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OLD Y13 Chem > Test Tube Tests > Flashcards

Test Tube Tests Flashcards

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1
Q

How do you test for an alkene?

A

Bromine water

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2
Q

What is observed when an alkene is added to bromine water?

A

The Bromine water changes from orange to colourless.

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3
Q

Why does an alkene decolourise bromine water?

A

It reacts by electrophilic addition

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4
Q

What does sodium carbonate test for?

A

Acids

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5
Q

What is observed when sodium carbonate is added to an acid?

A

Effervescence (CO2 gas is released)

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6
Q

What is observed when acidified potassium dichromate is added to a primary alcohol?

A

The dichromate is reduced changing from orange to green

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7
Q

What is observed when acidified potassium dichromate is added to a secondary alcohol?

A

The dichromate is reduced changing from orange to green

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8
Q

What is observed when acidified potassium dichromate is added to an aldehyde?

A

The dichromate is reduced changing from orange to green

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9
Q

What is observed when acidified potassium dichromate is added to a tertiary alcohol?

A

No change (tertiary alcohols can not be oxidised)

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10
Q

What is observed when acidified potassium dichromate is added to a ketone?

A

No change (ketones can not be oxidised by potassium dichromate)

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11
Q

What is observed when acidified potassium dichromate is added to a carboxylic acid?

A

No change (carboxylic acids can not be oxidised by potassium dichromate)

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12
Q

Tollen’s reagent is a test for which functional group?

A

Aldehyde

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13
Q

What is observed when Tollen’s reagent is added to an aldehyde?

A

A silver mirror forms

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14
Q

What happens to an aldehyde when it is tested using Tollen’s reagent?

A

the aldehyde is oxidised to a carboxylic acid

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15
Q

What is observed when Tollen’s reagent is added to a ketone?

A

No visible change

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16
Q

What reagent is used to test for ammounium ions?

A

Heat with NaOH

17
Q

What is observed when ammounium (NH4+) ions are heated with NaOH

A

Gas released turns red litmus paper blue

18
Q

What gas is released when ammonium ions are warmed with NaOH

A

ammonia gas (NH3)

19
Q

What is Fehlings solution a test for?

A

Aldehydes

20
Q

What is observed when an aldehyde reacts with Fehling’s solution?

A

Brick red precipitate

OLD Y13 Chem (9 decks)

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