Brainscape's Knowledge GenomeTM

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


See full index

Chemistry synoptic revision 2023 > tests > Flashcards

tests Flashcards

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

How do you test for an alkene?

A

Bromine water

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

What is observed when an alkene is added to bromine water?

A

The Bromine water changes from orange to colourless.

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

Why does an alkene decolourise bromine water?

A

It reacts by electrophilic addition

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

What does sodium carbonate test for?

A

Acids

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

What is observed when sodium carbonate is added to an acid?

A

Effervescence (CO2 gas is released)

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

What is observed when acidified potassium dichromate is added to a primary alcohol?

A

The dichromate is reduced changing from orange to green

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

What is observed when acidified potassium dichromate is added to a secondary alcohol?

A

The dichromate is reduced changing from orange to green

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

What is observed when acidified potassium dichromate is added to an aldehyde?

A

The dichromate is reduced changing from orange to green

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

What is observed when acidified potassium dichromate is added to a tertiary alcohol?

A

No change (tertiary alcohols can not be oxidised)

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

What is observed when acidified potassium dichromate is added to a ketone?

A

No change (ketones can not be oxidised by potassium dichromate)

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

What is observed when acidified potassium dichromate is added to a carboxylic acid?

A

No change (carboxylic acids can not be oxidised by potassium dichromate)

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

Tollen’s reagent is a test for which functional group?

A

Aldehyde

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

What is observed when Tollen’s reagent is added to an aldehyde?

A

A silver mirror forms

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

What happens to an aldehyde when it is tested using Tollen’s reagent?

A

the aldehyde is oxidised to a carboxylic acid

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

What is observed when Tollen’s reagent is added to a ketone?

A

No visible change

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

What reagent is used to test for ammounium ions?

A

Heat with NaOH

16
Q

What is observed when ammounium (NH4+) ions are heated with NaOH

A

Gas released turns red litmus paper blue

17
Q

What gas is released when ammonium ions are warmed with NaOH

A

ammonia gas (NH3)

18
Q

What is Fehlings solution a test for?

A

Aldehydes

19
Q

What is observed when an aldehyde reacts with Fehling’s solution?

A

Brick red precipitate

20
Q

How do you test for a haloalkane

A

Add NaOH and warm to substitute the halide ion
Acidify with NHO3
Add AgNO3
Once a ppt is formed add dilute ammonia
Then add conc ammonia

21
Q

What are the results for the haloalkane test

A

A white,cream, yellow ppt will form of AgCl,AgBr or AgI
On addition of ammonia, AgCl will dissolve
With conc ammonia- AgBr will dissolve but AgI ppt will remain

22
Q

Test for hydrogen gas and result

A

Apply a lit splint
A squeaky pop

23
Q

Test for CO2 gas

A

Bubbler through lime water- solution goes cloudy

24
Q

Test for O2

A

Apply a glowing splint
The splint will re-light

25
Q

Test for SO42- ions and result

A

BaCL2, white ppt forms

26
Q

Halide ions test and result

A

Add HNO3 then AgNO3
White ppt- Cl- ions are present which will dissolve in dilute ammonia
Cream- Br- ions are present which will dissolve in conc ammonia
Yellow- I- present which are insoluble in ammonia

27
Q

test for CO32- and result

A

Add any acid- effervescence

Chemistry synoptic revision 2023 (16 decks)

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