Topic 9

Question 1

Describe the 3 phases of earths evolution of atmosphere

Answer 1

Phase 1-volcanoes gave of lots of carbion dioxide, nitrogen and water vapour as well as small amount of methane and ammonia
Phase 2-water vapour condensed to form oceans and then plants absorbed the CO2 and released oxygen
Phase 3-the oxygen built up to allow more complex life to form and got to what it is today-80% nitrogen and 20% oxygen

Question 2

What is carbon footprint

Answer 2

Carbon footprint is a measure of how much greenhouse gases something produces over its full life time

Question 3

What are some ways we can reduce carbon footprint

Answer 3

Switch to renewable sources
Higher tax on greenhouse gas emitters
Cap gas emmisions
Capture CO2 and put it back underground as oil wells

Question 4

Crude oil and coal are

Answer 4

Fossil fuels

Question 5

What happens when hydrocarbons are burned with enough oxygen

Answer 5

A complete combustion happens

Question 6

What happens when hydrocarbons are burned without enough oxygen

Answer 6

An incomplete combustion occurs-solid particles (particulates) of soot and carbon monoxide as well as dioxide is released into the air