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Chemistry > Tests > Flashcards

Tests Flashcards

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1
Q

What is the test for halides?

A

Add dilute nitric acid then add silver nitrate, if a precipitate forms then a halide is present.

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2
Q

What is the test for NH4+?

A

Add sodium hyroxide (NaOH) to turn Ammonia into Ammonium, warm it to evaporate the Ammonium. If Ammonium is present the the red litmus paper will turn blue.

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3
Q

What is the ionic equation for Chlorides?

A

Ag+(aq) + HCl-(aq) > AgCl(s)

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4
Q

What is the ionic equation for Bromides?

A

Ag+(aq) + Br-(aq) > AgBr(s)

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5
Q

What is the ionic equation for Iodides?

A

Ag+(aq) + I-(aq) > AgI(s)

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6
Q

What is the reversible equation for the NH4+ test?

A

NH3 + HCl > NH4+ + Cl-

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7
Q

What colour would a Lithium ion turn a flame?

A

Crimson

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8
Q

What colour would a Sodium ion turn a flame?

A

Yellow

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9
Q

What colour would a Potassium ion turn a flame?

A

Lilac

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10
Q

What colour would a Calcium ion turn a flame?

A

Red

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11
Q

What colour would a Copper ion turn a flame?

A

Green

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12
Q

What would you add to a solution to test for transition metals?

A

Sodium Hydroxide

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13
Q

What precipitates are formed when each transition metal is present?

A 
Copper = Pale Blue
Iron(II) = Dirty Green
Iron(III) = Rusty Brown
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14
Q

What is the test for sulphates?

A

Add dilute hydrochloric acid

Then add barium chloride solution

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15
Q

How do you know when a sulphate ion is present?

A

A white precipitate is formed

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16
Q

What is the ionic equation for the sulphate test?

A

Ba2+(aq) + SO4 2-(aq) > BaSO4(s)

17
Q

What are qualitative techniques?

A

Observations

18
Q

What are quantitative techniques?

A

Measurements

19
Q

What is flame emission spectroscopy used for?

A

To analyse samples for metal ions

20
Q

What are two advantages of flame emission spectroscopy?

A

Accurate

Small amounts can be tested

Chemistry (2 decks)

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