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2020 Semester 2 Science Exam > Water Analysis Part 8 > Flashcards

Water Analysis Part 8 Flashcards

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1
Q

What does a hydroxide do to litmus?

A

Turns litmus blue

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2
Q

What does bromide form when mixed with silver nitrate?

A

Creamy precipitate

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3
Q

What does nitrate form when warmed with aluminium and sodium hydroxide?

A

Ammonia smell, turns litmus blue

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4
Q

What does chloride form when mixed with silver nitrate?

A

White precipitate

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5
Q

What does sulphate form when mixed with barium chloride and nitric acid?

A

White precipitate

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6
Q

What does a phosphate form when mixed with ammonium molybdate?

A

Yellow precipitate

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7
Q

What does a carbonate form when mixed with hydrochloric acid?

A

Effervescence occurs, gas turns limewater milky

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8
Q

What does iron (ii) form when mixed with K3FeCN6?

A

Dark blue precipitate

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9
Q

What does an iodide form when mixed with silver nitrate and ammonia?

A

Cloudy yellow precipitate

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10
Q

What can chemical tests be split into?

A

General tests or specific tests

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11
Q

What do general tests help you to identify?

A

The nature of the chemical, whether it is an acid, alkali, soluble or ionic

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12
Q

What do specific tests identify?

A

The particles in a substance

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13
Q

What is a precipitate?

A

An insoluble solid that forms during an aqueous reaction

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14
Q

What is the WQI?

A

Water quality index, which uses a series of tests to determine a stream’s water quality and the overall health of the stream

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15
Q

What are the ranges of the water quality index ratings?

A 
Very Poor = 0-25
Poor = 25-50
Medium = 50-70
Good = 70-90
Excellent = 90-100
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16
Q

What are the factors which affect water temperature?

A

Air temperature, amount of shade, soil erosion, turbidity and thermal pollution

17
Q

What are the effects of water temperature?

A

Solubility of dissolved oxygen, rate of plant growth, metabolic rate of organisms and resistance in organisms

18
Q

In Victoria, what is the temperature range of water?

A

4°C in winter to above 25°C in summer

19
Q

What are the factors which affect pH levels of water?

A

Acidic rainfall, algal blooms, releases from industrial processes and level of hard-water minerals

20
Q

What is the pH value of streams and lakes usually between?

A

pH 7-8

21
Q

What is the pH range acceptable for most drinking water standards?

A

pH 6.5-8.5

22
Q

What pH range does rainfall generally have?

A

Between 5-6.5 pH

23
Q

What is the pH range which is optimal for most organisms?

A

6.5-8.2 pH

2020 Semester 2 Science Exam (32 decks)

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