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Chemistry > Using Resources > Flashcards

Using Resources Flashcards

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1
Q

What do humans use earths resources for ?

A

Warmth
Shelter
Food
Transport

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2
Q

What do we use natural resources supplemented by agriculture for ?

A

Food
Timber
Clothing
Fuels

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3
Q

What is sustainable development?

A

Development that meets the needs of current generations without compromising the ability of future generations to meet their own needs

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4
Q

What is a finite resource ?

A

One that will run out e.g. coal

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5
Q

For humans, what should drinking water have ?

A

Sufficiently low levels of dissolved salts and microbes

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6
Q

What is water that is safe to drink called ?

A

Potable water ( ground water )

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7
Q

How is most potable water produced ?

A

Choosing an appropriate source of fresh water

Passing the water through filter beds

Sterilising

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8
Q

What are the 3 sterilising agents used for potable water ?

A

Chlorine
Ozone
Ultraviolet light

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9
Q

If supplies of fresh water are limited what has to be done ?

A

Desalination of salty water or sea water

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10
Q

How can desalination be done ?

A

Distillation

Reverse of osmosis using membranes

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11
Q

What is an issue with desalination ?

A

It requires large amounts of energy

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12
Q

What is pure water ?

A

Natural fresh water

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13
Q

What 2 things cause large amounts of waste water ?

A

Urban lifestyles
Industrial processes

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14
Q

What does sewage, agricultural and industrial waste water require ?

A

Removal of organic matter and harmful microbes

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15
Q

What is the method for treating sewage ?

A
  1. Screening and grit removal
  2. Sedimentation to produce sewage sludge and effluent
  3. Anaerobic digester of sewage sludge
  4. Aerobic biological treatment of effluent
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16
Q

What part of earths resources are limited ?

A

Metal ores

17
Q

What are 2 new ways of extracting copper from low-grade ores ?

A

Phytomining

Bioleaching

18
Q

What is phytomining ?

A

Using plants to absorb metal compounds

The plants are harvested then burned to produce ash that contains metal compounds

19
Q

What is bioleaching ?

A

Using bacteria to produce leachate solutions that contain metal compounds

20
Q

Why are life cycle assessments performed?

A

To assess the environmental impact of products

21
Q

In LCAs what do they assess about the product ?

A

Extracting and processing raw materials

Manufacturing and packaging

Use and operation during its lifetime

Disposal at the end of its useful life, including transport and distribution at each stage

22
Q

What are two ways we can reduce the use of resources?

A

Reuse
recycling

23
Q

How can glass be reused ?

A

Melted and made into a different product

Chemistry (7 decks)

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