Chemistry Variant 32 Paper Discussion

[wooowooowoo]

Let's discuss the paper
What was the answer to the mole question ?
What did you write for the very last answer relating to iron (iii)

 

[mamoon123]

Let's discuss the paper
What was the answer to the mole question ?
What did you write for the very last answer relating to iron (iii)

I wrote that the base displaces the iron ions, and makes it form Fe(III) Oxide.
I think it's wrong though :/

 

[Ashay]

The base displaces the chloride. It makes it iron hydroxide which is red brown in colour.
The mole answer was c5h10.

 

[AsinSana]

Nooo becaue that salt was like ammonia therefore in ammonia iron turns rusty brown so therefore it turns brown!!

 

[Ashay]

Yeah because the chloride ions merge with ethyl amine to form ethyl ammonium chloride which was shown in the previous question..the hydroxyl ions from the aqueous salt merge with the iron ions.

 

[mamoon123]

And what did you guys write for displacing Ethylamine from it's chloride? :O
I just said add sodium.

 

[Ashay]

Oh you have to add sodium hydroxide and heat it.

 

[JOEJOE]

the mole question = ethene C2H4

The last question = coz it got reduced from Fe3+ to Fe solid after gaining electrons from ethylamine...

Why is plastic suitable : coz its light
has high mp bp
doesnt conduct e

Al used coz strong and light and doesnt corrode

Cu used coz its a good conductor of heat
and resists corrosion so is not toxic

To form NaOH from NACL by electrolysis of Conc NACL sol... Describe etc...

The formula for the alkene that oxidises to form one acid is ethen right? C2H4??

Can i use sodium nitrate to displace Ethylamine chloride??? thanks alot!

We use cryolite to decrease mp of al2O3 so that less energy is needed and to make it conduct better because al2O3 has a protective oxide layer bla

 

[wooowooowoo]

What I wrote was Fe (III) was formed which is reddish brown in color. - For the last question

 

[wooowooowoo]

the mole question = ethene C2H4

The last question = coz it got reduced from Fe3+ to Fe solid after gaining electrons from ethylamine...

Why is plastic suitable : coz its light
has high mp bp
doesnt conduct e

Al used coz strong and light and doesnt corrode

Cu used coz its a good conductor of heat
and resists corrosion so is not toxic

To form NaOH from NACL by electrolysis of Conc NACL sol... Describe etc...

The formula for the alkene that oxidises to form one acid is ethen right? C2H4??

Can i use sodium nitrate to displace Ethylamine chloride??? thanks alot!

We use cryolite to decrease mp of al2O3 so that less energy is needed and to make it conduct better because al2O3 has a protective oxide layer bla

Wasn't the the answer for the mole question C5H10 as 5 CO2 was produced making the number of n 5 ?

 

[JOEJOE]

We only use that formula for alkanes i think..

 

[mamoon123]

It was pentene. C5H10

 

[B333]

What did you write for the reasons why aluminium is used in the making of aircrafts?

 

[Bassem]

the mole question was C10H20

 

[Ashay]

the mole question was C10H20

No it was C5H10

 

[Ashay]

What did you write for the reasons why aluminium is used in the making of aircrafts?

Metal with low density, resistant to corrosion and strong and hard

 

[B333]

I wrote light and malleable. Is that correct?

 

[JOEJOE]

light yes malleable dont think so

 

[B333]

what about the one about why plastic was used for insulating electrical cables?

 

[Ashay]

The properties are correct but in this case, light is the important . You have to mention low density which makes it light. Also, resistance to corrosion is very important. If you wrote that it is light and malleable, you will get 1/3 marks