C1-12 Potable water

What is 'potable'water

• Water that can be transported easily

• Bottled water

• Drinking water

• Water used for washing

Which of these is NOT a source of potable water?

• Aquifers

• Rain

• Sea water

• Waste water

Water that comes out of your taps has been treated to make it safe to drink, potable. The correct order that this process of water treatment occurs in is...

• aeration oxygenation filtration

• aeration

  filtration

  oxygenation

• filtration

  aeration oxygenation

• oxygenation aeration

  filtration

Waste water can be treated and cleaned to make potable water. Which of these is NOT part of the process.

• chemicals are added to remove impurities

• Desalination occurs to remove salt

• UV light is used to kill bacteria

• Air is added to encourage aerobic bacteria to grow

Tags

NGSS.MS-PS1-2

Some countries do not have ready access to potable water and use sea water. A solar still uses sea water to produce potable water? How does a solar still work?

• The sun evaporates the water which condenses on the lid

• The sun heats the water which is collected in the tank

• The sun makes the water rise to the top of the tank where it runs into the tank

• The sun condenses the water on the glass which then is added to the tank

Tags

NGSS.MS-ESS2-4

NGSS.MS-PS1-4

Two methods used to turn sea water into potable water are:-

• Desalination

  Distillation

• Purification

  Aeration

• Distillation

  Oxygenation

• Desalination

  Reverse osmosis

Reverse osmosis can be used to make potable water from sea water. Which of these correctly describes the process?

• salt water is forced through a membrane which only allows water molecules to pass through

• desalination occurs to remove salt

• heavy salt particles are removed by ultrafiltration

• plants soak up the salty water and are then burned to release the water

Why is chlorine added to drinking water?

• Chlorine kills microbes

• Chlorine is a gas

• Chlorine forms insoluble compounds

• Chlorine is acidic

Chlorination (disinfection) is a the last step in water treatment. In certain conditions chlorine can react with compounds found in the water to form potentially dangerous chemicals. Levels of these chemicals have to be carefully monitored. Why if this happens is chlorine used in water treatment?

• Chlorine kills microbes

• Chlorine is safe to use at low levels

• It is the last stage in the process before storage

• The benefits outweigh the risks.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Chlorine gas is used in water treatment.

What is the chemical test for chlorine gas?

• Lime water turns milky

• It relights a glowing splint

• Universal indicator turns blue

• Blue litmus turns red then white