How was Chemistry P1/2

[hassan100]

well wat were ur answers?? i dunt remember the questions if u do plz tell me wat were the answers! i wana confirm!..

Well Copper carbonate was the least stable.......answer for mass part was that they all have differnet number of moles with 2 g , so differnet mass of Co2 was released
And, the ionic was bit complicated, I dont remember it ryte now
For the prepartaion of copper chloride, which was a soluble salt, i wrote" take excess amount of copper carbonate and mix it with dilute sulphuric acid( i guess these were the starting materials given ryte?). FILTER out excess copper carnbonate and evapourate the filtrate to the crystallization point. allow to cool and wash with water and then dry with filter paper"
Hope it helped

 

[Doosh Bag]

why didnt it went well

Baha'i is please write angraizi praapurrly.

 

[nightmaressana]

Well Copper carbonate was the least stable.......answer for mass part was that they all have differnet number of moles with 2 g , so differnet mass of Co2 was released
And, the ionic was bit complicated, I dont remember it ryte now
For the prepartaion of copper chloride, which was a soluble salt, i wrote" take excess amount of copper carbonate and mix it with dilute sulphuric acid( i guess these were the starting materials given ryte?). FILTER out excess copper carnbonate and evapourate the filtrate to the crystallization point. allow to cool and wash with water and then dry with filter paper"
Hope it helped

i think you meant dilute Hydrochloric acid.... =P

 

[pakisatan123]

i think you meant dilute Hydrochloric acid.... =P

but we didnt had to tell reactants onle the method i guess

 

[agha saad]

Q3 tha wo i think.
Carbonates wala was Q2.

hmm ho sakta hai :/ ab maths kee turn hai lolx hws prep.???

 

[beeloooo]

Come on guys .... It was B .... havent u done past papers related to this ? And mercury is a transition metal , so it is a good conductor of electricity Besides, whatever it was , leave it and dont discuss it cz it was worth one mark only

no answer to what I said NO FREE IONS

 

[plantaholic]

2 in the ENTIRE question ?!! At first i also thought i would get like 2 or 3 bt srf 1 number gya abt that ppt!

yes i think so

 

[plantaholic]

i'm going to boycott this page, i think.. it makes me feel like a dumbo.. i could do without another dose of depression i think...

 

[Minnie]

hmm ho sakta hai :/ ab maths kee turn hai lolx hws prep.???

Maths iss going finee abhi tak.
Doing past papers. what bout youu?

 

[maaz007]

-Dissolving
-Filtering
-Crystalliztion
Inorder to extract Copper Chloride! these were main points to be discussed!

 

[fatikhalid]

Well Copper carbonate was the least stable.......answer for mass part was that they all have differnet number of moles with 2 g , so differnet mass of Co2 was released
And, the ionic was bit complicated, I dont remember it ryte now
For the prepartaion of copper chloride, which was a soluble salt, i wrote" take excess amount of copper carbonate and mix it with dilute sulphuric acid( i guess these were the starting materials given ryte?). FILTER out excess copper carnbonate and evapourate the filtrate to the crystallization point. allow to cool and wash with water and then dry with filter paper"
Hope it helped

well thankyou!!! for telling me the answers i wrote!!....

 

[maaz007]

The question which asked about bulb going least bright was surely Graphit due to its relatively high resistivity! Referance wikipedia!
Metals sodium and mercury are good conductors whereas solid bromide didnt lit up the lamp so least bright wasnt an exception!
Graphite is also used to make resistors! so Bulb would be least bright in the case!

 

[maaz007]

The Methanol McQ was D due to correct structure ref<wikipedia and Methanol could literally not be oxidised to Methanoic Acid as further catalytic processes are still required ref<wikipedia search Formic Acid!. Ethanol could be oxidised and further in series! So D was the correct option!

 

[kiran11]

Bloomfield

which branch? i am also from BHS

 

[kiran11]

The lamp MCQ's answer was liquid mercury, since the mercury never discharges at the electrodes it will cause the lamp to light up dimly. Its similar to a past paper MCQ, they just changed the approach.
In p2, titration question we had to take 30cm3 as the volume since that was the amount neutralizing the acid. I think the concentration was 0.083 as beeloooo said.
In the electrolysis of Copper(II) Sulfate the Cu2+ ions are ALWAYS attracted towards the negative electrode no matter what the conditions, since it is lower than hydrogen. Sulfate ions are never discharged.
In the MCQ relating to Aluminium Oxide's electrolysis, the answer was that Aluminium is always formed at the cathode and Carbon Dioxide/Monoxide is always formed at the anode since the oxygen that is deposited corrodes away the carbon electrode by reacting with it.
Silver Nitrate was the answer for the MCQ regarding how to differentiate between HCl and HNO3 since a white precipitate of Silver Chloride will be formed in that case.

my all answers matches urz i hope all are correct now!

 

[kiran11]

500 x1000 as it was kilograms then divided by two for hydrogen's mrr was 2.

Multiply it to 49 and divide by 3.

Voila.

hurray! i did the same and got the same answer!! i was so afraid i mite get it wrong

 

[osama]

The Methanol McQ was D due to correct structure ref<wikipedia and Methanol could literally not be oxidised to Methanoic Acid as further catalytic processes are still required ref<wikipedia search Formic Acid!. Ethanol could be oxidised and further in series! So D was the correct option!

no....the structure did not show the O-H bond so it wasn't correct......answer was A

 

[MustafaMotani]

no....the structure did not show the O-H bond so it wasn't correct......answer was A

yeah I also wrot A.

 

[UziB]

my all answers matches urz i hope all are correct now!

Be rest assured, they are all 101% correct except for the MCQ regarding the lamp's brightness, there is still some doubt in that

 

[Monojit Saha]

Hey,, In paper 2, section A what was the least thermally stable carbonate? Copper or magnesium?