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Chemistry > Hydrocarbons > Flashcards

Hydrocarbons Flashcards

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1
Q

say order of all hydrocarbon things

A

meth
eth
prop
but

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2
Q

Why are alkanes saturated?

A

Contain no C=C double bonds

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3
Q

Formula of alkanes and alkenes

A

Alkanes: CnH2n+2
Alkenes: CnH2n

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4
Q

why are alkenes unsaturated?

A

contain one or more C=C double bonds

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5
Q

Test for alkanes and alkenes?

A
  • Add to bromine water
  • If it is an alkene it will change the water from orange to colourless
  • bromine + ethene –> 1,2-dibromoethane
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6
Q

combustion formula of alkanes and alkenes

A

alkane/alkene + oxygen gas –> carbon dioxide + water

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7
Q

How to do fermentation

A
  • Mix yeast and a solution of carbohydrate between 30 and 40 degrees
  • Have little oxygen because oxygen converts ethanol into ethanoic acid, which is not required
  • When concentration reaches 10% to 20%, the reaction stops because the ethanol kills the yeast
  • The yeast falls to the bottom and you can collect ethanol.
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Chemistry (9 decks)

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