OMG CHEMISTRY UNIT 1 PAPER!!!!!!!!!!!!

[shoaeb]

ohh alright..my bad

 

[Wearewhoweare]

B was the reaction with exio.. blah blah blah weird compound :S A was the polyethene one and i chose that

 

[Wearewhoweare]

Any idea about the evidence for ionic compounds or whatever? i put B about the confuctivity

 

[tanzina500]

I gave it 5 delta T..wat abt the ionisation of hydrogen?and the eqn including nitrogen n tritium? I found that totally out of chem!!!

 

[tanzina500]

Any idea about the evidence for ionic compounds or whatever? i put B about the confuctivity

mee too..crossed B!!

 

[OrlandoBloom<3]

Okay for the delta T one is is for sure 1/5 for sureeeeeee ! what did you guys write for the color of the crystals and the next question about another ion in the formula ?

 

[OrlandoBloom<3]

and for the cracking it was ethene and hydrogen , there is no such thing as methene

 

[OrlandoBloom<3]

oh and omg what did you guys write for how to show that excesss was addedddd ?

 

[OrlandoBloom<3]

THAT WAS SUCH A STUPID QUESTION ABOUT THE EXCESS I WAS SO SO MAD AT THEM -.-

 

[tanzina500]

how can it be 1/5??

Okay for the delta T one is is for sure 1/5 for sureeeeeee ! what did you guys write for the color of the crystals and the next question about another ion in the formula ?

 

[Wearewhoweare]

Okay for the delta T one is is for sure 1/5 for sureeeeeee ! what did you guys write for the color of the crystals and the next question about another ion in the formula ?

since it contained potassium i wrote pink/lilac :S dunno

 

[Wearewhoweare]

oh and omg what did you guys write for how to show that excesss was addedddd ?

i said weigh the mixture before and after lol

 

[OrlandoBloom<3]

how can it be 1/5??

Okay see do you know how to calculate the enthalpy change using the experemental data values ?
Enthalpy change = energy transferred/no. of moles
The no. of moles was five times of the previous moles that were used there fore : Delta T x massx SHC / 5
which simplifies to 1/5 x delta T
Understood ?
Anyone has the idea of the grade boundaries , this was my first time giving an edexcel paper so I am not sure of the whole grade boundary procedure ! thanks
Btw how was your paper ?

 

[OrlandoBloom<3]

since it contained potassium i wrote pink/lilac :S dunno

I wrote the same but some people said it should be white crystals cuz they have no color ..

 

[OrlandoBloom<3]

i said weigh the mixture before and after lol

LOL I dont really understand how that would show

 

[sunnyclone]

It was REALLY different. What did you guys write for that electron affinity question down group 7

increases cuz there is more shielding and more repulsion. Also the force of attraction from the nucleus is less so more energy is needed to add the electron. Thats what i think as i did not know we had affinity x.x

 

[sunnyclone]

i dont thin

Okay see do you know how to calculate the enthalpy change using the experemental data values ?
Enthalpy change = energy transferred/no. of moles
The no. of moles was five times of the previous moles that were used there fore : Delta T x massx SHC / 5
which simplifies to 1/5 x delta T
Understood ?
Anyone has the idea of the grade boundaries , this was my first time giving an edexcel paper so I am not sure of the whole grade boundary procedure ! thanks
Btw how was your paper ?

i dont think thats right. There are more moles so there is a bigger reaction producing more energy right?

 

[OrlandoBloom<3]

See you need to use calculation for getting the right answer , okay tell me your method then ? did you used calculation or just assume ?

 

[OrlandoBloom<3]

the enthalpy change is indirectly propotional no the no. of moles , so more means less enthalpy change and thus less energy produced . Are you understanding my concept?

 

[sunnyclone]

but more moles means a greater rise in temperature
more volume= greater rise
more volume less moles= less rise????