[Rishika15]

For 2)a) I wrote: they are silvery metals, and they form a hydroxide in solution

Will I still get marks?

[Rishika15]

For 1)c) I put too expensive to run that temperature as alot of energy would be required.

And for 2)b) Newlands was not taken seriously as a scientist as he worked in a sugar factory, and he did not leave gaps for undiscovered atoms. Also, the law of octaves pattern broke down on the third row

4)b) weak acids contain more hydrogen atoms, so it will not ionise completely in solution, whereas strong acids have less hydrogen atoms, so they can ionise completely, and will have more hydrated protons than weak acids.


is this ok?

[Rishika15]

5)a)i) I put:Bubble the gas through limewater to test for carbon dioxide, and/or put a lit splint near the gas (to hear a pop) to test for hydrogen gas.

Last one!

What is question 5)b)ii ?

[ohsnapitsdana]

May I just ask, how do you know that these answers are the right ones? Is this linked to the real AQA mark scheme?

[whoopli]

(Original post by michelfish)
5a) iii) is no because in test 1 chloride ions where added in the form of aqueous hydrogen chloride (Hydrochloric acid)

H⁺ Cl^-

Yay someone who agrees with me even though I wrote no for wrong reason

[AngryBirds4]

(Original post by whoopli)
Yay someone who agrees with me even though I wrote no for wrong reason

Each test was performed separately, so the answer was yes. It even said that the hydrochloric acid dissolved the egg in the first one.

[James_01]

(Original post by AngryBirds4)
Each test was performed separately, so the answer was yes. It even said that the hydrochloric acid dissolved the egg in the first one.

no each test was carried out after test 1. It said from test one this experiment was carried out....

[AngryBirds4]

(Original post by James_01)
no each test was carried out after test 1. It said from test one this experiment was carried out....

Proof?


This was posted from The Student Room's iPhone/iPad App

[Jarred Kyle]

(Original post by AngryBirds4)
Proof?

The proof is on the exam paper. It clearly said that tests 2, 3 and 4 were carried out following test 1.

[Math12345]

(Original post by Jarred Kyle)
The proof is on the exam paper. It clearly said that tests 2, 3 and 4 were carried out following test 1.

This is correct. I saw Test 1 in bold each time.

[Fas]

lol i never actually read all the stuff at the top haha

[Jigglypuff786]

(Original post by NA951)
Omg, I put the -810 kJ/mol then I scribbled out the - last minute, ANNOYED.com

Lol on the mark scheme it says "Ignore (-) symbol" so it doesn't matter

[Jigglypuff786]

(Original post by letsbehonest)
I need to get 84 for an A*

So I lost marks on carbonate test - I just said CO2 is given off when HCL is added. So two marks gone.

Messed the bond energy one up somehow - so minus 3 marks max.

For 7b I just said the temp increased because its an exothermic reaction, bonds are being made What the hell was the question for that? So lost another two marks?

7 marks gone so far, so lets say another 1 or 2 if ms is really harsh.

probably 35/36/37/38 - 39 is pushing it.

What do you reckon for 100ums?
37ish?

39 Marks would be 100

[Jigglypuff786]

(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?

hey, take a hb pencil and shove it directly up your rectum.

[Welbeck]

anyone know when the grade boundaries will be released for the exam?

[Lash]

(Original post by Welbeck)
anyone know when the grade boundaries will be released for the exam?

The morning of results day, always like that, never earlier.

[Welbeck]

(Original post by Lash)
The morning of results day, always like that, never earlier.

Will wake up at around 6am to check those, because then I would know if i got an A* in chem pretty much :/

[Maat]

Or just check at 00:01, that's what I did for January results

[Diet coke]

You know everyone is asking about getting 100ums , does anyome actually need 100 for an A*?

[tinkerbell1109]

(Original post by Maat)
Or just check at 00:01, that's what I did for January results

I never knew you could do that lol. Thanks