WJEC Chemistry Water

What is the first step in the water treatment process?

• coagulation
• filtration
• flocs
• concentation

What happens after filtration?

• coagulation

• second filtration

• Sedimentation

• chlorination

This process kills germs and bacteria and makes water safe to drink

• Sedimentation
• Chlorination
• Carbonation
• Filtration

Where does our drinking water come from?

• Rivers

• Sewage Drains

• Reservoirs

• Ponds

What is an advantage of fluoridation?

• Reduces tooth decay

• Causes dental fluorosis

• Causes bone cancer

• It is in toothpaste

Why do some people oppose fluoridation?

• Linked to cancers

• Mass medication

• Helps teeth

• It tastes funny

What makes hard water?

• Potassium

• Calcium

• Magnesium

• Sodium

What compound is responsible for permanent hard water?

• Calcium sulfate

• Magnesium iodide

• Calcium hydrogen carbonate

• Calcium

How can we soften hard water?

• Boiling

• Sodium carbonate

• Ion exchange

• Sodium Chloride

What is the name of the process that removes salt from water?

• Evaporation

• Distillation

• Desalination

• Filtration