxide to make CaCO3, a white precipitate. Therefore the limewater turns cloudy.

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

How does the damp blue litmus tell us that Chlorine gas is made?

A

Chlorine reacts with water to make HCl. HCl reacts with indicator on the paper to go from blue (base) -> red (acid). If this happens Chlorine gas was made. Later, the Chloric acid will make the paper turn white.

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

How does the damp red litmus tell us that Ammonia (NH3) gas is made?

A

Ammonia is a base, and therefore it will react with the indicator on the paper, going from red (acid) -> blue (base). If this happens, Ammonia gas was made.

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

What is the basic method for a gas test?

A

Place each specific test inside a test tube producing an unknown gas, until one of them produces a positive result.

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

What color do Lithium compounds produce in the flame test?

A

Red

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

What color do Sodium compounds produce in the flame test?

A

Yellow/Orange

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

What color do Potassium compounds produce in the flame test?

A

Lilac

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What color do Calcium compounds produce in the flame test?

A

Brick red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What color do Barium compounds produce in the flame test?

A

Light green or apple green

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What color do Copper compounds produce in the flame test?

A

Blue/green

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is the basic method for the flame test?

A
  1. Clean needle with HCl until it doesn’t change the color of the flame
  2. Place needle in compound and then in fire
  3. Observe flame color
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What result from the halide test tells us Chloride was present?

A

White precipitate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
What result from the halide test tells us Bromide was present?
Cream precipitate
26
What result from the halide test tells us Iodide was present?
Yellow Precipitate
27
Which anion was present if the precipitate turns dark grey when exposed to Ultra-Violet light
Chloride
28
What is the basic method for a Halide Test
1. Add Nitric Acid to remove Hydroxide and Carbonate ions 2. Add SilverNitrate and observe precipitate
29
Why do we react SilverNitrate with the compound?
Because Silver Halides, which will be made if the unknown compound is soluble, are insoluble. Therefore it is a precipitation reaction, and we can identify which halide it is based on color of precipitate.
30
Example: what is the Ionic equation for the reaction: (X = unknown anion) AgNO3 + NaX --> AgX + NaNO3
Ag+ + X- --> AgX
31
What is the basic method to test for Ammonium (NH4+) Cations?
1. Add NaOH and heat chemical 2. If a gas is made, put damp red litmus in it 3. Observe color of damp red litmus
32
What is the positive result for the Ammonium (NH4+) test?
Damp red litmus turns blue.
33
Why does the damp red litmus turn blue if Ammonium (NH4+) was present?
The reaction makes Ammonia (NH3). This is a base and. makes the indicator on the litmus go from red (acid) --> blue (base)
34
What gas is made if a burning splint explodes with a pop?
Hydrogen
35
What gas is made if a glowing splint reignites?
Oxygen
36
What gas is made if limewater goes cloudy?
Carbon Dioxide
37
What gas is made if damp blue litmus turns red then white?
Chlorine
38
What gas is made if damp red litmus turns blue
Ammonia (NH3)
39
What Cation is present if the flame turns red?
Lithium
40
What Cation is present if the flame turns yellow?
Sodium
41
What Cation is present if the flame turns lilac?
Potassium
42
What Cation is present if the flame turns brick red?
Calcium
43
What Cation is present if the flame turns light green?
Barium
44
What Cation is present if the flame turns blue/green?
Copper
45
What anion was present if the halide test turns white?
Chloride
46
What anion was present if the halide test turns cream?
Bromide
47
What anion was present if the halide test turns yellow?
Iodide.
48
Which cation was present if damp red litmus paper turns blue?
Ammonium (NH4+)
49
What is the basic method to test for nitrate?
1. Add NaOH to the compound 2. Add Al Powder and heat 3. Place damp red litmus in gas 4. Observe color of litmus paper
50
What is the positive result for the nitrate test?
Damp red litmus turns blue
51
Why does damp red litmus turn blue when exposed to nitrate compounds?
Nitrate compounds are bases. This means that the indicator on the litmus goes from red (acid) --> blue (base)
52
What is the basic method for the NaOH/NH3 tests (on other compounds)?
1. dissolve sample in water 2. add drops of NaOH / NH3 and observe precipitate 3. Add excess drops of NH3 / NaOH and observe precipitate
53
Interpret these results for the NaOH and NH3 tests: NaOH: colorless (aq) Excess NaOH: colorless (aq) NH3: colorless (aq) Excess NH3: colorless (aq)
group 1 compound
54
Interpret these results for the NaOH and NH3 tests: NaOH: white (s) Excess NaOH: white (s) NH3: white (s) Excess NH3: white (s)
group 2 compound
55
Interpret these results for the NaOH and NH3 tests: NaOH: green (s) --time-> orange (s) Excess NaOH: green (s) NH3: green (s) Excess NH3: green (s)
Fe2+ compound
56
Interpret these results for the NaOH and NH3 tests: NaOH: orange/brown (s) Excess NaOH: orange/brown (s) NH3: orange/brown (s) Excess NH3: orange/brown (s)
Fe3+ compound
57
Interpret these results for the NaOH and NH3 tests: NaOH: blue (s) Excess NaOH: blue (aq). Redissolves NH3: dark blue and white (s) Excess NH3: dark blue (aq). Redissolves
Cu2+ compound
58
Interpret these results for the NaOH and NH3 tests: NaOH: green/grey (s) Excess NaOH: green/grey (s) NH3: green/grey (s) Excess NH3: green/grey (s)
Cr3+ compound
59
Interpret these results for the NaOH and NH3 tests: NaOH: white (s) Excess NaOH: colorless (aq) NH3: white (s) Excess NH3: colorless (aq)
Zn2+ compound
60
Interpret these results for the NaOH and NH3 tests: NaOH: faint white (s) Excess NaOH: colorless (aq) NH3: faint white (s) Excess NH3: faint white (s)
Al3+ compound

IGCSE Chemistry (23 decks)

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