F321 27th May 2016

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°

Remind me of qs and Ill give answers

No you dont, you were given the number of molecules of N2, you needed to find moles of N2 molecules

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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Ionic structure was 3 Ca2+ and 2 P3-. Oxygen was +2 oxidation number. I thought the bond angle was 180 and linear but that's probably wrong, how many marks was that question.

No you dont, you were given the number of molecules of N2, you needed to find moles of N2 molecules

Ionic structure was 3 Ca2+ and 2 P3-. Oxygen was +2 oxidation number. I thought the bond angle was 180 and linear but that's probably wrong, how many marks was that question.

I got linear and 180 too! Not sure if it was 1 or 2 marks tho. Gonna hope its right

I got linear and 180 too! Not sure if it was 1 or 2 marks tho. Gonna hope its right

I got linear and 180 too! Not sure if it was 1 or 2 marks tho. Gonna hope its right

it was 104.5, non-linear/bent 2 bonded pairs 2 lone pairs

it was 104.5, non-linear/bent 2 bonded pairs 2 lone pairs

guys, the oxidation state of oxygen was +2 in the oxygen fluoride, i put -2, funny things is they state in the book that we will not meet this in As level, are they gonna give us the mark or are they gonna just mark the correct one only?

part before did say flourine is the most electronegative, so you would expect it be the -ve one of two

part before did say flourine is the most electronegative, so you would expect it be the -ve one of two