Alkenes Flashcards

1
Q

What forces do alkenes experience

A

They are non polar so they only experience Van der waal forces

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2
Q

Are alkenes soluble in water?

A

No they are highly insoluble in water

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3
Q

The larger the chain of the alkene, the ____ the van der waal forces

A

Stronger due to more electrons so stronger VDW forces.

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4
Q

Can double bonds rotate?

A

No they have restricted bond rotations.

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5
Q

What are stereoisomers?

A

the same structural formula but the atoms have different spacial arrangement.

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6
Q

What is a substituent?

A

Anything bonded to a double carbon-carbon bond that isn’t a H

Eg. F, CH3

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7
Q

When the substituents are on the same side what are they called?

A

Z isomer

ZE ZAME SIDE

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8
Q

When the substituents are on different sides what do we call them?

A

E isomers

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9
Q

When a molecule has three substituents what procedure do we use?

A

CIP
Compare the atomic numbers of the substituents. And if they are on the same side Z and different E

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10
Q

Which carbocations are more stable:
Primary, secondary or tertiary

A

Tertiary are the most and then secondary

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11
Q

Test for alkenes:

A

Bromine water

If double bond present—-> goes from orange to colourless.

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12
Q

what are the two types of polymerisation?

A

addition polymerisation
(year 12)

condensation polymerisation
(year 13)

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13
Q

how do you name a polymer?

A

add poly(alkene)
eg. ethene—> poly(ethene)

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14
Q

why are polymers unreactive?

A

the strong c-c bond which are on polar do not corrode so cannot be broken down

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15
Q

what type of forces do polymers generally have?

A

van der waals forces.

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16
Q

what do polymers exist as in room temperature?

A

solids

17
Q

what is PVC?

A

poly(cholorethene)

18
Q

why are PVC so rigid?

A

as the they have dipole-dipole forces and van der waals forces

19
Q

how do chemist make PVC flexible?

A

They add a chemical known as a plasticiser which separated the bonds to make it flexible.