Chapter 14: The Earth's Resources

What is removed from the reservoir water during stage 1?

Solids

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Name one chemical that can be added to sterilise the water in stage 2?

Chlorine

2 of 8

Why is it not correct to describe the drinking water in figure 1 as pure?

There is still other elements in the water, meaning it is not pure but it is safe to drink

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Name this technique

Distillation

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Name the change of state that occurs at A

Water evaporates (liquid to gas)

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Name the change of state that occurs at B

Water condenses (gas to liquid)

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This technique is not often used to produce drinking water from salty water. Suggest why?

The water we drink isn't entirely pure, it has different elements in it such as chlorine, and this method produces pure water.

7 of 8

Describe how you could show that this water does not contain dissolved solids without using a chemical test.

A way of testing whether the water has dissolved solids in it would be to filter the water, and see if there is any residue left behind.

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Other cards in this set

Name one chemical that can be added to sterilise the water in stage 2?

Chlorine

Why is it not correct to describe the drinking water in figure 1 as pure?

Name this technique

Name the change of state that occurs at A

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