Water - exam practice
Water
Question 1 of 6
This question is about water.
Explain what is meant by the term potable water.
Explain how potable water can be produced from fresh water.
It is also possible to produce potable water from seawater.
Suggest a method you might use to obtain potable water from seawater.
Discuss one disadvantage of using distillation to obtain potable water.
This question is about the processing of water to create potable water.
Describe the role of filter beds in the filtration process.
After water has been filtered it needs to be sterilised.
Explain how and why the water needs to be sterilised.
State the name of the substance removed from seawater by desalination.
Potable water is not the same as pure water.
Explain the difference between potable water and pure water.
A student has a sample of dirty, undrinkable water.
The student wants to turn the dirty water into potable water.
Describe how the student could remove undissolved solids from the water.
Describe how the student could obtain potable water from the water obtained in part a).
The sample of water contains 14 g/dm3 of dissolved solids.
Calculate the mass of dissolved solids present in the 150 cm3 sample.
Give your answer in grams, and to 1 decimal places.
This question is about safe drinking water.
State the scientific term given to safe drinking water.
A student has a sample of water which they think is safe to drink.
Describe how the student could test the pH of the water, and what results would suggest the water is potable.
The student records a pH of 7.2 for the sample of water.
Describe the two other criteria for the water to be considered potable.
The student isn't sure if the sample contains bacteria.
Describe how the student could make water that contains bacteria safe to drink.
This question is about the processing of waste water.
The processes and descriptions below outline the stages of processing waste water.
Match the statements to their purpose.
Suggest one use for the solid sewage removed from the waste water.
Suggest one reason why the total mass of solid sewage processed increased between 2010 and 2020.
This question is about the processing of waste water.
Which of the following is the purpose of screening waste water?
How is liquid effluent processed in a waste treatment works?
How is waste water sterilised in the final stage of treatment?
Which of the following describes how solid sewage sludge is processed?