I thought bio went well, it was difficult, but I think I handled it alright.
ok, let me look at some past papers in my folder
'ICl has a higher boiling point than Cl2, explain in terms of intermolecular forces present, why ICl has a higher boiling point than Cl2.' 2 marks
describe a chemical test which a student could carry out to prove that the filtrate contains aqueous chloride ions. 2 marks.
hyrdrated copper II nitrate has the empirical formula CuN2O12H12 write the formula of hydrated copper nitrate to show its water of crystallisation.
1) ICL has more number of electrons and has greater intermolecular forces (van der waals forces) and therefore more energy needed to break intermolecular forces 2) Silver nitrate and if CL- present forms white ppt 3) Cu(No3)2 . 6H2O
1) ICL has more number of electrons and has greater intermolecular forces (van der waals forces) and therefore more energy needed to break intermolecular forces 2) Silver nitrate and if CL- present forms white ppt 3) Cu(No3)2 . 6H2O
great. in question 2, they can be picky and say AQUEOUS silver nitrate, but probably not for 2 marks.
Thanks for telling me i will be aware of that ok 1)How would you carry out a acid-base titration(3) 2) What colour does methylorange give in acid?
1) Have a conical flask containing an amount of alkali and add indicator. Then through a burette, introduce some acid with a known concentration until the indicator changes colour. Then work out how much acid required to neutralise. Then using stoichiometry, work out number of moles of alkali.
2) I don't remember... umm I'd guess at green? or blue? I'll say blue final answer
answer some of our questions, you'll do fine if you've been revising ok?
define relative atomic mass
describe how van der Waals forces arise
The mean weighted mass of an atom compared to 1/12th of a carbon-12 atom
Electrons are distributed unevenly in an atom. This creates temporary dipoles. These dipoles then induce dipoles on neighbouring molecules. Weak forces are formed between the two dipoles
1) Have a conical flask containing an amount of alkali and add indicator. Then through a burette, introduce some acid with a known concentration until the indicator changes colour. Then work out how much acid required to neutralise. Then using stoichiometry, work out number of moles of alkali.
2) I don't remember... umm I'd guess at green? or blue? I'll say blue final answer