Chemistry unit 2 6CH02 exam.How was it?

[georgewest28]

the flame test was the first one no?

 

[livlivliv]

the flame test was the first one no?

no for the first one i said the one that decomposes first is magnesium carbonate. i might be wrong tho

 

[georgewest28]

as is said no

I said flame test

as is said not to use heat

 

[georgewest28]

they both made the oxide plus c02

 

[livlivliv]

as is said no
as is said not to use heat

did it???!??!?!?! OMG

 

[georgewest28]

yeah

 

[Zainkhan]

We add water(Cold) to both mgco3 and baco3 ... mg will be slightly soluble/ insoluble whereas Ba Will be every soluble

 

[livlivliv]

yeah

sh*t. there's another 2 marks gone then.

 

[georgewest28]

We add water(Cold) to both mgco3 and baco3 ... mg will be slightly soluble/ insoluble whereas Ba Will be every soluble

what about limewater? due to cation size etc?

 

[Zainkhan]

for the previous part of the qs you can test the time required for each of them to produce (co2) / turn limewater milky
Baco3 will produce co2 late/ turn lime water mily later than mgco3 because it is more stable ( less polarizing effect)

 

[georgewest28]

or

for the previous part of the qs you can test the time required for each of them to produce (co2) / turn limewater milky
Baco3 will produce co2 late/ turn lime water mily later than mgco3 because it is more stable ( less polarizing effect)

just flame colours of green and colourless?

 

[Zainkhan]

I dont think you can do flame test.. they said Without using heat and acid .. in flame test you need heat and hcl acid

 

[georgewest28]

I dont think you can do flame test.. they said Without using heat and acid .. in flame test you need heat and hcl acid

for the first one ( at the top of the page) it did not specify....

 

[jtbteddy]

me too

I said flame test

 

[aniekan]

I don't think that was one of the choices lol... they were;
A) intermolecular forces in water are stronger than that in hexane
B) the hexane molecules can't get in between the ions
C) energy is released when the ions are hydrated
D) the sodium and chloride ions can form hydrogen bonds with the water
... so I'm guessing you went for C?
That makes sense about the acid!
And I don't mean for the titration, I mean for the one about chlorine and bromine! xD

A

 

[svenas]

WHAT WAS THE ANSWER FOR DIFFERENCE IF WE ADD DILUTE SULFURIC ACID ????????????????

 

[livlivliv]

me too

I think we are wrong If we are VERY lucky we may get one mark for getting flame test and the correct colours but I doubt it

A

Good, same

 

[georgewest28]

w

I think we are wrong If we are VERY lucky we may get one mark for getting flame test and the correct colours but I doubt it




Good, same

why would we be wrong?! the question was about decomposition!!!!

 

[livlivliv]

i'm not talking about the first one, i was talking about the second

w
why would we be wrong?! the question was about decomposition!!!!

 

[georgewest28]

i'm not talking about the first one, i was talking about the second

i put limewater for the second one