7.5 Gases In The Atmosphere

Question 0

How did the CO2 used up by plants get into animal remains?

Answer 0

The CO2 used up by plants ended up in animal remains because the animals ate the plants, which were full of CO2.

Question 1

What took up most of the CO2 in the Earth’s early atmosphere?

Answer 1

The thing that took up the most CO2 in the Earth’s early atmosphere was plants.

Question 2

In what form could these plant and animal remains containing CO2 be found?

Answer 2

These plant and animal remains containing CO2 could be found in sedimentary rocks and fossil fuels.

Question 3

How was limestone formed?

Answer 3

Limestone was formed from the shells and skeletons of marine animals.

Question 4

What was formed from the shells and skeletons of marine animals

Answer 4

Limestone was formed from the shells and skeletons of marine animals.

Question 5

What was a key role of plants in the Earth’s early atmosphere?

Answer 5

A key role of plants in the earth’s early atmosphere was that they used up much of the CO2.

Question 6

What was a key role of animals on the earth?

Answer 6

A key role of animals on the earth was that they ate the plants, which contained lots of CO2.

Question 7

What is important about animal remains such as sedimentary rocks and fossil fuels?

Answer 7

The important thing about animal remains such as sedimentary rocks and fossil fuels is that they contain CO2, because of the plants that the animals had eaten.

Question 8

What important things do fossil fuels contain?

Answer 8

The important things that fossil fuels contain are carbon and hydrogen, which come from plants and animals.

Question 9

Where can carbon and hydrogen be found in natural remains?

Answer 9

Carbon and hydrogen can be found in natural remains such as fossil fuels.

Question 10

What important substance was formed from the shells and skeletons of marine animals?

Answer 10

The important substance that was formed from the shells and skeletons of marine animals was limestone.

Question 11

How similar were the gases in the earth’s atmosphere 200 million years ago compared to today?

Answer 11

By 200 million years ago, the proportions of gases in the earth’s atmosphere had STABILISED and were much the same as they are today.

Question 12

What fraction of the earth’s current atmosphere is nitrogen, and what fraction is oxygen?

Answer 12

Roughly 4/5 of the earth’s modern atmosphere is nitrogen and roughly 1/5 is oxygen.

Question 13

What important thing happened in the earth’s atmosphere 200 million years ago?

Answer 13

The important thing rant happened to the earth’s atmosphere 200 million years ago is that the gases in the atmosphere STABILISED, meaning that the gases in the atmosphere 200 million years ago are roughly the same as the gases in the earth’s atmosphere today.

Question 14

What do these fractions represent: 4/5 and 1/5?

Answer 14

These fractions represent the proportion of nitrogen to oxygen in the earth’s current atmosphere. Roughly 4/5 is nitrogen and roughly 1/5 is oxygen.

Question 15

What other gases make up roughly 1% of the earth’s current atmosphere?

Answer 15

The other gases that make up roughly 1% of the earth’s current atmosphere are; carbon dioxide, water vapour, and noble gases.

Question 16

How present are these gases in the earth’s current atmosphere; carbon dioxide, water vapour and noble gases?

Answer 16

These gases, carbon dioxide, water vapour and noble gases make up roughly 1% of the earth’s current atmosphere.

Question 17

In what way were the oceans important in the production of CO2 in sedimentary rocks?

Answer 17

The oceans were important in the production of CO2 in sedimentary rocks because CO2 DISSOLVES in oceans. It formed insoluble CARBONATE COMPOUNDS, that became sedimentary rocks?

Question 18

What formed insoluble CARBONATE COMPOUNDS that were deposited on the earth’s sea beds?

Answer 18

CO2 dissolved in the earth’s oceans and formed insoluble CARBONATE COMPOUNDS that were deposited on sea beds. These then formed sedimentary rocks?

Question 19

What substance directly formed sedimentary rocks?

Answer 19

The substance that directly formed sedimentary rocks was insoluble CARBONATE COMPOUNDS that were deposited on the earth’s sea beds.

Question 20

How can gases in the air be separated?

Answer 20

Gases in the air can be separated through fractional distillation.

Question 21

Very simply, how can gases in the air be separated using fractional distillation?

Answer 21

Gases in the air can be separated using fractional distillation because they all have different boiling points.

Question 22

What process utilises the fact that gases have different boiling points?

Answer 22

Fractional distillation utilises the fact that gases have different boiling points.

Question 23

On an industrial level, what is fractional distillation used for?

Answer 23

On an industrial leval, fractional distillation is used for extracting pure nitrogen and oxygen from LIQUID air.

Question 24

What temperature is air cooled to during fractional distillation?

Answer 24

During fractional distillation, air is cooled to -200 degrees C.

Question 25

What is important about this figure; -200 degrees C?

Answer 25

This figure, -200 degrees C is the temperature that air is cooled to during fractional distillation.

Question 26

What is air fed into during fractional distillation?

Answer 26

During fractional distillation air is fed into a fractional distillation COLUMN.

Question 27

What is fed into a fractional distillation COLUMN?

Answer 27

Air is fed into a fractional distillation COLUMN.

Question 28

Which two other gases is nitrogen separated from?

Answer 28

NITROGEN is separated from OXYGEN//ARGON

Question 29

How is pure oxygen and argon produced?

Answer 29

Pure OXYGEN//ARGON is produced by further distilling air.