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GCSE - Revision. > GCSE Chemistry > Flashcards

GCSE Chemistry Flashcards

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1
Q

What is cracking an example of

A

Thermal decomposition

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2
Q

What is combustion

A

Combustion is an oxidation chemical reaction where energy is released from fuels.

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3
Q

What is the process called when the chemicals in crude oil are separated into useful fractions

A

Fractional Distillation

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4
Q

What is viscosity

A

The lack of fluidity a substance has

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5
Q

Compounds that contain only carbon and hydrogen atoms are called

A

Hydrocarbons

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6
Q

What is a mixture

A

A mixture consists of two or more elements or compounds that are not chemically bonded together.

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7
Q

What is crude oil

A

A mixture of hydrocarbons

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8
Q

Crude oil is a thick, smelly dark brown liquid. Before it can be used it must be separated into ___________.

A

Fractions

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9
Q

Distillation can be used to separate a pure liquid from a mixture of liquids with different ___________.

A

Boiling points

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10
Q

Different hydrocarbons in crude oil have different boiling points, so they can be separated by fractional ___________.

A

Distillation

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11
Q

The fractioning column is ________ at the bottom and __________ at the top.

A

Hot/cool

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12
Q

Small hydrocarbons with only a few carbon atoms have _________ boiling points.

A

Low

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13
Q

_______________ hydrocarbons containing __________ carbon atoms have high boiling points.

A

Large/many

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14
Q

_________ hydrocarbons travel further up the fractionating column before they condense because they have _______ boiling points.

A

Smaller/lower

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15
Q

Substances with _____ boiling points condense near the bottom of the fractionating column.

A

High

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16
Q

Bigger hydrocarbon molecules are _______ viscous than small molecules.

A

More

17
Q

Bigger hydrocarbon molecules are _______ volatile than small molecules.

A

Less

18
Q

Bigger hydrocarbon molecules are _______ flammable than small molecules.

A

Less

19
Q

Why can shorter-carbon fractions evaporate much more easily than longer ones

A

Lower boiling point

20
Q

What do the weak bonds (intermolecular forces) between the molecules have to be for the hydrocarbon to boil

A

They have to be broken

21
Q

How many carbon atoms in methane

A

1

22
Q

How many carbon atoms in ethane

A

2

23
Q

How many carbon atoms in propane

A

3

24
Q

How many carbon atoms in butane

A

4

25
Q

Where is crude oil found

A

In rocks

GCSE - Revision. (7 decks)

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