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CHEMISTRY > Test Tube Tests > Flashcards

Test Tube Tests Flashcards

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1
Q

Which type of molecules react with bromine water?

A

Alkenes

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2
Q

Which type of molecules react with acidified potassium dichromate?

A

1° alcohols
2° alcohols
Aldehydes

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3
Q

Which type of molecules react with Tollen’s reagent?

A

Aldehydes

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4
Q

Which type of molecules react with Fehling’s solution?

A

Aldehydes

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5
Q

Which type of molecules react with sodium carbonate?

A

Carboxylic acids

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6
Q

What is the reagent used to test for alkenes?

A

Bromine water

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7
Q

What reagent is used to test for primary and secondary alcohols?

A

Acidified potassium dichromate

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8
Q

Which reagents are used to test for aldehydes?

A

Acidified potassium dichromate
Tollen’s reagent
Fehling’s solution

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9
Q

Which reagent is used to test for carboxylic acids?

A

Sodium carbonate

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10
Q

What observation is made when bromine water reacts with an alkene?

A

Orange to colourless

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11
Q

What observation is made when acidified potassium dichromate reacts with a 1° alcohol?

A

Orange to green

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12
Q

What observation is made when acidified potassium dichromate reacts with a 2° alcohol?

A

Orange to green

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13
Q

What observation is made when acidified potassium dichromate reacts with an aldehyde?

A

Orange to green

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14
Q

What observation is made when acidified potassium dichromate reacts with a ketone?

A

No visible change / solution stays orange

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15
Q

What observation is made when Tollen’s reagent is reacted with an aldehyde?

A

Silver mirror formed

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16
Q

What observation is made when Tollen’s reagent is reacted with a ketone?

A

No visible change

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17
Q

What observation is made when Fehling’s solution is reacted with an aldehyde?

A

Brick red precipitate formed

18
Q

What observation is made when Fehling’s solution is reacted with a ketone?

A

No visible change

19
Q

What observation is made when sodium carbonate reacts with a carboxylic acid?

A

Effervescence

20
Q

Why does bromine water go from orange to colourless when reacting with alkenes?

A

Electrophilic addition of Br2 to Alkene

21
Q

Why does acidified potassium dichromate go from an orange to green solution when adding a 1° alcohol / 2° alcohol / aldehyde?

A

(Cr2O7)2- (orange) reduced to Cr3+ (green) when alcohol / aldehyde oxidised

22
Q

Why does Tollen’s reagent form silver mirror when you react it with aldehyde?

A

Ag+ in Tollen’s reagent reduced to Ag(s) when aldehyde oxidised

23
Q

Why is there no visible change when you react acidified potassium dichromate with ketones?

A

Ketones cannot be further oxidised

24
Q

Why is there no visible change when you react Tollen’s reagent with ketones?

A

Ketones cannot be further oxidised

25
Q

Why does Fehling’s solution form brick red precipitate when reacted with aldehyde?

A

Fehling’s solution reduced when aldehyde is oxidised

26
Q

Why is there no visible change when you react Fehling’s solution with ketones?

A

Ketones cannot be further oxidised

27
Q

Why is effervescence formed when you react sodium carbonate with carboxylic acids?

A

Formation of CO2

28
Q

What reagent is used to test for Ba2+ ions?

A

H2SO4

29
Q

What reagent is used to test for SO4^2-?

A

BaCl2

30
Q

What reagent is used to test for Mg^2+ ions?

A

NaOH

31
Q

What reagent is used to test for OH- ions?

A

MgCl2

32
Q

What reagent is used to test for Cl-?

A

AgNO3

33
Q

What reagent is used to test for Br- ions?

A

AgNO3

34
Q

What reagent is used to test for I- ions?

A

AgNO3

35
Q

What reagent is used to test for AgCl?

A

Dilute NH3

36
Q

What reagent is used to test for AgBr?

A

Concentrated NH3

37
Q

What reagent is used to test for NH4^+?

A

NaOH & Heat

38
Q

What reagent is used to test for CO3^2-?

A

Any acid (HNO3 is best)

39
Q

What observation is made when reacting Ba2+ ions with H2SO4?

A

White precipitate

40
Q

What observation is made when reacting SO4^2- ions with BaCl2?

A

White precipitate

CHEMISTRY (8 decks)

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