Polluting Gases (sulfur Dioxide And Carbon Dioxide)

Question 1

Sulfur dioxide

Answer 1

SO2
Sulfur= impurity in fossil fuels
When burnt, sulfur + oxygen -> sulfur dioxide
Sulfur dioxide reacts with water in atmosphere-> sulfuric acid-> acid rain
Sulfur can be removed from fuels BEFORE they are burned eg in vehicles or can be removed from waste gases after combustion eg in power stations

Question 2

Nitrogen oxides

Answer 2

The high temp in engines -> nitrogen and oxygen react together in the air, forming nitrogen oxide
Nitrogen oxides react with water and oxygen in the atmosphere to form nitric acid-> acid rain
Nitrogen oxides can cause breathing difficulties (asthmatics)

Question 3

Carbon dioxide

Answer 3

Green house gas -> collects in atmosphere + traps heat close to Earth’s surface

• > cause temperature on Earth to increase
• > climate change

Question 4

How to reduce carbon dioxide emissions?

Answer 4

Use alternative fuels eg hydrogen

Question 5

Hydrogen as a fuel

Answer 5

Hydrogen + oxygen -> water
Chemical reaction
Energy released used for propelling
Pros of hydrogen fuel cells: cleaner and more efficient , reduced green house gas emissions
Cons of hydrogen fuel cells: production methods of collecting hydrogen as yet still do cause emissions
Very expensive
Few garages to fill up with hydrogen

Question 6

Hoffman voltameter

Answer 6

Twice amount of hydrogen as oxygen
Why is this
2 atoms of hydrogen for every 1 atom of oxygen (H2O)