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C1 > Burning Fuels > Flashcards

Burning Fuels Flashcards

1
Q

What happens when there’s plenty of oxygen about?

A

Hydrocarbons burn to produce only carbon dioxide and water

Hydrocarbon + oxygen –> carbon dioxide + water (+energy)

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2
Q

What has happened to the hydrogen and carbon in the hydrocarbon in this reaction?

Hydrocarbon + oxygen –> carbon dioxide + water (+energy)

A

Have both been oxidised

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3
Q

What does complete combustion release?

A

Lots of energy and only produces those two harmless waste products.

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4
Q

When there’s plenty of oxygen, what colour flame does the gas burn with?

A

A clear blue flame

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5
Q

How do you test for CO2?

A

Bubbling gas through limewater. It turns limewater milky

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6
Q

If there isn’t enough oxygen, what will happen?

A

The combustion will be incomplete

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7
Q

Is incomplete combustion safe?

A

NO!

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8
Q

What is produced by incomplete combustion?

A

Carbon dioxide and water are still produced, but you can also get carbon monoxide and carbon

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9
Q

What sort of flame does incomplete combustion mean?

A

A smoky yellow flame

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10
Q

Does incomplete combustion produce more or less energy than complete combustion?

A

Less energy

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11
Q

What is carbon monoxide like?

A

Colourless, odourless and very toxic gas

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12
Q

How are people killed every year due to incomplete combustion?

A

Every year people are killed while they sleep

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13
Q

When does complete combustion happen?

A

When there’s plenty of oxygen

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14
Q

State equation for complete combustion

A

Hydrocarbon + Oxygen –> Carbon Dioxide + Water

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15
Q

State equation for incomplete combustion

A

Hydrocarbon + Oxygen –> Carbon + Carbon Monoxide + Carbon Dioxide + Water

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16
Q

What should you do to avoid incomplete combustion and having a faulty gas fire or boiler?

A

Regularly service gas appliances

17
Q

What is a clue that the fuel is not burning fully and producing incomplete combustion?

A

The black carbon usually given off produces sooty marks

18
Q

What do you want when you’re burning a fuel for it to be safe?

A

Lot’s of oxygen

19
Q

What should you consider when choosing the best fuel?

A

Ease of Ignition
Energy Value
Ash and Smoke
Storage and Transport

C1 (25 decks)

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