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# F321 27th May 2016

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. (Original post by bigzman123)
Yup got those answers, what was the question where 8.5x10^-4 was the answer, i forgot
It was 5.117x10^20 atoms of something socu just divide by avogadros constant
2. (Original post by Hunnybeebee)
No oxidation

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For the decomposition reaction. It says It was redox

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3. (Original post by Hunnybeebee)
No oxidation

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I wrote disproportionation, it went from +3 to +2 and +4 im pretty sure
4. What was up with that long 5 marker as well?

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5. (Original post by Hunnybeebee)
No oxidation

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What was the reaction?
6. (Original post by SamH213)
I wrote disproportionation, it went from +3 to +2 and +4 im pretty sure
Oh no I crossed disproportionation out :'(

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7. (Original post by bigzman123)
Yesss, did you times the value by two
yeah!! to convert from molecules to atoms
8. (Original post by Rebeecccaahh)
wasn't the molecules or something equal to 5.117 x 10^20?? then divided by avo constant??
Then don't you divide by 2 because it was an Nitrogen molecule which is N2 and it asked for atoms?
9. (Original post by KaylaB)
Then don't you divide by 2 because it was an Nitrogen molecule which is N2 and it asked for atoms?
That's what I did. Divided by two first. Then divided by avagadros.

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10. (Original post by Rust Cohle)
What was the reaction?
It was disproportionation, mg was both oxidised and reduced
11. Seems I only lost one markers so fars so who wants to attempt the 5 marker haha

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12. How many marks were there for the Nitrigen dot cross
13. Was wondering what was everyone's views on the exam, because I'm trying to work out whether grade boundaries will be high or low? I personally was disappointed in the exam, found it harder then previous years and a lot more sneaky, so kind of feel like I want to cry. Also what did everyone get for the empirical formula for the acid?? (it was one of the first questions on the second page)
14. Was it chlorine water and bromine water or iodine water and bromine water?
15. (Original post by Dolphinflips)
Was wondering what was everyone's views on the exam, because I'm trying to work out whether grade boundaries will be high or low? I personally was disappointed in the exam, found it harder then previous years and a lot more sneaky, so kind of feel like I want to cry. Also what did everyone get for the empirical formula for the acid?? (it was one of the first questions on the second page)
It was nitric acid hno3, i thought it was pretty straightforward if im honest, probably the usual stupid mistakes though.
16. (Original post by Dolphinflips)
Was wondering what was everyone's views on the exam, because I'm trying to work out whether grade boundaries will be high or low? I personally was disappointed in the exam, found it harder then previous years and a lot more sneaky, so kind of feel like I want to cry. Also what did everyone get for the empirical formula for the acid?? (it was one of the first questions on the second page)
I got HNO3 for the acid. And I have a feeling it will be higher. From what I've heard, most people found it easy and everyone who did it is retakers. Btw did anyone else write sulphur fluoride instead of hexaflouride?

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17. Someone remind me of the questions not listed here cos I forgot some.

1. Seriously if you dont know protons neutrons and electrons relative mass charge and position, theres no hope.

S: Spherical
P: Dumbell

Relative energies I was unsure

Nitrogen dotcross had 3 crosses and 3 dots shared between the and one lone pair each.

No of moles of nitrogen atoms was 1.7 x10^-3

Remind me of others for q1

2. Remind me of q2

3. Ditto

4. Ditto

5. Ditto

6. Ditto

Unsure what question numbers:

Halide test question minimum no was 2 and it was bromine water plus the chloride and iodide, layer colour plus chloride was orange, plus iodide was purple

Mass of aluminium sulfate formed was 0.120 grams

Volume of gas produced was 1200 cm^3

Reason sodium has lower mp was because it has a higher ionic radius and lower charge.

Vdw comes about because of uneven electron diatribition causing instantaneous dipoles that induce dipoles in other atoms that causes them to be electrostatically attracted

Reason bromine has a higher bp was because it has more electrons so more likely to have uneven electron distribution.

Acid produced was Nitrous acid, HNO2

Calcium compound used to change soil pH would be hydroxide or oxide.

6Ca plus P4 goes to 2Ca3P2

Ionic structure was 3 Ca^2+ ions and 2 P^3- ions.

Oxygen was 2+ in oxygen difluoride.

2F2 + 2NaOH goes to F2O + 2NaF + H2O

Bond angle was 104.5°

Sulfur/Flourine compound was SF6, Sulfur Hexafluoride

Table question, Sodium has the lowest first ionisation, Silicon lowest forth, Neon lowest BP.

Remind me of qs and Ill give answers
18. (Original post by SamH213)
Was it chlorine water and bromine water or iodine water and bromine water?
Bromine water

equation Br2 + 2 I- --> I2 and 2Br- forms forms violet solution in cyclohexane
19. The acid was HNO2 because the equation wouldn't have balanced as HNO3
20. (Original post by SamH213)
Was it chlorine water and bromine water or iodine water and bromine water?
No chlorine water was present

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