A Quick Worksheet Before heading into Unit 3 Chemistry

[jackson1234]

I have attached a simple question sheet that was provided to me for chemistry during transition. It basically encapsulates the simple things that you should be well and truly have knowledge over in unit 1 especially.

Good Luck class of 2011 Chemistry Students

[nacho]

Hey thanks, i'll def be needing this for my unit 1+2 revision over the next few days.

[Greatness]

Thanks do you have solutions?

[Andiio]

Thanks! Yeah, are there solutions to the Q?

[jackson1234]

Yeah ill post solutions soon, but they're going to be done by me. So if there are any mistakes or errors, just post them here. cheers guys

[Greatness]

oh ok then we should all do them and post answers

[chansthename]

I had a shot at it.

It has been way too long, sory but I didn't have a data book (for the periodic table, value of 0degC in K (-273?))

Anyway, here it is I'm not sold on my working though.

[Greatness]

I had a shot at it.

It has been way too long, sory but I didn't have a data book (for the periodic table, value of 0degC in K (-273?))

Anyway, here it is I'm not sold on my working though.

K= T in degrees + 273 so yeah what you said is correct, im doing these questions now almost done

[Greatness]

My answers:
a)i) 0.0381g
ii) C3N3O9H5
iii) same as a)ii)

b) 3.77 x 10^-22
c)i) 4C3N3O9H5 -> 12CO2(g) + 6N2(g) + 10H20(g) + O2(g)
ii) 1146kPa

not sure if these are right...

[Andiio]

Are we supposed to know the chem formula of glycerin? What other substances are we expected to know? e.g. glucose etc

[jackson1234]

Yeah no clue mate , but its unlikely that u would need to remember chem formulas especially the more complex ones like Glycerin. Its more a process of determining their molecular formulas through calculations eg mol ratios.

[Greatness]

well you can figure out molecular and empirical formulas if the question gives you info about mass, molar mass etc use mol ratios
i think they can give us questions in regard to solving for empirical or molecular formulas

[golden]

Question 1 b is not 227 g - the question stated molecule not mole.

[Greatness]

lol i was thinking that... is it 3.77 x 10^-22 seems like a weird answer :s

[golden]

lol i was thinking that... is it 3.77 x 10^-22 seems like a weird answer :s

If the answer is in grams that would be correct.