The Earth And Atmosphere

Question 1

Before living things existed explain how the formation of oceans reduced the amount of carbon dioxide in the atmosphere

Answer 1

Carbon dioxide dissolved in the oceans
Carbonates we’re precipitated
Producing sediments and sedimentary rock

Question 2

Explain how greenhouse gases increase the Earths Average temperature

Answer 2

Short wave radiation is transmitted from the sun
It’s absorbed and re radiated - as long wave radiation
It’s absorbed by greenhouse gases

Question 3

Carbon monoxide is an atmospheric pollutant. Explain its source

Answer 3

Incomplete combustion of a fuel

Question 4

Explain how coal is formed

Answer 4

Ancient plants died and were covered in sediments
Led to high temperature and pressure over millions of years

Question 5

Name four substances that are long term stores of carbon which originated as carbon dioxide in the atmosphere

Answer 5

Sedimentary rock , coal , oil and natural gas

Question 6

Why does some short wave radiation reflect back to space but some pass through easily?

Answer 6

Because short wave radiation doesn’t interact strongly with gas molecules

Question 7

Carbon footprint

Answer 7

The total amount of carbon dioxide and other greenhouse gases emitted over the full life cycle of a product , service and event

Question 8

Test for hydrogen

Answer 8

Insert a lit splint at the end of the test tube with hydrogen , you’ll get a squeaky pop

Question 9

Test for Oxygen

Answer 9

If you insert a glowing splint inside a test tube with oxygen , the splint relights

Question 10

Test for carbon dioxide

Answer 10

Bubble the carbon dioxide through an aqueous solution of calcium hydroxide ( limewater ) using a Pipette , limewater will turn cloudy

Question 11

Test for chlorine

Answer 11

Insert damp litmus paper in the mouth of the test tube with chlorine , it will bleach the litmus paper , turning it white