Earth's natural resources

Question 1

What are two things Earth’s natural resources do for us ? (Give examples for each )

Answer 1

Provide us with energy (crude oil , fossil fuels )

Provide us with resources (rocks, (building ) , metals

Question 2

What are Finite resources ? (Give examples )

Answer 2

Resources that will run out if we continue to use them (e,g fossil fuels )

Question 3

What are renewable resources ? (Give examples )

Answer 3

Resources that can be replaced as we use them (crops and biofuels )

Question 4

What are sustainable resources ?(Give examples )

Answer 4

Meeting the requirements of human needs

Question 5

Draw the water cycle

Answer 5

See chemistry book

Question 6

What is pure water

Answer 6

Only contains water and nothing else , no dissovled substances .

Question 7

What is potable water

Answer 7

Safe to drink , can contain dissolved substances

Question 8

What is the first step for making water from a reservoir potable ?

Answer 8

Water is passed through a special fitler made of fine sand and gravel , this removes any remaining particles or grit so the water is clean .

Question 9

What is the second step for making water from a reservoir potable ?

Answer 9

Water enters the water tretment works , passes through a screen with metal bars close together , to catch large objects such as twigs or leaves .

Question 10

What is the third step for making water from a reservoir potable ?

Answer 10

Goes through a settlement tank , where sand and soil settle out . Aluminium sulfate and lime are added to the water , so smapp particles of dirrt clump togeteher and sink to the botom of eater .

Question 11

What is the fourtht step for making water from a reservoir potable ?

Answer 11

A small amount of chlorine is added to the wter to killa ny bacteria in the water .

Question 12

What is the last step for making water from a reservoir potable ?

Answer 12

The ph of the water is checked and corrected so it is neutral , then stored in large tanks and reservoirs to be pumped out where needed .

Question 13

Three ways to kill microorganisms in water ?

Answer 13

Chlorine , ozone can be added , or a uv light could be used

Question 14

How can you test the water is pure >

Answer 14

You can test the boiling point of the water so it is 100degrees

Question 15

Name another process that can be used instead of distialltion ?

Answer 15

Reverse osmosis

Question 16

define desalination

Answer 16

Desalination is just removing slalt from water .

Question 17

A disadvanatge of distillation

Answer 17

Distillation reuqires large amount of energy to boil the water , making ot expensive

Question 18

How does reverse osmosis work ?

Answer 18

Reverse osmosis uses membranes to separate dissolved salts from salty water .

Question 19

Disadvanatge of reverse osmosis

Answer 19

Reverse osmosis uses energy to makehigh pressures neeeded , making it expensive .

Question 20

Why should bottled water in a supermkret not be described as pure water ?

Answer 20

As pure water does not contain dissolved substances ,whereas bottled water is potable water which does contain dissolved substances .