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Chemistry > Purifying And Testing Water > Flashcards

Purifying And Testing Water Flashcards

0
Q

What does using water (especially hot water) use, increase and contribute to?

A

It uses energy and increases emissions of green house gases which contributes to climate change

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1
Q

What are the 4 main sources of water?

A

Rivers
Lakes
Reservoirs
Aquifers (underground)

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2
Q

What may water contain?

A

Insoluble materials
Sales and minerals
Microbes
Pollutants

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3
Q

Examples of pollutants

A

Nitrates - fertilisers
Lead - old water pipes
Pesticides residues

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4
Q

How is water purified?

A

Sedimentation
Filtration
Chlorination

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5
Q

What is sedimentation?

A

Allowing solid particles to settle out

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6
Q

What is filtration?

A

Removing smaller suspended solid particles

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7
Q

What is chlorination?

A

Killing microbes

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8
Q

What might be left in the water after it has been purified?

A

Soluble substances - some poisonous and some that don’t need to be removed

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9
Q

What is added to water to test for sulphate ions?

A

Barium chloride solution

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10
Q

What is added to water to test for chloride ions?

A

Silver nitrate solution

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11
Q

What is added to water to test for bromide ions?

A

Silver nitrate solution

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12
Q

What is added to water to test for iodide ions?

A

Silver nitrate solution

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13
Q

What will form if there is sulphate ions in water?

A

White precipitate

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14
Q

What will form if there is chloride ions in the water?

A

White precipitate

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15
Q

What will form if there is bromide ions in the water?

A

Cream precipitate

16
Q

What will form if there is iodide ions in the water?

A

Yellow precipitate

17
Q

When sodium sulphate and barium react together what do they make?

A

Sodium chloride and barium sulphate

18
Q

When sodium chloride and silver nitrate react together what do they make?

A

Sodium nitrate and silver chloride

19
Q

What is a precipitation reaction?

A

2 solutions react together and one of the products is a solid called a precipitate

20
Q

What type of reaction is a precipitation reaction?

A

Fast reaction which happens when ions collide

21
Q

What is distillation?

A

When pure water is obtained from sea water

22
Q

Where is distillation done?

A

In hot countries with low rainfall

23
Q

Why is distillation expensive?

A

It requires a lot of energy

Chemistry (8 decks)

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