***May 2015 - Chemistry***

It was NH3 because N has a lone pair and whenever you see a lone pair it MUST be polar

The yellow one was sodium

what was the answer to the isotope question on the multiple choice

I skipped 1 and got like 2-5 wrong what do you guys think that will come out to

I skipped 1 and got like 2-5 wrong what do you guys think that will come out to

1: The question asked for a tripple bond so it had to be N2

2: The question asked for the polar molecule so it had to be NH3

3: The question asked for the 180 bond angle so it had to be CO2

4: Asked for ink, so it had to be chromatography

… the others in this set were (Salt-Water was distillation) and (Sand, Sugar was A which had to do with dissolving the Sugar)

An isotope must have the same number of protons

i think the isotope answer was B

What was the one with solid does conduct electricity, doesn’t conduct electricity as a solid, and something else

Most likely a 750+ (worst case scenario you have a 750) (Best case you have an 800)

What did you guys say for separating menthol from water

Isotope one I put Si

Ionic solids when placed in water will conduct electricty

what was the answer to the one about STP and 3/2 O2

what about the graph of ppercent of Ca in CaO vs. time?

was amorphous solids the one that lack definite something in the set of three questions about solids

Yes amorphous solids was the correct choice

it was methanol, so distillation

what was the delta h one for co2? was it like 1/2(delta 1 + delta h2)?

I thought it was A for the CO2 problem