Hey, does anybody have to know whether we have to know about the individual observations about particular reactions of metals + water (so how potassium reacts and aluminum reacts) and how particular metals + acids react or do we just need to learn to general products created?
I'd suggest you learn the general formulae for the reactions, general observations and how the reactivity increases/decreases with different elements.
Hey, does anybody have to know whether we have to know about the individual observations about particular reactions of metals + water (so how potassium reacts and aluminum reacts) and how particular metals + acids react or do we just need to learn to general products created?
Know the general pattern - for most 'what can she observe' questions, effervescence is ALWAYS one of the answers unless the metal is less reactive than the acid and no displacement takes place.
for paper 1 , do you think we need to know about the more complex isomers e.g. 2,2, methylpropane? and if so how do you name them? i get the labelling of methyl groups but i just don't get the number in front of them?
for paper 1 , do you think we need to know about the more complex isomers e.g. 2,2, methylpropane? and if so how do you name them? i get the labelling of methyl groups but i just don't get the number in front of them?
The highest number I've ever seen to be asked to draw is drawing two isomers of butene. Anyway, after you've found the longest carbon chain and you've got the methyl, then you look at the position of the extra carbon(s) that aren't in that carbon chain. Starting from either side, you count all the carbons until you get to the one that the extra group(s) come(s) off. That's the number.
I'm a bit stuck on water of crystallisation could anyone please explain to me question 13)iii) on June 2012? It's a calculation and I just don't know how to do it! Thanks
I'm a bit stuck on water of crystallisation could anyone please explain to me question 13)iii) on June 2012? It's a calculation and I just don't know how to do it! Thanks
Hey I just did that same paper and basically all you have to do is use your answers from the previous question so for ZnSO4 you do 4.83\161 = 0.03 then you do the same for the water which comes up with 0.21 and then you find the ratio to its 1:7 and therefore 7 is the value of x. - hope that helps
Hey I just did that same paper and basically all you have to do is use your answers from the previous question so for ZnSO4 you do 4.83\161 = 0.03 then you do the same for the water which comes up with 0.21 and then you find the ratio to its 1:7 and therefore 7 is the value of x. - hope that helps
Please whenever anyone of you finishes the exam could you please write down some questions which appeared there? It would be really helpful as I'm no good in Chemistry. I've got my exam 20 hours from noww... quite nervous..
There is an embargo on edexcel exams, so UK students may not talk about the exam until 4:30AM on the day after the exam. You won't get any info from us :P