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Chemistry > Fuels Test > Flashcards

Fuels Test Flashcards

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1
Q

What is a flammable substance?

A

A substance which combusts/burns easily

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2
Q

What is burning?

A

A reaction with oxygen which can also be called combustion.

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3
Q

What is Natural Gas?

A

Nearly all methane (the simplest hydrocarbon)

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4
Q

What are the three parts of the fire triangle?

A

Fuel, Heat and Oxygen

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5
Q

What is the general formula for an Alkene?

A

C H

n 2n

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6
Q

What are the three Fossil Fuels?

A

Natural Gas, Crude Oil and Coal

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7
Q

What is a fuel?

A

A chemical which burns and gives out heat energy.

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7
Q

What is a Hydrocarbon?

A

A compound of hydrogen and carbon only

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9
Q

What are the main gases in the air?

A

Oxygen, Carbon Dioxide, Nitrogen and Noble Gases

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10
Q

What is Incomplete Combustion?

A

This occurs when there isn’t enough isn’t enough oxygen

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11
Q

What happens when you place an Alkene in bromine water?

A

The bromine water will rapidly decolourise.

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12
Q

Are Alkanes saturated or unsaturated?

A

Saturated

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13
Q

What are the differences between long and short chain Alkanes?

A

Long chain Alkanes have higher boiling points than short chain Alkanes

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14
Q

When do oxides from?

A

During combustion reactions

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16
Q

What is the name given to a chemical reaction that gives out heat?

A

Exothermic

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16
Q

How is Crude Oil separated during Fractional Distillation?

A

Crude Oil is a mixture of many different Hydrocarbons, refining separates the crude oil into useful fractions by Fractional Distillation.
Instead of trying to separate each individual type of molecule, we just collect all the molecules that boil at a similar temperature.
Each fraction is a group of compounds with boiling points within the boiling range.

17
Q

How is Coal formed?

A

Trees died and fell into swamps, they then started to rot and form peat. The peat-like rotting vegetation was covered with mud and sand, this sealed it in and put it under pressure. The high pressures and temperatures over millions of years turned the rotting plant material into coal.

18
Q

What happens when you place an Alkane in bromine water?

A

The bromine water will not rapidly decolourise.

19
Q

What is the general formula for an Alkane?

A

C H

n 2n+2

20
Q

Are Alkenes saturated or unsaturated?

A

Unsaturated

21
Q

How is Crude Oil formed?

A

Crude Oil is formed from dead microscopic sea animals which have fell to the ocean bed, over time, layers of mud, sand and silt have formed over them.
High Pressure from the layers along with high temperatures has caused them to form oil.
THIS TAKES MILLIONS OF YEARS!

Chemistry (7 decks)

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