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Potable Water (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Potable Water' from the broader topic Using Resources. The test is geared towards the AQA exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

What is the main advantage of using UV light for disinfection of potable water?
Why might a water company use both filtration and chlorination together, rather than only one of these steps?
Which ion is mainly responsible for temporary hard water that can be removed by boiling?
What is the correct definition of potable water?
A supplier finds nitrate (NO3-) concentration above safe levels in groundwater used for drinking. Which is the main health concern?
What is a major disadvantage of desalination (turning seawater into drinking water)?
Which parameter is most directly measured to decide if drinking water is safe from acidity or alkalinity?
What does a high turbidity reading indicate about a water sample?
Which analytical measurement gives the total dissolved solids (TDS) in a water sample?
Why is monitoring the chlorine residual important at the far end of a drinking water distribution system?
What is the main purpose of screening during water treatment at a waterworks?