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Chemistry > Paper 1 - Chemical Tests > Flashcards

Paper 1 - Chemical Tests Flashcards

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1
Q

Describe the test for hydrogen gas

A
  • Burn a lighted splint in hydrogen gas
  • Should produce a squeaky pop noise if the gas is hydrogen
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2
Q

Describe the test for oxygen gas

A
  • Burn a glowing splint in oxygen gas
  • The splint should relight if the gas is oxygen
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3
Q

Describe the test for carbon dioxide gas

A
  • Bubble carbon dioxide gas through limewater
  • Lime water should turn cloudy if the gas is carbon dioxide
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4
Q

Describe the test for chlorine gas

A
  • Place damp blue litmus paper in chlorine gas
  • Litmus paper should initially turn red but then turn white if it is chlorine gas
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5
Q

Describe the test for ammonia gas

A
  • Place damp red litmus paper in ammonia gas
  • Litmus paper should turn blue if the gas is ammonia
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6
Q

Describe how to carry out a flame test

A
  • Dip a platinum wire loop into dilute HCl to clean it
  • Hold the platinum wire loop in a flame - it will burn with no colour
  • Then dip the platinum wire loop into the sample that is being tested
  • Then place back in the clear blue part of the Bunsen flame
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7
Q

What colour is formed in the flame test of Li+

A

Red

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8
Q

What colour is formed in the flame test of Na+

A

Yellow

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9
Q

What colour is formed in the flame test of K+

A

Lilac

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10
Q

What colour is formed in the flame test of Ca2+

A

Orange-Red

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11
Q

What colour is formed in the flame test of Cu2+

A

Blue-Green

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12
Q

Describe the test for NH4+ using sodium hydroxide solution and identify the gas produced

A
  • add sodium hydroxide
  • will produce ammonia gas
  • Test for Ammonia gas using a damp piece of red litmus paper - the litmus paper will turn from red to blue
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13
Q

Describe the test for Cu2+ using sodium hydroxide solution and identify the gas produced

A
  • Add Aqueous Sodium Hydroxide
  • The colour of the precipitate will be Blue
  • Hydrogen gas produced
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14
Q

Describe the test for Fe2+ using sodium hydroxide solution

A
  • Add Aqueous Sodium Hydroxide
  • The colour of the precipitate will be Sludgy Green
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15
Q

Describe the test for Fe3+ using sodium hydroxide solution

A
  • Add Aqueous Sodium Hydroxide
  • The colour of the precipitate will be Red-Brown
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16
Q

Describe the test for Cl- using acidified silver nitrate solution and identify the gas produced

A
  • Add nitric acid to remove impurities such as carbonate ions
  • Add silver nitrate solution
  • A chloride gives a white precipitate of silver chloride
17
Q

Describe the test for Br- using acidified silver nitrate solution

A
  • Add nitric acid to remove impurities such as carbonate ions
  • Add silver nitrate solution
  • A bromide gives a cream precipitate of silver bromide
18
Q

Describe the test for I- using acidified silver nitrate solution and identify the gas produced

A
  • Add nitric acid to remove impurities such as carbonate ions
  • Add silver nitrate solution
  • An iodide gives a yellow precipitate of silver iodide
19
Q

Describe the test for SO4 2- using acidified barium chloride solution and identify the gas produced

A
  • Add hydrochloric acid to remove impurities such as carbonate ions
  • Add barium chloride solution
  • A white precipitate of barium sulphate forms means the original compound was a sulphate
20
Q

Describe the test for CO3 2- using hydrochloric acid and identify the gas produced and identify the gas produced

A
  • Add hydrochloric acid
  • If carbonate ions are present, fizzing will occur
  • Bubble CO2 gas produced through limewater
  • Limewater should turn cloudy if the gas is CO2
21
Q

Describe a test for the presence of water using anhydrous copper(II) sulfate

A
  • When Cu(II) Sulfate is bound to water, it forms blue crystals
  • Heat the blue hydrated Cu(II) Sulfate to evaporate the water
  • This leaves white anhydrous Cu(II) Sulfate powder
  • Add 3 drops of water to the white powder to form the blue crystals
22
Q

Describe a physical test to show whether a sample of water is pure

A
  • Heat water to exactly 100℃ and if it boils, it is pure
  • Cool water to 0℃ and if it freezes, it is pure

Chemistry (33 decks)

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