Using carbon fuels

Question 1

What different characteristics should be considered when choosing a fuel?

Answer 1

>energy value
>ease of use
>cost
>pollution caused
>availability
>storage method
>toxicity

Question 2

What is the word equation for burning fuel in air?

Answer 2

fuel + oxygen > carbon dioxide + water

Question 3

What are the two word equations for incomplete combustion?

Answer 3

• fuel + oxygen > carbon monoxide + water

- fuel + oxygen > carbon + water

Question 4

When does incomplete combustion happen?

Answer 4

When there is not enough oxygen

Question 5

What is given off when fuels burn in a shortage of oxygen?

Answer 5

soot and unwanted toxic gases (e.g. carbon monoxide)

Question 6

What does the blue flame on a Bunsen burner mean?

Answer 6

The combustion is complete as the hole is open so there is plenty of oxygen.
-more energy released

Question 7

What does the yellow flame on a Bunsen burner mean?

Answer 7

• Incomplete combustion
• Hole closed
• Lack of oxygen
• Less energy transferred

Question 8

What are the advantages of complete combustion?

Answer 8

• More energy released

- No toxic gases or soot produced

Question 9

How can burning fuels cause pollution problems?

Answer 9

Fossil fuels:

• contribute to greenhouse effect
• produces Co2
• contribute to global warming

Coal:

• has sulfur in it
• burning it gives off sulfur dioxide
• dissolves to make acid rain
• damages buildings, statues and kills fish & trees

Question 10

What is the symbol equation for complete combustion?

Answer 10

CH4 + O2 > CO2 + H2O