[Fas]

(Original post by bobe25)
How do u know?

i dont, im predicting that based on difficulty of paper and the fact it was a June series so boundaries are always lower in June

[Fas]

(Original post by Frankster)
It's mass spectrometry.

spectroscopy, spectrometry - these are the words the mark scheme credits, ive done that same question on past papers

[hayhayhay1]

any grade boundaries ???

[AdamskiUK]

I don't think any Chem boundary has ever been 35 for an A* - ever. There's an online calculator you can check.

I need 90 UMS for an A*, but I ballsed up the exam so I think I only got between 33-35 marks. If I don't get an A* overall, it will be because of a difference of about 2 UMS on this paper

Not fretting though. As pointed out before, TSR is filled with the elitists (me in some subjects). They all want high grade boundaries because they easily got the marks I thought I got 70/100 on my Maths module last year thanks to TSR, ended up with 89/100.

Don't go through and worry, you don't know how the examiners will mark this and how the boundaries will fall.

[Zigggyy.]

(Original post by AdamskiUK)
I don't think any Chem boundary has ever been 35 for an A* - ever. There's an online calculator you can check.

I need 90 UMS for an A*, but I ballsed up the exam so I think I only got between 33-35 marks. If I don't get an A* overall, it will be because of a difference of about 2 UMS on this paper

Not fretting though. As pointed out before, TSR is filled with the elitists (me in some subjects). They all want high grade boundaries because they easily got the marks I thought I got 70/100 on my Maths module last year thanks to TSR, ended up with 89/100.

Don't go through and worry, you don't know how the examiners will mark this and how the boundaries will fall.

That made me feel a lot better, ahaha.


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[Jigglypuff786]

(Original post by AdamskiUK)
I don't think any Chem boundary has ever been 35 for an A* - ever. There's an online calculator you can check.

I need 90 UMS for an A*, but I ballsed up the exam so I think I only got between 33-35 marks. If I don't get an A* overall, it will be because of a difference of about 2 UMS on this paper

Not fretting though. As pointed out before, TSR is filled with the elitists (me in some subjects). They all want high grade boundaries because they easily got the marks I thought I got 70/100 on my Maths module last year thanks to TSR, ended up with 89/100.

Don't go through and worry, you don't know how the examiners will mark this and how the boundaries will fall.

Uhh January 2011 was 35 for an A*...

[tigerz]

(Original post by Jigglypuff786)
Uhh January 2011 was 35 for an A*...

haha I was just about to say that! BUT, that was only once, and January UMS boundaries are usually higher than June so no worries! Athough in C3 100 UMS is usually about 37ish

First I was worried because it was easy, but considering the past papers, they were even easier so I don't think the UMS will be 35 for an A* (39 for 100)

[Aarongreatbanks]

here's my full answers, let me know what you think- i am sorry but i want a second opinion for reliablity- i am really sorry honest, im just worried. One marking and no more of me

1a) the water is hard because it contains magnesium ions. When sodium carbonate is added it reacts with the magnesium sulphate to form a precipiate of magnesium carbonate. Because the magnesium is removed from the water it's soft and the and the sdoium ions displace the magensium ions (3)
b) result is anomalous(1)
ii) 68 degrees c (1)
iii) because the water would evaporate at 100c (1)
c) because it isn't a curve and as the temperature increases the solubility doesn't always increase. Also, the solbuility increases to 68 c and then falls when it should continue going up (2)
2 a) they are metals and they all have one electron in their outer shell (2)
b) he put two elements in same box more than one for example he put di and mo in the same box. Also, it wasn't accepted as he put metals and non metals in the same group, for example he put gold and oxygen in the same group and also he put elements in groups with elements that they don't react similarly to for example he put copper and lithium in the same groups(3)
c) he considered undiscovered elements and left gaps for them so that they could easilly fit into his period table (2)
3 a) transition metals are strong,malleable and don't corrode easily (2)
b) the electrons of transition metals fill up the 3rd enegry level after there are two in the 4th shell, meaning that they usually have the same number of electrons in their outer energy level, making them have similar properties (2)
4 a) h+(1)
b) ph of weak acid higher and the ph of a strong acid is lower as it's fully ionised in water so there is more hydrogen ions in solution so they have lower ph (2)
c) 0.61 mol/dm3 (3)
ii) 12g (2)
5 a) i) bubble gas through limewater and limewater should go cloudy (2)
ii) wrong, as ammonia gas did not form when sodium hydroxide was added (2)
iii) right , as white precipitate formed after silver nitrate added (2)
b) i) atom absorption spectroscopy (1)
ii) measure smaller amounts (1)
6. Chlorine atoms are smaller so the electrons in the outer energy level are closer to the postive nucleus, so they are more strong sttracted to the positive nucleus. Also, in chlorine, the electrons are less sheilded from the positive charge on the nucleus so they are ore strongly attracted to the positive nucleus. Because of this there are more strongly attractied to the nucleus so any electron that would be added to the outer energy less is gained more easily (3)
7 a) -810 kj/mol (3)
b) because the energy released from new bonds forming is more than the enrgy required to break the existing bonds(1)
c) because it provides the activation energy (1)

