its challenging I would say but its better if you get these question right as the r paper has a mixture of these hard questions
Are you even sure that school's get delivered R papers along side non-R papers? I thought schools only got delivered papers that their candidates sit (I.e. they get sent the papers that the candidates sign up for) to avoid leaks and possible cheating. It would be logistically impossible to send all the colleges R papers in time for tomorrow's exam.
someone posted on twitter the paper as a picture having the paper obviously the cover but it was an hour before the exam so its too late to change the paper thn
They investigated and there was no evidence that it was actually leaked. Stop worrying about whether the paper was leaked anyway it makes no difference to you what paper we sit.
They investigated and there was no evidence that it was actually leaked. Stop worrying about whether the paper was leaked anyway it makes no difference to you what paper we sit.
Like ammonia, hydrazine is a base that reacts with water to form negative and positive ions. (we know hydrazine is H2N-NH2) i) Write the formula of the negative ion that is formed when hydrazine reacts with water ii) Suggest the formula of a positive ion which might form when hydrazine reacts with water
The answers are:- i) OH- ii) N2H5+ or N2H6+
Although I've got no idea how you would get these as your answers??
For the second part, as the hydrazine acts as a base, this means it is a proton acceptor (definition), so the N2H4 accepts a H+ ion to form N2H5+.
Not sure how to explain the first part, but the other ion in water is OH-, so I suppose that is what is left when the N2H4 accepts the H+? (sorry for terrible explanation)
Sorry, yes it is C. That question was very sneaky. I've learnt it as it being accelerated by an electric field. A magnetic field is used for deflection. Charged plates would act in the same way as an electric field
Sorry, yes it is C. That question was very sneaky. I've learnt it as it being accelerated by an electric field. A magnetic field is used for deflection. Charged plates would act in the same way as an electric field