Brainscape's Knowledge GenomeTM

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


See full index

A Level chemistry Y12 > 3.3.3. Alkenes > Flashcards

3.3.3. Alkenes Flashcards

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

What is an alkene?

A

A hydrocarbon with a carbon-carbon double bond

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

Why are alkenes described as unsaturated?

A

They have a carbon-carbon double bond

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

Describe the electron density of the double bond

A

It is a region of high electron density

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

What type of stereoisomerism can alkenes exhibit?

A

E-Z isomerism

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

What physical feature of alkenes causes their stereoisomerism?

A

That the double bond cannot rotate

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

What two type of reactions do alkenes typically undergo?

A

Electrophilic addition or polymerisation

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

What type of reagents do alkenes react with?

A

Electrophiles

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

Which three reagents do alkenes typically react with in an electrophilic addition reaction?

A

HBr, H?SO? and Br?

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

What are the products of an electrophilic addition reaction with Br??

A

A dibromoalkane

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

Why is bromine water used as a test for alkenes?

A

The Br? reacts with the alkene so its reddish-brown colour is decolourised

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

What are the products of an addition reaction with HBr?

A

A bromoalkane

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

What is a carbocation intermediate?

A

An intermediate molecule in a reaction which has a positive charge on a carbon atom

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

Place the orders of carbocation in order of stability from most to least

A

Tertiary > secondary > primary

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

What is the name of the effect that stabilises carbocations?

A

Alkyl inductive effect

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

Which carbocation forms the major product in an addition reaction with HBr?

A

More stable carbocation

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

What is the product of a reaction with an alkene and concentrated H?SO??

A

Alkyl hydrogensulfate

17
Q

The alkyl hydrogensulfate then reacts with water to form what product?

A

Alcohol

18
Q

Why can sulphuric acid be considered a catalyst in hydration of alkenes?

A

It is regenerated

19
Q

What are addition polymers formed from?

A

Alkenes and substituted alkenes

20
Q

How are addition polymers named?

A

Poly(name of original alkene)

21
Q

What are the chemical properties of addition polymers?

A

Generally unreactive

22
Q

Why are addition polymers unreactive?

A

Strong C-C and C-H bonds

23
Q

What is PVC?

A

Poly(chloroethene)

24
Q

What is a plasticiser?

A

A small molecule that can get inbetween polymer chains resulting in them being able to slide over one another more easily

A Level chemistry Y12 (8 decks)

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