Resources, chemical analysis Flashcards
Give for uses of resources
To provide warmth, shelter, food and transport
What are most resources produced by?
Agriculture (such as cotton)
What does modern agriculture allow us to do?
grow enough cotton to fill the needs of the world
What can trees be used for?
Timber or fuel (e.g. biofuels such as woodchips)
What fuel do most power stations run on?
Biofuel
What does agriculture help us do?
Use the earth’s resources more efficeintly
Where does natural rubber come form?
The sap of a tree
How is synthetic rubber produced?
From crude oil
What percent of the rubber from the world is synthetic?
75%
What does it mean for a natural resource to be finite
It can be replaced as quick as it is being used
How many kilograms of fossil fuels do we burn everyday?
Thousands of kilograms
Where are huge amounts of metal extracted from?
The earth’s crust
Is wood renewable?
Yes
Why should we make human activity sustainable?
So we can meet our needs without preventing future generations from meeting theirs
Explain how chemistry plays a part in using the earth’s resources
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
What does drinking water have to contain?
Sufficiently low levels of dissolved salts such as sodium chloride
What is the name for water that is save to drink?
Potable water
Why is portable and pure water not the same?
Pure water in the chemical sense contains no dissolved substances where as portable does
In the UK where do we get most of our portable water from?
Rain water
Why do we use rain water as our portable water?
Cause it contains low levels of dissolved substances
Where does rain waiter collect?
Aquifers ,lakes, rivers and reservoirs
How do we produce potable water?
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
What can be used instead of chlorine to sterilise water?
ultraviolet light or ozone
Explain why some countries may have to use desalination in order to access potable water?
They may not have access to sources of fresh water, and only to salty water
