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Chemistry GCSE > Testing for Cations, Anions and Gases > Flashcards

Testing for Cations, Anions and Gases Flashcards

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1
Q

What colour does Lithium burn with in a roaring Bunsen flame?

A

Red

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2
Q

What colour does Sodium burn with in a roaring Bunsen flame?

A

Yellow

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3
Q

What colour does Potassium burn with in a roaring Bunsen flame?

A

lilac

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4
Q

What colour does Calcium burn with in a roaring Bunsen flame?

A

orange-red

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5
Q

What colour does copper burn with in a roaring Bunsen flame?

A

blue-green

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6
Q

If you add NaOH (Sodium Hydroxide) to Copper (II), Cu2+, what colour is the precipitate?

A

Blue

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7
Q

If you add NaOH (Sodium Hydroxide) to Iron (II), Fe2+, what colour is the precipitate?

A

Sludgy green

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8
Q

If you add NaOH (Sodium Hydroxide) to Iron (III), Fe3+, what colour is the precipitate?

A

Reddish Brown

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9
Q

How do you test whether a substance contains ammonium ions (NH4+)

A

Add some NaOH (Sodium Hydroxide) to the mystery substance. If a gas is given off which turns damp red litmus paper blue then ammonia is present. It also smells of cats wee!

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10
Q

How do you test for Ammonia Gas?

A

Damp red litmus paper, if ammonia present the paper will turn blue

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11
Q

How can you test for carbonates?

A

Add Hydrochloric Acid to the potential carbonate. if carbonates are present then CO2 gas will be given off which turns Limewater milky and the carbonate will effervesce

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12
Q

How can you test for sulphates?

A

Add dilute Hydrochloric Acid and then barium chloride to the compound. If a white precipitate is formed (Barium Sulphate), the original compound was a sulphate

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13
Q

How do you test for a chloride ion?

A

Add dilute Nitric Acid followed by Silver Nitrate solution. If there is a chloride ion a white precipitate of Silver Chloride will be formed

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14
Q

How do you test for a bromide ion?

A

dd dilute Nitric Acid followed by Silver Nitrate solution. If there is a bromide ion a cream precipitate of Silver Bromide will be formed

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15
Q

How do you test for a iodide ion?

A

dd dilute Nitric Acid followed by Silver Nitrate solution. If there is a iodide ion a yellow precipitate of Silver Iodide will be formed

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16
Q

Why do you add the nitric acid when testing for a halide?

A

To get rid of carbonate or sulfate ions before the test

17
Q

How do you test for chlorine?

A

Use damp blue litmus paper, it will be bleached white if chlorine is present

18
Q

How do you test for oxygen?

A

Relights a glowing splint

19
Q

How do you test for Carbon Dioxide?

A

Bubble the gas through limewater, if it turns cloudy it is Carbon Dioxide

20
Q

How do you test for Hydrogen?

A

Hydrogen makes a squeaky pop with a lit splint

21
Q

What is a chemical test for water?

A

Add the “water” to anhydrous copper (II) sulphate. If it is water it will turn from white to blue

22
Q

What is the physical test for water?

A

Boil the “water”, if it boils at exactly 100 degrees centigrade then it is water

23
Q

What colour does Universal Indicator go for a strong acid?

A

Red

24
Q

What colour does Universal Indicator go for a strong alkali?

A

Purple

25
Q

What colour is Phenolphthalein in acidic conditions

A

Colourless

26
Q

What colour is Phenolphthalein go in alkaline conditions

A

Bright pink

27
Q

What colour is Methyl Orange in acidic conditions

A

Red

28
Q

What colour is Methyl Orange in alkaline conditions

A

Yellow

Chemistry GCSE (2 decks)

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