iGCSE C11 Water Treatment

How do we test for water?

• Copper (III) sulfate

• Copper (II) sulfate

• Cobalt (III) chloride

• Cobalt (II) chloride

How will cobalt chloride appear in the presence of water?

• Yellow

• Pink

• Blue

• Green

How will copper sulfate appear in the presence of water?

• Yellow

• Pink

• Blue

• Green

How much water on earth is fresh?

• 1%

• 3%

• 5%

• 7%

How much water on earth is available for use (eg drinking)?

• 0.5%

• 1%

• 3%

• 3.5%

What are the two methods for water treatment?

• Evaporation

• Filtration

• Salination

• Chlorination

How would we describe water that is safe to drink?

• Pure

• Potable

• Waste

How would we describe water that contains no dissolved substances?

• Pure

• Potable

• Waste

How would we describe water that has been used by industry, homes and farming?

• Pure

• Potable

• Waste