Back to C10 Home
C10: Quiz 3 – Answers
C10: Quiz 3 – Answers
1) Sustainability means meeting the needs of the current generation without harming the ability of future generations to meet their needs
2) The 3 R’s are:
3)
a) Any 3 from:
4) An ore is a rock that contains a high enough quantity of a desirable metal to make it economically viable to extract the desired metal from the ore
5)
a) Bioleaching involves using bacteria to break down the low-grade copper ore to produce an acidic solution containing soluble copper ions – this solution is known as the leachate. We then extract the copper from the leachate by using electrolysis or a displacement reaction with a more reactive metal.
b) Any positive from:
6)
a) Phytoextraction/ phytomining involves growing plants in soil that contains low grade metal ores. The plants absorb the metals as they grow, and the absorbed metals build up in the leaves of the plants. The plants are then harvested, dried and burnt. The ash that is left behind contains soluble copper compounds. Copper can then be extracted from these soluble copper compounds by electrolysis or by a displacement reaction with a more reactive metal
b) Any positive from:
2) The 3 R’s are:
- Reduce – this is all about reducing the quantity of resources and waste that we use/ produce
- Reuse – this is all about reusing products many times/ for a long period of time
- Recycle – this is all about recycling the materials from an old product to make a new product
3)
a) Any 3 from:
- If we recycle metal, fewer mines are needed to extract the raw materials. This means that less land is cleared so habitats are preserved, less waste is produced, less energy is needed for the extraction etc.
- Recycling keeps the finite raw materials/ resources in the ground. This means that if the resource is non-renewable, the resource will run out further in the future
- Less energy is required to recycle materials compared to the amount of energy required to extract & process new materials
- Recycling materials means that less waste is sent to landfill, which reduces the amount of pollution from landfill sites and means that land doesn’t have to be cleared for new landfill sites
- Products that are going to be recycled need to be collected and transported. This costs money, needs organisation and requires fuel/ energy (which produces emissions)
- It can be quite hard to sort all of the different materials that a product is made from
- The number of steps in the recycling process depends on what the recycled product is being used for. Some substances need to be more pure than other substances so are harder to be recycled (e.g. copper)
4) An ore is a rock that contains a high enough quantity of a desirable metal to make it economically viable to extract the desired metal from the ore
5)
a) Bioleaching involves using bacteria to break down the low-grade copper ore to produce an acidic solution containing soluble copper ions – this solution is known as the leachate. We then extract the copper from the leachate by using electrolysis or a displacement reaction with a more reactive metal.
b) Any positive from:
- Bioleaching has a smaller impact on the envioronment compared to traditional ways of extracting copper
- Bioleaching lets us extract copper from low grade copper ores
- The process is very slow
- The process produces sulfuric acid, which can be damaging to the envioronment if not disposed of correctly
6)
a) Phytoextraction/ phytomining involves growing plants in soil that contains low grade metal ores. The plants absorb the metals as they grow, and the absorbed metals build up in the leaves of the plants. The plants are then harvested, dried and burnt. The ash that is left behind contains soluble copper compounds. Copper can then be extracted from these soluble copper compounds by electrolysis or by a displacement reaction with a more reactive metal
b) Any positive from:
- Phytoextraction/ phytomining has a smaller impact on the envioronment compared to traditional ways of extracting copper
- Phytoextraction/ phytomining lets us extract copper from low grade copper ores
Questions
1) Societies need to act in a sustainable way. What does sustainability mean?
2) What are the three words beginning with R that can help us to become more sustainable? Give a definition of each of the 3 words.
3)
a) Give and explain 3 benefits of recycling metal.
b) Give 2 disadvantages of recycling.
4) What is an ore?
Question 5 & 6 are for higher tier!
5) Bioleaching can be used to obtain copper from a low grade copper ore.
a) Explain how bioleaching obtains copper.
b) Give a positive of bioleaching.
c) Give a negative of bioleaching.
6) Phytoextraction/ phytomining can be used to obtain copper from a low grade copper ore.
a) Explain how phytoextraction/ phytomining obtains copper.
b) Give a positive of phytoextraction/ phytomining.
c) Give a negative of phytoextraction/ phytomining.
1) Societies need to act in a sustainable way. What does sustainability mean?
2) What are the three words beginning with R that can help us to become more sustainable? Give a definition of each of the 3 words.
3)
a) Give and explain 3 benefits of recycling metal.
b) Give 2 disadvantages of recycling.
4) What is an ore?
Question 5 & 6 are for higher tier!
5) Bioleaching can be used to obtain copper from a low grade copper ore.
a) Explain how bioleaching obtains copper.
b) Give a positive of bioleaching.
c) Give a negative of bioleaching.
6) Phytoextraction/ phytomining can be used to obtain copper from a low grade copper ore.
a) Explain how phytoextraction/ phytomining obtains copper.
b) Give a positive of phytoextraction/ phytomining.
c) Give a negative of phytoextraction/ phytomining.