C-10 Finite and Renewable resources Flashcards
1
Q
What are natural resources
A
- Resources that form without human input
- Include anything that comes from earth, sea or air
- Can be replaced or improved upon by man made processes e.g rubber is replace by man made polymers
2
Q
- Wat are relabel reources
A
- Resources that reform at a similar rate of faster than we use then e.g timber
3
Q
- What i a non-renewable resource
A
- A finite resource that will run out
- E.g fossil fuels, metals
4
Q
- What happens after many finite resources are extracted
A
-They undergo man made processes e.g fractional distillation
5
Q
- What are the risks of extorting finite resources
A
- Social environmental and economic issues
- E.g metal oar scars landscape, destroys environment and habitats, needs lots of energy and produces lots of waste
6
Q
- What is sustainable development
A
- AN approach to development that takes into account of the needs of present society without damaging further generations
7
Q
- How can chemistry be improving sustainability
A
- Development allows for less need and lower amounts of energy to be used
e. g catalysts
8
Q
- What is the issue with copper
A
- Copper rich ores are in short supple
-
9
Q
hOw are scientists dealing with the lack of copper
A
- By extracting it from low grade ores- two methods
- Bioleaching- bacteria that converts copper compounds in ore to soluble copper compounds- separating. contain copper ions which are extracted by electrolysis
- Phytomining- Growing plants in soil that contains copper- can’t use so builds up on leaves- ash contains copper- electrolysis
10
Q
- Why is recycling metal important
A
- Mining and extorting takes lots of energy
- Recycling takes less and conserves finite amount of metal and cuts down on co2 producing waste
- Can be mixed to reduce separation needed
11
Q
- How can glass be recycled
A
- Reduces waste and need for new glass
- Some can’t be resumed so are recycled
- Separated by colour and chemical composition
- Brushed , melted and reshaped
12
Q
- What are the steps in a life cycle assent
A
- Getting raw materials- Extracting damage and process damage
- Manufacture and package- Energy use- waste produce used to package
- Using- e.g fertilisers damage the environment. How long it lasts for
- Product disposal- How it is disposed
13
Q
- What is a life cycle assessment
A
- Looks at every state of produce life and asses impaction environment
14
Q
- What are the life cycle asseuesnt for a plastic and paper bag
A
- Plastic
- Crude oil
- Fractional distillation- waste reduced due to other factions use
- CAn be reused
- Non biodegradable
15
Q
What are the issues with life cycle assessments
A
- Use of energy and waste can’t be easily quantified
- Not an object method and can e manipulated for supper
16
Q
- What is portable water
A
- Water that has been treated or is naturally safe to drink
- Not pure - can contain dissolved substances
- Level of dissolved salt not to high and PH of between 6.5 and 8.5- to reduce bacteria or microbes
17
Q
- What is fresh water
A
0 Natural water sources that have low levels of salt
18
Q
- What needs to happen to fresh water-
A
- Filtered before safe - wire mesh, sand then sterilisation by UV light, ozone or chlorine
19
Q
- How can you test the purity of a sample of water
A
- Distillation
- Ph test- need to neutralise-
- A water heats up it’ll evaporate and will enter condensing column as steam
- See if any crystals were formed to see salt content
20
Q
- How can sea water be trated
A
- Distillation
- Reverse osmosis - membranes- passed through that only allows water molecules through
- Not practical for large quantities due to high energy use
21
Q
- Where does waste water come from
A
- Many different sources
- Agricultural systems
- Domestic sources
- Industrial processes
22
Q
_ Why is waste water bad
A
- Organic matter
- Harmful chemicals
- Polluted
23
Q
- What are the stages of sewage treatment
A
- Before treated it is screened- scarped of large bits
- Its allowed to standing settlement tank- heavier parts sink- effluent at top- sedimentation- effluent removed
- Biological aerobic digestion- air pumped through to encourage aerobic bacteria to break down organic matter- including microbes
- Sludge is placed into large tanks- bacteria breaks it down by anaerobic digestion- breaks down - produces methane- then used as energy source- remaining used as fertiliser
- Waste containing toxic substances addictions substances may be added e.g chemicals, UV radiation, to membranes
24
Q
-What are the benefits and cons of waste water
A
- Mor exorcises by less energy than desalination of salt water
- Used as alternative in places without fresh water
e. g sinapore waste water is retreated for drinking water - However soenna poepie doet lief the idea of drinking waste water
