Chapter 25 - Fuel

Question 1

What three conditions do you need to make fire happen?

Answer 1

You need fuel, oxygen and heat

Question 2

What are fossil fuels?

Answer 2

Fossil fuels formed from the remains of organisms that lived millions of years ago

Question 3

What are the two main elements of fossil fuels?

Answer 3

➡️ Hydrogen

➡️ Carbon

Question 4

What do you call compounds that are mainly made of hydrogen and carbon?

Answer 4

Hydrocarbons

Question 5

What is produced when hydrocarbons are burned?

Answer 5

When hydrocarbons are burned, carbon dioxide is and water vapour

Question 6

Explain the greenhouse effect

Answer 6

Greenhouse gases such as methane and carbon dioxide trap heat from the sun causing the earth to heat up

Question 7

What is sulfuric acid and where does it come from?

Answer 7

Many fossil fuels, especially coal, contain sulfur. When burned, they release sulfur dioxide. This dissolves in rainwater forming sulfuric acid which is strong

Question 8

What is nitric acid and where does it come from?

Answer 8

Car exhausts emit oxides of nitrogen which mixes with rain water to form nitric acid which has a low pH

Question 9

What is fuel?

Answer 9

Fuel is a substance that burns in oxygen to produce heat