1.
State what is meant by a finite resource.
[1 mark]
- will run out / used faster than it forms
JD SCIENCE
Water and solutions
Indicative marking points. Award marks for equivalent scientific or mathematical wording. Do not issue this sheet with the student worksheet.
2.
State what is meant by a renewable resource.
[1 mark]
- can be replaced as fast as it is used
3.
State what is meant by potable water.
[1 mark]
- water safe to drink
4.
State what is meant by desalination.
[1 mark]
- removing salt from seawater
5.
State what is meant by waste-water treatment.
[1 mark]
- screening, sedimentation, anaerobic digestion, sterilising
6.
State what is meant by life-cycle assessment.
[1 mark]
- impact of a product from raw materials to disposal
7.
State what is meant by recycling metals.
[1 mark]
- melting and remaking
8.
State what is meant by phytomining.
[1 mark]
- plants absorb metal ions from soil
9.
State what is meant by bioleaching.
[1 mark]
- bacteria extract metals from ores
10.
State what is meant by an alloy.
[1 mark]
- mixture of a metal with other elements
11.
Owain is asked about a finite resource in a WJEC Chemistry paper.
(a) [2 marks]
- fossil fuels, metal ores
(b) [3 marks]
- need recycling
12.
Owain is asked about a renewable resource in a WJEC Chemistry paper.
(a) [2 marks]
- timber if replanted, wool
(b) [3 marks]
- more sustainable
13.
Owain is asked about potable water in a WJEC Chemistry paper.
(a) [2 marks]
- not necessarily pure H₂O
(b) [3 marks]
- filtered and sterilised
14.
Owain is asked about desalination in a WJEC Chemistry paper.
(a) [2 marks]
- distillation or reverse osmosis
(b) [3 marks]
- high energy cost
15.
Owain is asked about waste-water treatment in a WJEC Chemistry paper.
(a) [2 marks]
- before release
(b) [3 marks]
- reduces disease
16.
Owain is asked about life-cycle assessment in a WJEC Chemistry paper.
(a) [2 marks]
- energy, water, waste
(b) [3 marks]
- used to compare bags / bottles
17.
A tap produces 8 dm³/min. Volume in 5 minutes
[3 marks]
- Final answer: 40 dm³
18.
Recycling aluminium uses 5% of the energy of extraction. Energy saved as a percentage
[3 marks]
- Final answer: 95%
19.
A bottle has a mass of 40 g. How many bottles in 2.0 kg
[3 marks]
- Final answer: 50
20.
Salt water is 3.5% salt. Mass of salt in 200 g of seawater
[3 marks]
- Final answer: 7.0 g
21.
A filter removes 92% of particles. Particles remaining from 250 mg
[3 marks]
- Final answer: 20 mg
22.
Cost of desalination is £1.20 per m³. Cost for 15 m³
[3 marks]
- Final answer: £18.00
23.
Owain carries out a WJEC-style required practical linked to using resources and water. This is a typical WJEC required-practical style question.
(a) [2 marks]
- Independent: the independent variable for this topic
- Dependent: the measured outcome
(b) [2 marks]
- keep all other variables constant
- so the test is fair / only one variable is changed
(c) [2 marks]
- repeat and calculate a mean / use a tighter method
24.
Owain carries out collecting valid data for using resources and water. This is a typical WJEC required-practical style question.
(a) [2 marks]
- Independent: a chosen factor
- Dependent: a quantitative measurement
(b) [2 marks]
- calibrated instrument
- so the test is fair / only one variable is changed
(c) [2 marks]
- systematic error from zero error
25.
Owain carries out drawing a graph for using resources and water. This is a typical WJEC required-practical style question.
(a) [2 marks]
- Independent: x-variable
- Dependent: y-variable
(b) [2 marks]
- same scale / same apparatus
- so the test is fair / only one variable is changed
(c) [2 marks]
- not drawing a line of best fit through the trend
26.
Owain carries out evaluating a method about using resources and water. This is a typical WJEC required-practical style question.
(a) [2 marks]
- Independent: method change
- Dependent: precision / accuracy
(b) [2 marks]
- same sample size
- so the test is fair / only one variable is changed
(c) [2 marks]
- too few repeats
27.
Compare a finite resource with a renewable resource.
[4 marks]
- will run out / used faster than it forms
- can be replaced as fast as it is used
- give one linked difference
28.
Compare a renewable resource with potable water.
[4 marks]
- can be replaced as fast as it is used
- water safe to drink
- give one linked difference
29.
Compare potable water with desalination.
[4 marks]
- water safe to drink
- removing salt from seawater
- give one linked difference
30.
Compare desalination with waste-water treatment.
[4 marks]
- removing salt from seawater
- screening, sedimentation, anaerobic digestion, sterilising
- give one linked difference
31.
Apply your knowledge of recycling metals to this situation: saves energy vs extraction
[3 marks]
- saves energy vs extraction
32.
Apply your knowledge of phytomining to this situation: burn plants to get ash
[3 marks]
- burn plants to get ash