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Chemistry > C9 Crude Oils And Fuels > Flashcards

C9 Crude Oils And Fuels Flashcards

1
Q

What are alkanes

A

Homologous series of saturated hydrocarbons with the general formula CnH2n+2

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2
Q

Molecular formula of methane

A

CH4

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3
Q

Molecular formula of ethane

A

C2H6

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4
Q

Molecular formula of propane

A

C3H8

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5
Q

Molecular formula of butane

A

C4H10

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6
Q

What is a crude oil

A

A mixture of many different compounds

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7
Q

Why is crude oil not a very useful as a product itself

A

It has too many substances in it

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8
Q

What is flammability

A

How easily something sets on fire

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9
Q

What is viscosity

A

How easily it flows

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10
Q

What is fractional distillation

A

Crude oil seperated into useful fractions depending on the boiling point of the numerous substances it contains it goes from high temperatures and lowers as you go up

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11
Q

How does fractional distillation work

A

Crude oil is heated in a furnace and passed into the bottom of the fractionating column. The vapour mixture given off rises up the column and the different fractions condense out at different parts of the column

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12
Q

What is volatility

A

The tendency to turn into a gas

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13
Q

What is combustion

A

An oxidation chemical reaction where energy is released from fuels

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14
Q

What is produced when hydrocarbon fuels react with oxygen

A

Carbon dioxide and water.

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15
Q

What happens when there is a positive test for water in combustion

A

Blue cobalt chloride paper turns PINK also turns white anhydrous (dry) Copper sulfate BLUE

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16
Q

What happens when there is a positive test for carbon dioxide in combustion

A

Bubble it through limewater. Limewater turns cloudy

17
Q

What is cracking reaction an example of

A

Thermal decomposition

18
Q

Formula for alkenes

A

CnHn2

19
Q

What does cracking do

A

Allows large hydrocarbon molecules to be broken down into smaller, more useful hydrocarbon molecules.

20
Q

What is cracking an example of

A

Thermal decomposition reaction

21
Q

What is a positive test result in the cracking experiment for alkenes

A

It turns the orange bromine water colourless

Chemistry (4 decks)

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