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Chemistry - mw > Tests > Flashcards

Tests Flashcards

1
Q

Test for oxygen

A

A glowing splint relighting

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2
Q

Test for carbon dioxide

A

Limewater goes milky

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3
Q

Why does limewater go milky when you add carbon dioxide?

A

Carbon dioxide reacts with the calcium hydroxide forming calcium carbonate and water

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4
Q

Test for chlorine

A

Will bleach damp litmus paper,

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5
Q

What happens when you test for chlorine with blue litmus paper?

A

Blue litmus paper will turn red first then white - acidic gas

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6
Q

Test for ammonia

A

Turns damp red litmus paper blue (alkali)

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7
Q

Test for water

A

White anhydrous copper (II) sulphate turns blue

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8
Q

What type of reaction is the chemical test for water

A

Reversible, very exothermic

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9
Q

What is the physical test for water?

A

Boils at 100 degrees Celsius

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10
Q

Test for positive ions (cations)

A

Flame test

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11
Q

Describe a flame test

A
  1. Clean a piece of nichrome wire by dipping it in hydrochloride acid
  2. When the wire no longer gives a colour when placed in a roaring flame
  3. It is then dipped into what you are testing
  4. Observe colour
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12
Q

What colour do calcium ions go in a flame test

A

Brick red

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13
Q

What colour do potassium ions go in a flame test?

A

Lilac

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14
Q

What colour do sodium ions go in a flame test

A

Orange-yellow

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15
Q

What colour do lithium ions go in a flame test?

A

Red (Crimson)

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16
Q

What is the test for hydroxide ions?

A
  1. Add sodium hydroxide solution

2. Observe colour of precipitate

17
Q

Why does the hydroxide test work?

A

Because most metal hydroxides are insoluble in water (except group 1 metals)

18
Q

What colour does copper (II) precipitate form

A

Blue

19
Q

What colour does iron (III) precipitate form

A

Orange-brown

20
Q

What colour does iron (II) precipitate form

A

Green

21
Q

Test for carbonate ions (CO32-)

A
  1. Add dilute nitric acid
  2. Bubbles of gas will be observed
  3. Gas can be tested with limewater (carbon dioxide)
22
Q

Test for sulphate ions (SO42-)

A
  1. Add dilute hydrochloric acid
  2. Add barium chloride
  3. If sulphate ions are present a white precipitate is formed (barium sulphate)
23
Q

Why does the test for sulphate ions work?

A

Because barium sulphate is insoluble

24
Q

Formula for barium sulphate

A

BaSO4 (white precipitate)

25
Q

Test for halides

A
  1. Add dilute nitric acid
  2. Add silver nitrate solution
  3. Observe colour of precipitate
26
Q

What colour do chloride ions go in the halide test

A

White

27
Q

What colour do bromide ions go in the halide test

A

Cream

28
Q

What colour do iodide ions go in the halide test

A

Yellow

29
Q

Test for hydrogen

A

Lit splint goes out with squeaky pop

Chemistry - mw (3 decks)

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