Chemical Tests Flashcards

1
Q

How to test for hydrogen?

A

Hydrogen makes a squeaky pop with a lit splint

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2
Q

How to test for oxygen?

A

Oxygen will relight a glowing splint

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3
Q

How to test for carbon dioxide?

A

Carbon dioxide will turn limewater cloudy

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4
Q

How to test for ammonia?

A

Ammonia will turn damp litmus paper red to blue

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5
Q

How to test for chlorine?

A

Chlorine will bleach damp blue litmus paper turning it white

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6
Q

How to test for water?

A

When copper(II) sulfate crystals are bound to water they turn blue

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7
Q

How to test if a sample is pure?

A

Use the defined physical properties like boiling point and freezing point.

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8
Q

How do you carry out a flame test?

A

1) Clean a platinum wire loop by dipping it in some dilute HCL
2) Hold the loop in the flame and if it burns without any color you can dip it into the sample you want to test

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9
Q

What color will lithium be under a flame?

A

Red

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10
Q

What color will sodium be under a flame?

A

Yellow

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11
Q

What color will potassium be under a flame?

A

Lilac

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12
Q

What color will calcium be under a flame?

A

Orange - red

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13
Q

What color will copper be under a flame?

A

Blue - green

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14
Q

What color will the precipitate of copper be when in sodium hydroxide?

A

Blue

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15
Q

What color will the precipitate of iron(II) be when in sodium hydroxide?

A

Sludgy green

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16
Q

What color will the precipitate of iron(III) be when in sodium hydroxide?

A

Reddish brown

17
Q

How do you test for ammonium ions(NH4)?

A

Add sodium hydroxide to a solution and ammonia will be given off

18
Q

How do you test for chloride, bromide or iodide ions?

A

Add dilute nitric acid followed by silver nitrate solution

19
Q

What color will the precipitate be of a chloride ions?

A

White

20
Q

What color will the precipitate be of a bromide ions?

A

Cream

21
Q

What color will the precipitate be of a iodide ions?

A

Yellow

22
Q

How do you test for sulfate ions(SO4 2-)?

A

Add dilute HCL followed by barium chloride solution

23
Q

What color will the precipitate be of a sulfate ion?

A

White

24
Q

How do you test for carbonates?

A

Add dilute hydrochloric acid to the sample, if carbonates are present then carbon dioxide will be released