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Chemistry LR > Chemical Testing > Flashcards

Chemical Testing Flashcards

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1
Q

Describe the chemical test for: Oxygen

A

Glowing splint
Positive result: relights

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2
Q

Describe the chemical test for: Hydrogen

A

Lit splint
Positive result: squeaky pop

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3
Q

Describe the chemical test for: Carbon dioxide

A

Lime water
Positive result: cloudy/chalky emulsion

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4
Q

Describe the chemical test for: Ammonia

A

Damp red litmus paper
Positive result: turns blue

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5
Q

Describe the chemical test for: Chlorine

A

Damp blue litmus paper
Positive result: turns bleach white

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6
Q

Describe the chemical test for: Water

A

Anhydrous copper sulphate
Positive result: turns blue

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7
Q

What part of a compound can be deduced using the flame test?

A

Positive metal ion

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8
Q

What material wire do you use for the flame test?

A

Platinum or Nichrome

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9
Q

Why do we use the materials we do, for the wire in the flame test?

A
  1. Doesn’t produce a colour in the flame test
  2. High melting point
  3. Unreactive/inert
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10
Q

What solution is the wire dipped into, in the flame test?

A

Hydrochloric acid

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11
Q

Why do we dip the wire into a solution, in the flame test?

A
  1. To sterilise/clean the wire so it’s not contaminated
  2. To make sure the substance sticks to the wire
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12
Q

What colour does Lithium produce in the flame test?

A

Red

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13
Q

What colour does Sodium produce in the flame test?

A

Yellow

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14
Q

What colour does Potassium produce in the flame test?

A

Lilac

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15
Q

What colour does Calcium produce in the flame test?

A

Orange-red

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16
Q

What colour does Copper produce in the flame test?

A

Blue-green

17
Q

What part of a compound can occasionally be deduced by adding sodium hydroxide?

A

Positive ion/cation

18
Q

What is the positive result for Copper upon addition of NaOH (sodium hydroxide)?

A

Blue

19
Q

What is the positive result for Iron (ii) upon addition of NaOH (sodium hydroxide)?

A

Green

20
Q

What is the positive result for Iron (iii) upon addition of NaOH (sodium hydroxide)?

A

Brown

21
Q

What is the positive result for Ammonium upon addition of NaOH (sodium hydroxide)?

A

Fizzing as ammonia gas is produced

22
Q

What is the chemical test for carbonate anions?

A

Hydrochloric acid
Positive result: fizzing as CO2 is produced

23
Q

What is the chemical test for sulphate anions?

A

Barium chloride
Positive result: white precipitate

24
Q

How do you test for halide anions?

A

Add nitric acid and silver nitrate solution (to form acidified silver nitrate)

25
Q

What is the positive result for Chlorine anions?

A

White precipitate (milk)

26
Q

What is the positive result for Bromide anions?

A

Cream precipitate (cream)

27
Q

What is the positive result for Iodide anions?

A

Yellow precipitate (butter)

Chemistry LR (1 decks)

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