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Flashcards in Resources, chemical analysis Deck (27)
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1
Q

Give for uses of resources

A

To provide warmth, shelter, food and transport

2
Q

What are most resources produced by?

A

Agriculture (such as cotton)

3
Q

What does modern agriculture allow us to do?

A

grow enough cotton to fill the needs of the world

4
Q

What can trees be used for?

A

Timber or fuel (e.g. biofuels such as woodchips)

5
Q

What fuel do most power stations run on?

A

Biofuel

6
Q

What does agriculture help us do?

A

Use the earth’s resources more efficeintly

7
Q

Where does natural rubber come form?

A

The sap of a tree

8
Q

How is synthetic rubber produced?

A

From crude oil

9
Q

What percent of the rubber from the world is synthetic?

A

75%

10
Q

What does it mean for a natural resource to be finite

A

It can be replaced as quick as it is being used

11
Q

How many kilograms of fossil fuels do we burn everyday?

A

Thousands of kilograms

12
Q

Where are huge amounts of metal extracted from?

A

The earth’s crust

13
Q

Is wood renewable?

A

Yes

14
Q

Why should we make human activity sustainable?

A

So we can meet our needs without preventing future generations from meeting theirs

15
Q

Explain how chemistry plays a part in using the earth’s resources

A

Artificial fertilisers allow us to grow more food with the land available
. Chemistry also helps us to provide water which is safe to drink
.Processes such as phytomining and bioleaching help us to extract metals more efficiently

16
Q

What does drinking water have to contain?

A

Sufficiently low levels of dissolved salts such as sodium chloride

17
Q

What is the name for water that is save to drink?

A

Potable water

18
Q

Why is portable and pure water not the same?

A

Pure water in the chemical sense contains no dissolved substances where as portable does

19
Q

In the UK where do we get most of our portable water from?

A

Rain water

20
Q

Why do we use rain water as our portable water?

A

Cause it contains low levels of dissolved substances

21
Q

Where does rain waiter collect?

A

Aquifers ,lakes, rivers and reservoirs

22
Q

How do we produce potable water?

A

We choose a good source of fresh water e.g.
river,
we then pass the water through filter beds to remove seeds and suspended particles,
the water is then sterilised to kill microbes in UK we use chlorine to sterilise

23
Q

What can be used instead of chlorine to sterilise water?

A

ultraviolet light or ozone

24
Q

Explain why some countries may have to use desalination in order to access potable water?

A

They may not have access to sources of fresh water, and only to salty water

25
Q

What does desalination do?

A

Reduces the levels of dissolved minerals to a acceptable level for potable water

26
Q

Give ways to carry out desalination

A

Distillation

.Reverse osmosis(pass the water through membranes)

27
Q

What do reverse osmosis and distillation require

A

High amounts of energy hence they are expensive