i think i got 36/45 :/

i think i dropped marks here

iii) because the water would evaporate at 100c (1)-lose 1
c)because it isn't a curve and as the temperature increases the solubility doesn't always increase. Also, the solbuility increases to 68 c and then falls when it should continue going up (2)-lose 1
3 a) transition metals are strong,malleable and don't corrode easily (2)-lose 1
ii) wrong, as ammonia gas did not form when sodium hydroxide was added (2)-lose 2
iii) right , as white precipitate formed after silver nitrate added (2)-lose 2
b) i) atom absorption spectroscopy (1)-lose 1 as i mispelt it
ii) measure smaller amounts (1)-lose 1

can you see where i've dropped or gained marks compared to what i've put please?

[Frankster]

(Original post by Aarongreatbanks)
b) i) atom absorption spectroscopy (1)-lose 1 as i mispelt it

can you see where i've dropped or gained marks compared to what i've put please?

You won't lose a mark there, from experience I can say that.

[Aarongreatbanks]

(Original post by Frankster)
You won't lose a mark there, from experience I can say that.

Thankyou mate

[Maat]

i put atom spectroscopy, will i get the mark?

[Fas]

(Original post by Maat)
i put atom spectroscopy, will i get the mark?

yeah 'spectroscopy' is what they look for and 'spectrometry'

[zoologist7]

(Original post by Aarongreatbanks)
here's my full answers, let me know what you think- i am sorry but i want a second opinion for reliablity- i am really sorry honest, im just worried. One marking and no more of me

1a) the water is hard because it contains magnesium ions. When sodium carbonate is added it reacts with the magnesium sulphate to form a precipiate of magnesium carbonate. Because the magnesium is removed from the water it's soft and the and the sdoium ions displace the magensium ions (3)
b) result is anomalous(1)
ii) 68 degrees c (1)
iii) because the water would evaporate at 100c (1)
c) because it isn't a curve and as the temperature increases the solubility doesn't always increase. Also, the solbuility increases to 68 c and then falls when it should continue going up (2)
2 a) they are metals and they all have one electron in their outer shell (2)
b) he put two elements in same box more than one for example he put di and mo in the same box. Also, it wasn't accepted as he put metals and non metals in the same group, for example he put gold and oxygen in the same group and also he put elements in groups with elements that they don't react similarly to for example he put copper and lithium in the same groups(3)
c) he considered undiscovered elements and left gaps for them so that they could easilly fit into his period table (2)
3 a) transition metals are strong,malleable and don't corrode easily (2)
b) the electrons of transition metals fill up the 3rd enegry level after there are two in the 4th shell, meaning that they usually have the same number of electrons in their outer energy level, making them have similar properties (2)
4 a) h+(1)
b) ph of weak acid higher and the ph of a strong acid is lower as it's fully ionised in water so there is more hydrogen ions in solution so they have lower ph (2)
c) 0.61 mol/dm3 (3)
ii) 12g (2)
5 a) i) bubble gas through limewater and limewater should go cloudy (2)
ii) wrong, as ammonia gas did not form when sodium hydroxide was added (2)
iii) right , as white precipitate formed after silver nitrate added (2)
b) i) atom absorption spectroscopy (1)
ii) measure smaller amounts (1)
6. Chlorine atoms are smaller so the electrons in the outer energy level are closer to the postive nucleus, so they are more strong sttracted to the positive nucleus. Also, in chlorine, the electrons are less sheilded from the positive charge on the nucleus so they are ore strongly attracted to the positive nucleus. Because of this there are more strongly attractied to the nucleus so any electron that would be added to the outer energy less is gained more easily (3)
7 a) -810 kj/mol (3)
b) because the energy released from new bonds forming is more than the enrgy required to break the existing bonds(1)
c) because it provides the activation energy (1)

