Unit 2 Oxidising agents Flashcards Preview

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Flashcards in Unit 2 Oxidising agents Deck (12)
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1
Q

What is colour change with acidified dichromate?

A

Orange to green

2
Q

What is colour change with hot copper oxide?

A

Black to red/brown

3
Q

What is colour change with Fehlings solution?

A

Blue to brick red

4
Q

What is colour change with Benedict’s solution?

A

Blue to brick red

5
Q

What is colour change with Tollen’s reagent?

A

Silver mirror forms

6
Q

What is colour change with acidified permanganate?

A

Purple to colouless

7
Q

Why do permaganate and dichromate solutions have to be acidified?

A

To provide a source of H+ (aq) ions

8
Q

Why is acidified permanaganate a useful indicator?

A

It is self-indicating and gives a clear end point due to clear colour change

9
Q

Show (by using ion-electron eq) that Fehlings and Benedicts are behaving as Oxidising Agents

A

Gain of electrons is reduction.

Oxidising agents are reduced

10
Q

Show (by using ion-electron eq) that Acidified Dichromate is behaving as an Oxidising Agent

A

Gain of electrons is reduction.

Oxidising agents are reduced

11
Q

Show (by using ion-electron eq) that Tollen’s Reagent is behaving as an Oxidising Agent

A

Gain of electrons is reduction.

Oxidising agents are reduced

12
Q

Show (by using ion-electron eq) that hot Copper Oxide is behaving as an Oxidising Agent

A

Gain of electrons is reduction.

Oxidising agents are reduced