-
We need your support!
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)
Search results
-
Main formulas for A2 physics - Applications
Was wondering if anyone could tell me which are the main formulas you need to know for doing the Applications part of the A2 Physics exam. Help is appreciated. Thank you. -
Chemistry: Post your doubts here!
The answer is B. 1 is correct for the obvious reason that OH- from the first eq (equilibrium) and H+ from the second eq would react to make H2O, leading to the position of the eq of the first eq to shift to the right, increasing the solubility of hydroxyapatite. 2 is also correct because from... -
Chemistry: Post your doubts here!
Here you need to know two concepts/formulas: mole fraction = number of moles of molecule A / total number of moles Partial pressure of A = mole fraction of A x total pressure If 20% of steam had been converted to hydrogen and oxygen, there must be 80% of steam left. So, if you before had 1... -
Need help with my grades
Well you said "any fields that requires strong chemistry knowledge are out from my choice". However if you are going to study science then i would definitely encourage you to retake your chemistry and maths. Plus, chemistry is a beautiful subject... if you get to understand it. -
Need help with my grades
Well, if you are going to do sciences at uni maths and chem are normally a must. I don´t know much about business but I think chemistry is not required, although maths might help. Look at some unis and the entry requirements. There is no need to study a hard subject if you dont like it/ find it... -
Need help with my grades
Well first you need to think what are you going to study at uni and what they ask for. I really can´t advice you much if I don´t know the course for which you are applying for. If you share this information I may me able to help you a bit. Normally it is better to take 3 A levels rather than 4... -
Need help with my grades
I´ve got a question. Given that you have a B in both maths and physics at AS level, what grade should you get at A2 in order to get an A overall? Say Maths is at 70 (just B) and physics at 75 (medium B). -
Chemistry: Post your doubts here!
For Q13: All of the ions in the question will have an electronic configuration similar to that of Ar. However, the only difference is the nuclear charge. The answer is A - P3- and the reason being it has the least nuclear charge which makes the electrons less attracted compared to the other... -
DOUBTS on Chemistry P12 (confusions)
What question you guys talking about? -
-
DOUBTS on Chemistry P12 (confusions)
I answered B, and think is B. Take a look at this, maybe it helps: http://en.wikipedia.org/wiki/Autocatalysis -
DOUBTS on Chemistry P12 (confusions)
Do you mean the graph of the autocalysed reaction? If you mean that I answered B. -
how was physics paper 12? (no discussions till 24 hours)
W Why can´t it be zero, I mean, the question asked what is the RESULTANT moment at the INSTANT when the rule is HORIZONTAL. -
DOUBTS on Chemistry P12 (confusions)
Talking about same question as you, I answered A :) -
how was physics paper 12? (no discussions till 24 hours)
Does anyone know what was the answer for the question of the ruler which rotated? The question was, if I remember right something like... At the instant when the rule is horizontal what is the resultant turning moment about the pivot? Thanks. -
DOUBTS on Chemistry P12 (confusions)
Equilibrium constants are constant at constant temperature, the question asked what would happen if you increase/decrease the temperature, hence the equlibrium constant changes, I think... -
Guyzz lotzz of Chemistry doubtzz plzz take a loke if u can help
Could you atleast indicate the year the questions are from please? -
Help Needed. Chemistry
Yes. I thought It wouldn´t react since there is no hydrogen adjacent to the carbon with the OH and so unsaturation wouldn´t be possible. Could you explain me question number 21, Paper 1, May/June 2010 Variant 2 please. Would really appreciate it. -
-
Chemistry: Post your doubts here!
Shielding effect plays a role in ionisation energies and therefore in reactivity. Shielding usually decreases the effective nuclear force, which makes the outermost electrons experience less of an attraction meaning the electron can be removed with more ease. Shielding effect increases as you go...