i think i got 36/45 :/

i think i dropped marks here

iii) because the water would evaporate at 100c (1)-lose 1
c)because it isn't a curve and as the temperature increases the solubility doesn't always increase. Also, the solbuility increases to 68 c and then falls when it should continue going up (2)-lose 1
3 a) transition metals are strong,malleable and don't corrode easily (2)-lose 1
ii) wrong, as ammonia gas did not form when sodium hydroxide was added (2)-lose 2
iii) right , as white precipitate formed after silver nitrate added (2)-lose 2
b) i) atom absorption spectroscopy (1)-lose 1 as i mispelt it
ii) measure smaller amounts (1)-lose 1

can you see where i've dropped or gained marks compared to what i've put please?

No one here can mark your answers accuratly, only the examiner can.
So you will only find out your real marks on results day, answers given here are never exact.
So stop worrying and please do not post the same thing over and over again as it just annoying.
From what I can see you did very well.

[ThomSDK]

(Original post by champions_2012)
1a) Magnesium ions from the dissolved magnesium sulfate make the water hard (1). When sodium carbonate is added the magnesium ions from magnesium carbonate (1) which is a solid precipitate taking the magnesium ions out of the solution (1).
b) Result is anomalous/ doesn’t fit general pattern (1)
c) Water would boil off and there would no longer be 100g (1)
ii) 68 degrees C (1)
c) Two straight lines (1) which join at a peak (1) (as opposed to curve)
2 a) They are metals (1), react strongly with water (1)
b) Two elements in same box (1), some elements in same group had different properties (1), pattern falls apart after 18 elements (1) etc.
c) Left gaps (1) so undiscovered elements could be put into the table when they are discovered (1)
3 a) Transition metals unreactive compared to other metals (1) hard (1) shiny (1) (Max 2)
b) All have similar/same number of outer shell electrons (1) but 3rd shell only partly filled (1)
4 a) Hydrogen ion (1)
b) pH of weak acid higher (1) as less hydrogen ions in same concentration (which cause acidity in solution) (1)
c) i) Strong alkali, weak acid (1)
c) ii) 0.61 mol/dm3 (3)
ii) 12g (2)
5 a) i) Bubble gas through limewater (1) and limewater should go cloudy (1)
ii) Wrong (1), as white precipitate did not dissolve again when excess sodium hydroxide added (1)
iii) Right (1), as white precipitate formed after silver nitrate added (1)
b) i) Atomic Absorption Spectroscopy (1), Mass spectrometry (1) (Max 1)
ii) Measure smaller changes in the amount of lead (1)
6. Chlorine atoms smaller (1), so higher force of attraction between outer shell electrons and nucleus (1), so electrons gained more easily when they react (1)
7 a) -810 kJ/mol (3)
b) More energy released by bond making (1) than used for bond breaking (1)
c) Spark provides activation energy (1)

I got all of those except 7c! I said fire requires: fuel, oxygen and heat so therefore the heat from the match is required before methane can burn. darn completely forgot about activation energy


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[Medical-al]

Does anyone have the paper for this exam?

[Maat]

for the question about properties of group 1 elements i put
they are all alkali
they all have the same number of electrons on there outermost shell
2 marks?

[Singhy123]

Was this mark scheme for the AQA paper and does anyone have the paper for this exam

[moolia29]

someone please explain 4 (c) (ii)!!!! i literally have no idea how to do it and i have the worst teacher in the world!!!