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## 2001 - Multiple Choice - Q14 Attention all lovely people =)

### Pammy

Posted 26 May 2006 - 02:37 PM

The answer is B. electrons in 1g of Hydrogen
can someone tell me why !!!???

### will_789

Posted 26 May 2006 - 02:39 PM

QUOTE(Pammy @ May 26 2006, 03:37 PM)

The answer is B. electrons in 1g of Hydrogen
can someone tell me why !!!???

Right, give me 5 mins and ill explain!

### Nathan

Posted 26 May 2006 - 02:40 PM

the only ones i can rule out are C&D because C is 2xavogado's as is D...A&B seem to give me the same answer :S

### will_789

Posted 26 May 2006 - 02:42 PM

QUOTE(nathanm @ May 26 2006, 03:40 PM)

the only ones i can rule out are C&D because C is 2xavogado's as is D...A&B seem to give me the same answer :S

ooo, soo close!!!
A is ruled out because the mass of one mole of oxygen is 32g, not 16!
O(small2)
Therefore there are 6.02x10^23 molecules in 32g, which isnt correct
Thats all you've done wrong.
Well done on the process of elimination

### Pammy

Posted 26 May 2006 - 02:44 PM

A is only half a mole of Oxygen so it's half of Avagadros
And that's what I thought about C, but how did you know D was 2x avagadro ??

### Nathan

Posted 26 May 2006 - 02:44 PM

QUOTE(will_789 @ May 26 2006, 03:42 PM)

O(small2)

you can do O [ s u b ]2[ / s u b] (no spaces) = O2

### will_789

Posted 26 May 2006 - 02:45 PM

QUOTE(Pammy @ May 26 2006, 03:44 PM)

A is only half a mole of Oxygen so it's half of Avagadros
And that's what I thought about C, but how did you know D was 2x avagadro ??

My Chemistry teacher told us something that it cant ever be ions...Im not quite sure tho...Could be wrong...lol

### Nathan

Posted 26 May 2006 - 02:46 PM

QUOTE
And that's what I thought about C, but how did you know D was 2x avagadro ??

Na+ + Cl- = 2moles ions = 2xavogadros

edit *i think*

### will_789

Posted 26 May 2006 - 02:52 PM

QUOTE(nathanm @ May 26 2006, 03:46 PM)

QUOTE
And that's what I thought about C, but how did you know D was 2x avagadro ??

Na+ + Cl- = 2moles ions = 2xavogadros

edit *i think*

Yeah well done, thats it.
Also, my chemistry teacher told us, if you cant work out the answer for these types, always guess the hydrogen if you cant completely eliminate it, as hydrogen is usually the answer

### Pammy

Posted 26 May 2006 - 02:59 PM

QUOTE(will_789 @ May 26 2006, 02:52 PM)

QUOTE(nathanm @ May 26 2006, 03:46 PM)

QUOTE
And that's what I thought about C, but how did you know D was 2x avagadro ??

Na+ + Cl- = 2moles ions = 2xavogadros

edit *i think*

Yeah well done, thats it.
Also, my chemistry teacher told us, if you cant work out the answer for these types, always guess the hydrogen if you cant completely eliminate it, as hydrogen is usually the answer

Pair of smarty pants !!
Thanx for the help !! much appreciated !!

Edit: omg look !!! I'm a site swot now !!!!!!!!! I think I am out of noobville now !!

### will_789

Posted 26 May 2006 - 03:00 PM

QUOTE(Pammy @ May 26 2006, 03:59 PM)

QUOTE(will_789 @ May 26 2006, 02:52 PM)

QUOTE(nathanm @ May 26 2006, 03:46 PM)

QUOTE
And that's what I thought about C, but how did you know D was 2x avagadro ??

Na+ + Cl- = 2moles ions = 2xavogadros

edit *i think*

Yeah well done, thats it.
Also, my chemistry teacher told us, if you cant work out the answer for these types, always guess the hydrogen if you cant completely eliminate it, as hydrogen is usually the answer

Pair of smarty pants !!
Thanx for the help !! much appreciated !!

Not a problem, Helping people is helping me!

### Nathan

Posted 26 May 2006 - 03:02 PM

QUOTE(will_789 @ May 26 2006, 04:00 PM)

Not a problem, Helping people is helping me!

that's my excuse for sitting here and chatting to peeps too

### will_789

Posted 26 May 2006 - 03:02 PM

QUOTE(nathanm @ May 26 2006, 04:02 PM)

QUOTE(will_789 @ May 26 2006, 04:00 PM)

Not a problem, Helping people is helping me!

that's my excuse for sitting here and chatting to peeps too

Yeah, doing past papers at the same time

### Pammy

Posted 26 May 2006 - 03:03 PM

QUOTE(nathanm @ May 26 2006, 03:02 PM)

QUOTE(will_789 @ May 26 2006, 04:00 PM)

Not a problem, Helping people is helping me!

that's my excuse for sitting here and chatting to peeps too

Hey nathan, you just blew my cover !!!!!!!!!!!! Well done !!

Edit: the "well done" is supposed to be in a sarcastic tone btw

### Nathan

Posted 26 May 2006 - 03:05 PM

QUOTE(Pammy @ May 26 2006, 04:03 PM)

Hey nathan, you just blew my cover !!!!!!!!!!!! Well done !!

Edit: the "well done" is supposed to be in a sarcastic tone btw

[sarcasm]i'm sorry[/sarcasm]

### Pammy

Posted 26 May 2006 - 03:06 PM

QUOTE(will_789 @ May 26 2006, 03:02 PM)

Yeah, doing past papers at the same time

Yes sure
nah I'm only kidding, I am doing that too, my mum says I should be a teacher coz I love to explain stuff to people and sit on this waiting for people to get stuck I know, I'm weird, but it's true

Edit: I agree with you will tho coz it does help me too (and makes me feel smart when I get it right )

### will_789

Posted 26 May 2006 - 03:07 PM

QUOTE(Pammy @ May 26 2006, 04:06 PM)

QUOTE(will_789 @ May 26 2006, 03:02 PM)

Yeah, doing past papers at the same time

Yes sure
nah I'm only kidding, I am doing that too, my mum says I should be a teacher coz I love to explain stuff to people and sit on this waiting for people to get stuck I know, I'm weird, but it's true

totally helps revision tho!!!

### Nathan

Posted 26 May 2006 - 03:07 PM

QUOTE(Pammy @ May 26 2006, 04:06 PM)

Yes sure
nah I'm only kidding, I am doing that too, my mum says I should be a teacher coz I love to explain stuff to people and sit on this waiting for people to get stuck I know, I'm weird, but it's true

That's what I;m doing too

### Pammy

Posted 26 May 2006 - 03:11 PM

[sarcasm] omg it's just like a big game of snap in here !!! [/sarcasm]

### Nathan

Posted 26 May 2006 - 03:27 PM

QUOTE(Pammy @ May 26 2006, 04:11 PM)

[sarcasm] omg it's just like a big game of snap in here !!! [/sarcasm]

***disclaimer***

the [sarcasm] and [/sarcasm] tags are copyright nathanm 2006

now leave it alone pammy

jus kiddin

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