m/c qs (2 Viewers)

[paper cup]

I'm asking this because I found these qs in 2001 papers; are they still relevant i.e. did the topics they cover survive the 2002 cuts?
edit: hold I've just realised I forgot to paste the other one. for coordinate covalent bonds, do we have to know any other examples other than ozone and ammonium?

 

[Captain Gh3y]

Is it just me or is there only one question in that document?

The syllabus doesn't say 'coordinate covalent bonds' anywhere other than for ozone. We still have to know how to write nuclear equations like in that question... although I might be confusing it with physics.

 

[paper cup]

Is it just me or is there only one question in that document?

The syllabus doesn't say 'coordinate covalent bonds' anywhere other than for ozone. We still have to know how to write nuclear equations like in that question... although I might be confusing it with physics.

I think it also deals with ammonium.
I mentioned that I forgot to paste; but that q is quite funny. I don't like it. I don't think there is a dot point on it :/ anyone confirm?

 

[Sepulchres]

I'm asking this because I found these qs in 2001 papers; are they still relevant i.e. did the topics they cover survive the 2002 cuts?
edit: hold I've just realised I forgot to paste the other one. for coordinate covalent bonds, do we have to know any other examples other than ozone and ammonium?

The hydronium ion is also an example of coordinate covalent bondage.

 

[paper cup]

The hydronium ion is also an example of coordinate covalent bondage.

no phosphate or anything though? P-O bonds or something. hold on let me go dig it up.

 

[Captain Gh3y]

I think it also deals with ammonium.
I mentioned that I forgot to paste; but that q is quite funny. I don't like it. I don't think there is a dot point on it :/ anyone confirm?

I noticed that in the 01 questions today; there seems to have been one on the steps of uranium --> lead decay that's no longer there.

Yep, we now only need to know nuclear reactions for "production of transuranic elements" and "production of commercially used isotopes'. They took out nuclear fission and the decay of uranium to lead.

 

[Dreamerish*~]

Describe the formation of a coordinate covalent bond.

It does not specify which compounds, but the common ones are ozone and ammonium, so know them. Ammonium appeared in our trial paper.

As for the nuclear chem question, the answer is D.

²³⁸₉₂U → ²³⁴₉₀Th → ²³⁴₉₁Pa → ²³⁴₉₂U

²³⁴₉₁Pa → ²³⁴₉₂U + ⁰_-1e

Beta decay.

 

[paper cup]

this is the q I missed :/ those things look unfamiliar

 

[Captain Gh3y]

"• describe the formation of a coordinate covalent bond
• demonstrate the formation of coordinate covalent bonds using Lewis electron dot structures"

I'd say that question hasn't been in the syllabus since "alchemy" was a topic.


• describe how transuranic elements are produced
• describe how commercial radioisotopes are produced

The nuclear reactions won't be the ones like that how it went X --> Y --> Z, they'll be something like W + X --> Y + Z.

 

[Dreamerish*~]

this is the q I missed :/ those things look unfamiliar

Nobody has answered this question yet, I'm quite sure the answer is d).

I'm not sure what the lines between the oxygen atoms in c) mean. Does anyone know?

Anyway, I've attached a Lewis dot diagram of phosphate, and since d) is not wrong and c) is confusing me with it's oxygen-oxygen lines, I'm going to put my money on d).

 

[lfc_reds2003]

dreamerish... spot on
cos it says "indicated by the arrows"
so by this logic it would sggest that sulfate has 2 coord cov bonds when in fact it only has one

 

[Dreamerish*~]

dreamerish... spot on
cos it says "indicated by the arrows"
so by this logic it would sggest that sulfate has 2 coord cov bonds when in fact it only has one

Really? Are you sure?

Sulfur has 6 electrons on it's outer shell, so it would make sense if it had two coordinate covalent bonds.

But as I said, I'm only going for d) on the grounds that it's correct regardless of whether or not c) is correct, and I'm not sure what those lines in c) mean.

 

[paper cup]

dreamerish the answers give it at D I just didn't get the funny things

 

[Dreamerish*~]

dreamerish the answers give it at D I just didn't get the funny things

Funny things being those lines between the oxygen atoms? Me neither.