Brainscape's Knowledge GenomeTM

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


See full index

Alevel - Chemistry > Required Practical 4 > Flashcards

Required Practical 4 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 1
G2 metal cations (with NaOH)

A

BaCl2
CaBr2
MgCl2
SrCl2

Add sodium hydroxide solution, record result then add sodium hydroxide solution in excess and record the result.

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

Test 1
BaBr2 + sodium hydroxide solution

A

BaBr2 (aq) + 2NaOH (aq) —> Ba(OH)2 (aq) +2NaBr (aq)

NaOH - colourless solution
Excess NaOH - colourless solution

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

Test 1
CaCl2 + sodium hydroxide solution

A

CaCl2 (aq) + 2NaOH (aq) —> Ca(OH)2 (s) +2NaCl (aq)

Ca(OH)2 - slightly soluble

NaOH -slight - slight white precipitate
Excess NaOH - slight white precipitate

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

Test 1
MgCl2 + sodium hydroxide solution

A

MgCl2 (aq) + 2NaOH (aq) —> Mg(OH)2 (s) +2NaCl (aq)

NaOH - white precipitate
Excess NaOH - white precipitate

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

Test 1
SrCl2 + sodium hydroxide solution

A

SrCl2 (aq) + 2NaOH (aq) —> Sr(OH)2 (aq) +2NaCl (aq)

NaOH - slight white precipitate
Excess NaOH - colourless solution

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

Test 2
G2 metal cations (with H2SO4)

A

BaCl2
CaBr2
MgCl2
SrCl2

Add 1 drop of sulphuric acid, record result then add 5 drops sulphuric acid and record the result.

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

Test 2
BaCl2 + sulphuric acid

A

BaCl2 (aq) + H2SO4 (aq) —> BaSO4(s) + 2HCl(aq)

1 drop H2SO4 - white precipitate
5 Drops H2SO4 - white precipitate

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

Test 2
CaBr2 + sulphuric acid

A

CaBr2 (aq) + H2SO4 (aq) —> CaSO4(aq) + 2HBr(aq)

1 drop H2SO4 - slight white precipitate
5 Drops H2SO4 - colourless solution

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

Test 2
MgCl2 + sulphuric acid

A

MgCl2 (aq) + H2SO4 (aq) —> MgSO4(aq) + 2HCl(aq)

1 drop H2SO4 - colourless solution
5 Drops H2SO4 - colourless solution

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

Test 2
SrCl2 + sulphuric acid

A

SrCl2 (aq) + H2SO4 (aq) —> SrSO4(s) + 2HCl(aq)

SrSO4 - slightly soluble

1 drop H2SO4 - slight white precipitate
5 Drops H2SO4 - slight white precipitate

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

Test 3
Ammonium ions (from NH4Cl)

A

NH4Cl - ammonium chloride

Add sodium hydroxide solution, observe.

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

Test 3
ammonium chloride + sodium hydroxide solution

A

NH4Cl(aq) + NaOH(aq) —> NH3(g) + H2O(l) + NaCl(aq)

Litmus paper turns red to blue
(Effervescence from NH3 gas)

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

Test 4
Anions in aqueous solution (ammonia solution)

A

Ammonia solution + damp red litmus paper will turn blue.

The ammonia solution reacts with the water on the litmus paper to produce ammonia hydroxide which is alkaline.

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

Test 4
Water + ammonia

A

H2O(l) + NH3(aq) —> NH4+ (g) + OH- (aq-)

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

Test 5
Carbonate ions in aqueous solution

A

Add sodium Hydroxide solutions and dilute hydrochloric acid.

Positive result - white precipitate

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

Test 5
Calcium carbonate + Sodium hydroxide solution

A

CaCO3(aq) + NaOH(aq) + 2HCl(aq) —> NaHCO3(s) + CaCl2(aq) + H2O(l)

17
Q

Test 6
Sulphate ions in aqueous solution

A

Add dilute hydrochloric acid (remove impurities) and barium chloride.

Positive result - white precipitate

18
Q

Test 6
Magnesium sulphate + barium chloride + dilute hydrochloric acid

A

MgSO4(aq) + BaCl2(aq) —> BaSO4(s) + MgCl2 (aq)

19
Q

Test 7a
Halide ions in aqueous solution (with nitric acid and silver nitrate)

A

Add nitric acid, record observations then add 1 drop of silver nitrate solution and record the observations.

20
Q

Test 7a
Halide ions in aqueous solution (with nitric acid observations)

A

Nitric acid - all remain colourless solutions

KCl = Cl-(aq) + Ag+(aq) —> AgCl(s)

21
Q

Test 7a
KCL in aqueous solution (with nitric acid and silver nitrate observations and equations)

A

KCl = Cl-(aq) + Ag+(aq) —> AgCl(s)
White precipitate

22
Q

Test 7a
KBr in aqueous solution (with nitric acid and silver nitrate observations and equations)

A

KBR = Br-(aq) + Ag+(aq) —> AgBr(s)
Cream precipitate

23
Q

Test 7a
KI in aqueous solution (with nitric acid and silver nitrate observations and equations)

A

KI = I-(aq) + Ag+(aq) —> AgI(s)
Yellow precipitate

24
Q

Test 7b
Halide ions in aqueous solution (ammonia)

A

Add dilute ammonia, record observations
Add concentrated ammonia, record observations.

25
Q

Test 7b
AgCl in aqueous solution (+ dilute and concentrated ammonia)

A

Dilute - precipitate dissolves, colourless solution

Conc - precipitate dissolves, colourless solution

26
Q

Test 7b
AgBr in aqueous solution (+ dilute and concentrated ammonia)

A

Dilute - slight cream precipitate

Conc - precipitate dissolves, colourless solution

27
Q

Test 7b
AgI in aqueous solution (+ dilute and concentrated ammonia)

A

Dilute - yellow precipitate

Conc - yellow precipitate

28
Q

Test 8
Halide ions in solid salts

A

Add concentrated sulphuric acid + test with blue litmus paper turns red
(can be plain or dipped in acidified K2Cr2O7 or lead solution)

29
Q

Test 8
KCl in solid salts

A

Add Concentrated sulphuric acid + blue litmus paper.

Observation - green gas + Blue litmus paper turned red.

2KCl(aq) + 2H2SO4(aq) —> SO2(g) + Cl2(g) + K2SO4(aq) + 2H2O(aq)

30
Q

Test 8
KBr in solid salts

A

Concentrated sulphuric acid + blue litmus paper dipped in acidified potassium dichromate solution.

Observation - orange gas + Blue litmus paper turns red

2KBr(aq) + H2SO4(aq) —> SO2(g) + Br2(g) + K2SO4(aq) + 2H2O(aq)

31
Q

Test 8
KI in solid salts

A

Concentrated sulphuric acid + blue litmus paper dipped in lead nitrate solution.

Observation - purple gas and black solid + Blue litmus paper turns red

2KI(aq) + H2SO4(aq) —> SO2(g) + I2(s) + K2SO4(aq) + 2H2O(l)

Alevel - Chemistry (6 decks)

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