- Messages
- 141
- Reaction score
- 25
- Points
- 28
Anyone taking chemistry AS in november ???
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
Ameenyup as Amy Bloom said, it just requires practice......inshaAllah you will get the hang of it real soon
anyone knows the energy cycle from jn 11 p41 q1)b)
the answer for the lattice energy is -12753 kJ per mol
autumnsakura For Q.36 the third option is put adhering to the fact that the reaction is reversible. If you think that the option is not correct, then it is fine. Increase in pressure always shifts the reaction towards the hand-side with fewer moles; in this case the reaction shifts to RHS so the option is wrong! Besides, all three options don't have to be right!
For Q.26. break down the graph into two. The first one then becomes an endothermic reaction curve and the second one becomes an exothermic reaction curve. Now look at the stages and mechanisms of the four reactions individually. Where do you think that first the bonds are broken and then formed? (DIY!)
I'm sorry i mis-interpreted the statement. The third option is *The rate of backward reaction increases*! Ofcourse it does. The rate of both the forward and backward reactions increases. Yes, the equillibrium shifts to RHS but because particles are more closer now its easier for them to be converted to products and reactants at the same time. So The more the pressure, the higher the rate.But for question 36, all three options are the answer. I like your explanation for question 26 though
May be at a bookshop , they are usually available in a form of a bookletdoes anyone know where can I get old chemistry past papers for as/a level (1993-2003) ???
they are not available on xtremepapers.com
since 0.02 moles of M react with 0.025 moles of Oxygen, 0.02 mole of M reacts with 0.025 x 2 moles of oxygen atoms (oxygen gas is diatomic)on heating, 0.02 moles of element M reacts with 0.025 moles of Oxygen gas. What is the empirical formula of the oxide of M?
A) M2O
B) MO2
C) MO4
D) M2O5
E) MO5
Anyone have notes for planning experiment -A2 ?
hey thnx this was where i got stuck: why didn't we take 2*+994 kJ/mol for N2??
There are no notes as such, just merge your experiences in the lab and your knowledge of chemistry and practice papers. That's what i would advise you. hope it helped.Does anyone have a write up on any of the experiments so i can just get an idea.. HELPP !!!!???
when u break an N2 (N-N) molecule (bond energy), u will get 2 N atoms (zat's wat u need)..hey thnx this was where i got stuck: why didn't we take 2*+994 kJ/mol for N2??
For almost 10 years, the site XtremePapers has been trying very hard to serve its users.
However, we are now struggling to cover its operational costs due to unforeseen circumstances. If we helped you in any way, kindly contribute and be the part of this effort. No act of kindness, no matter how small, is ever wasted.
Click here to Donate Now