Brainscape's Knowledge GenomeTM

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


See full index

Chemistry > Chemical testing paper 2 > Flashcards

Chemical testing paper 2 Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards
1
Q

test for hydrogen gas

A

Test: use a lit splint
Result: burns with a squeaky pop

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

test for carbon dioxide

A

Test: bubble through limewater
Result: limewater turns cloud

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

test for oxygen

A

Use a glowing splint

Glowing splint relights

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

test for ammonia gas

A

Use red litmus paper

Turns damp red litmus paper blue

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

test for chlorine gas

A

Use moist litmus paper

Turns moist litmus paper white (bleaches)

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

how to carry out a flame test

A

A platinum or nichrome wire is dipped into concentrated hydrochloric acid to remove any impurities.
The wire is dipped into the salt being tested so some salt sticks to the end.
The wire and salt are held in a roaring bunsen burner flame.
The colour is observed.

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

lithium flame colour

A

red

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

sodium flame colour

A

yellow

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

potassium flame colour

A

lilac

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

calcium flame colour

A

Orange- red

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

copper II flame colour

A

blue - green

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

Tests for NH4 + (ammonium)

A

add sodium hydroxide solution and warm

damp red litmus paper will turn blue ( ammonia gas)

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

Tests for Cu2+, Fe2+ and Fe3+

A

Add sodium hydroxide and observe the colour

blue precipitate of copper hydroxide
green precipitate of iron II hydroxide
brown precipitate of iron III hydroxide

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

Tests for anions Cl–, Br– and I–

A

Add nitric acid to remove impurities
Add silver nitrate solution

Chloride - white precipitate
Bromide - cream precipitate
Iodide - yellow precipitate

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

Tests for sulfate anions SO4 2–

A

Add hydrochloric acid to remove impurities
Add barium chloride solution
White precipitate should form if sulfate ions are present

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

Tests for carbonate ions CO3 2-

A

Add hydrochloric acid

If carbonate ions are present, fizzing will occur

17
Q

Test for the presence of water using anhydrous copper(II) sulfate

A

Add anhydrous copper (II) sulfate (CuSO4) to a sample.

If water is present the anhydrous copper (II) sulfate will change from white to blue.

18
Q

Physical test to show whether a sample of water is pure

A

If the sample is pure water it will boil at 100oC

Chemistry (15 decks)

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