I did:

60cm3 = 0.06dm3
0.06dm3 x 12.5 = 0.75dm3
0.75/21 x 100 = 3.57dm3

May be completely wrong, but it seemed like the logical thing to do at that moment in time...

Overall, an awful paper :'(

Reply 88

hannah1994

7

Original post by AGrumpyMole

I know haha :smile:

I got 3.57 dm3, though :/

I got that :smile:

do you reckon anyone will put a mark scheme up?

Reply 89

megank

5

Original post by Reina

I did:

60cm3 = 0.06dm3
0.06dm3 x 12.5 = 0.75dm3
0.75/21 x 100 = 3.57dm3

May be completely wrong, but it seemed like the logical thing to do at that moment in time...

Overall, an awful paper :'(

YAY!!! thats exactly what i did too... hope its right :biggrin:

Reply 90

AGrumpyMole

11

Original post by megank

YAY!!! thats exactly what i did too... hope its right :biggrin:

AOOWWW MMMYYYY GGOOOWWWWWDDDDDDD. Niice.

Reply 91

megank

5

Original post by AGrumpyMole

AOOWWW MMMYYYY GGOOOWWWWWDDDDDDD. Niice.

I know haha! but to be fair i thought this paper was much harder than the january 12 one.. :frown:

argh why didnt i do better in that one :frown:

Reply 92

matty b

Original post by AGrumpyMole

What was the answer to the volume of air question?

Something along the lines of 3.57. 21% of that was the volume of 0₂, thats how i checked.

How did we draw the ionic bond? Did the Na have 8 electrons in the outer shell, or none?

In other words, was it like this:

or like this:

Reply 93

TheToothFairy :)

1

That was a horrible paper, I did the one in Jan as well and that was so much easier, I'm so annoyed with myself that I didn't do better in that one! :frown:

Reply 94

megank

5

Original post by matty b

Something along the lines of 3.57. 21% of that was the volume of 0₂, thats how i checked.

How did we draw the ionic bond? Did the Na have 8 electrons in the outer shell, or none?

In other words, was it like this:

or like this:

Either one is correct....

Reply 95

billybobs

5

Original post by matty b

Something along the lines of 3.57. 21% of that was the volume of 0₂, thats how i checked.

How did we draw the ionic bond? Did the Na have 8 electrons in the outer shell, or none?

In other words, was it like this:

or like this:

I think the top one is "chemically correct" because it is the outermost shell which has lost the electron - the shell still exists even with no electrons, but I reckon you could get away with both

Reply 96

tasniaa

Original post by Reina

I did:

60cm3 = 0.06dm3
0.06dm3 x 12.5 = 0.75dm3
0.75/21 x 100 = 3.57dm3

May be completely wrong, but it seemed like the logical thing to do at that moment in time...

Overall, an awful paper :'(

that sounds about right.
I completely failed that question. :frown:

Other than that everything was okay?

Reply 97

megank

5

Original post by TheToothFairy :)

That was a horrible paper, I did the one in Jan as well and that was so much easier, I'm so annoyed with myself that I didn't do better in that one! :frown:

same!! i made so many careless mistakes back then :frown:

Reply 98

billybobs

5

That paper was beautiful, only disruptive question was 4c about the melting points of arsenic and gallium, but I worked it out in the end :biggrin:

Reply 99

Reina

8

Original post by matty b

Something along the lines of 3.57. 21% of that was the volume of 0₂, thats how i checked.

How did we draw the ionic bond? Did the Na have 8 electrons in the outer shell, or none?

In other words, was it like this:

or like this:

I put the second one...but it might not really matter which one you draw as long as you show the eight on the outer shell of Na are all from the same atom?

What did everyone get of the empirical formula?

AS OCR chemistry B (SALTERS) F331 on the 15th may 2012

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