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IGCSE CHEMISTRY MATS > 10 - Chemical Analysis > Flashcards

10 - Chemical Analysis Flashcards

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1
Q

How would you test for oxygen?

A

Relights a glowing splint

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2
Q

How would you test for carbon dioxide?

A

Turns lime water cloudy

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3
Q

How would you test for ammonia?

A

Damp red litmus paper will turn blue (heat the test solution to get ammonia gas)

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4
Q

How would you test for hydrogen?

A

Squeaky pop when a lighted splint is placed into a test tube with hydrogen

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5
Q

How would you test for chlorine?

A

If you put a damp blue litmus paper into a test tube with chlorine, it will bleach the damp blue litmus paper.

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6
Q

How would you carry out a flame test?

A
  1. Heat up a nichrome wire on the edge of a roaring blue flame.
  2. Let it cool down slightly.
  3. Dip it into HCl and then into the salt to be tested.
  4. Put this back on the edge of the roaring blue flame and observe the colour.
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7
Q

What is the colour of flame of Lithium?

A

red

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8
Q

What is the colour of flame of sodium?

A

yellow

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9
Q

What is the colour of flame of potassium?

A

lilac

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10
Q

What is the colour of flame of calcium?

A

orange-red

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11
Q

What is the colour of flame of copper?

A

blue-green

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12
Q

How would you test for cations?

A
  1. Dissolve salt into distilled water
  2. Add a few drops of sodium hydroxide
  3. Observe the colour of the precipitate
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13
Q

What is the colour of precipitate of copper?

A

blue

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14
Q

What is the colour of precipitate of calcium?

A

white, no change in excess sodium hydroxide

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15
Q

What is the colour of precipitate of aluminium?

A

white, redissolves in excess sodium hydroxide

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16
Q

What is the colour of precipitate of ammonium?

A

no precipitate

17
Q

What is the colour of precipitate of iron(II)?

A

green

18
Q

What is the colour of precipitate of iron(III)?

A

brown

19
Q

What are cations?

A
  • positive

- metals

20
Q

What are anions?

A
  • negative

- non metal

21
Q

How would you test for halides?

A
  1. place a 1cm depth of potassium chloride, potassium bromide and potassium iodide in seperate test tubes
  2. add 1cm depth of nitric acid to each test tube
  3. add a few drops of cm depth of silver nitrate
  4. note the colour change
22
Q

Why would you not want to use a lot of silver nitrate?

A

This solution contains silver, silver is expensive, not waste money

23
Q

What is the colour of precipitate of chloride?

A

white

24
Q

What is the colour of precipitate of bromide?

A

cream

25
Q

What is the colour of precipitate of iodide?

A

yellow

IGCSE CHEMISTRY MATS (7 decks)

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