Chemistry 9701 7th may ?

[Snowysangel]

you must have used exactly 79 and 81 instead of 78.92 and 80.92 given in the paper, that is wrong

Where was 78.92 and 80.92 given?

 

[Tulaib]

Where was 78.92 and 80.92 given?

it was written in I guess 2nd line of this Q

 

[Snowysangel]

it was written in I guess 2nd line of this Q

But there was just one line...they asked us to calculate the relative abundance of 81Br and 79Br...they even have the molar mass with the symbol

 

[Snowysangel]

I'm sorry I'm just freaking out for no reason. There's no point crying over spilt milk...lets just all hope for the best. Inshallah we will all get As

 

[Samina U]

When is the marking scheme going to come ?

 

[Princess Raven]

But there was just one line...they asked us to calculate the relative abundance of 81Br and 79Br...they even have the molar mass with the symbol

what did u get...

 

[Tulaib]

But there was just one line...they asked us to calculate the relative abundance of 81Br and 79Br...they even have the molar mass with the symbol

it was written in the main statement of the Q not of this part

 

[AbbbbY]

But there was just one line...they asked us to calculate the relative abundance of 81Br and 79Br...they even have the molar mass with the symbol

It said up in the question that Br 81 is 80.82 (or sth like that) and Br 79 78.82. Abundances were 49 51.

 

[aaaamfa]

My P was 2-methyl-hex-1-ene I think

And Q was pentan-1-one. Not sure about my answers really

I wrote 2,3-dimethylebut-2-ene for q

 

[Snowysangel]

Crap how many marks was the relative abundance question out of?

 

[Tulaib]

Crap how many marks was the relative abundance question out of?

3 marks

 

[Omar Haider]

X is equal to 2. I guess a bunch of people messed up the bond angles. Did you all know about PCl5?

 

[Aitch Dee]

The angles of PCl5 were 90 and 180 I think

 

[Aitch Dee]

And yeah I got x=2.

 

[Snowysangel]

90 and 120....still don't get how it was 2. What was the part if thr question before the deduction of x part

 

[AbbbbY]

The angles of PCl5 were 90 and 180 I think

Trigonal bi-pyramidal. 90 and 120.

 

[Omar Haider]

If you wrote the equation correctly, you would've easily gotten down to x=2. How about those other bond angle/shapes of Ethane and Ethene?

 

[AbbbbY]

If you wrote the equation correctly, you would've easily gotten down to x=2. How about those other bond angle/shapes of Ethane and Ethene?

Ethane is 109.5 (tetrahederal) and ethene 120 (trigonal planer)

 

[razahayat777]

x=2

6 tha

 

[Snowysangel]

Shouldnt ethane be a little less than 120 because of the double bond? I write 118...will they mark that correct? Also I wrote triOgonal bipyramidal...will I be penalized for that?