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Flashcards in Alkenes And Alkanes Deck (12)
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1
Q

What is the homologous group for alkanes?
What is the functional group?
What is the general formula?

A

Alkanes
None
C(n)h(2n+2)

2
Q

What is the HG for the alkenes?
What is the functional group?
Formula?

A

Alkenes
c=c double bond
C(n)h(2n)

3
Q

What are structural isomers?

A

Molecules with the same molecular formulae but different structural formulae
I.e butane and methyl-propane

4
Q

How do the melting and boiling points of branched chain alkanes differ?
Why?

A

Slightly lower melting and boiling points.

Shape means they don’t pack together well= weaker intermolecular forces

5
Q

What are the reactions of alkanes?

A
  1. Combustion with oxygen

2. substitution with chlorine and bromine-needs UV light

6
Q

Are the alkenes saturated or unsaturated?

A

They are unsaturated as they contain a c=c double bond

7
Q

Are alkenes more or less reactive than the alkanes?

A

More as they have a functional group

8
Q

What’re the reactions of the alkenes?

A
  1. Combustion - sooty flame(incomplete combustion) because higher proportion of carbon in the molecule
  2. Addition - the double bond breaks, allowing other atoms to join
9
Q

Propene + h2?

A

Propane(hydrogenated)

10
Q

What conditions are needed for the hydrogenation of propene?

A

150 degrees c

Nickel catalyst

11
Q

Ethene + water?

A
Ethanol ch3ch2(oh)
This is hydration
12
Q

What conditions are needed for hydration reactions?

A

300 degrees c
60 ATM
phosphoric acid