Covalent bonds (1 Viewer)

[kazemagic]

In question 4, why are the covalent bonds charged? I looked through prelim conquering chem and I cant find anything that talks about this. Can someone tell me what topic is that, so i can study it

http://i.imgur.com/ytBTx.jpg
Thanks

 

[RealiseNothing]

I think it's in the water topic, although I'm not 100% sure.

 

[theind1996]

Some of them are charged because of hydrogen bonds due to differences in polarity - this is from topic 3, water so don't fret over it.

And PM me if you want something better for revision than that trash Conquering Chem for Year 11

 

[kazemagic]

I think it's in the water topic, although I'm not 100% sure.

Some of them are charged because of hydrogen bonds due to differences in polarity - this is from topic 3, water so don't fret over it.

And PM me if you want something better for revision than that trash Conquering Chem for Year 11

Thanks guys

 

[HSC2014]

Uhm - they are all polyatomic ions, a bunch of atoms bonded together chemically to act as a single ion. I don't think polarity has anything to do with the answer here.
The answer lies within how the Lewis Dot Diagrams are drawn.
i. Oxygen is missing its other 6 electrons
ii. Im supposing this one is correct, but I learnt to do :c:::n: not the vertical thing. Someone clarify?
iii. Wrong number of electrons on the atoms..
iv. Hydrogen does not have that many electrons.

 

[RealiseNothing]

ii. Im supposing this one is correct, but I learnt to do :c:::n: not the vertical thing. Someone clarify?

As far as I know, both ways are correct. But I prefer to use the vertical method.

 

[kazemagic]

Uhm - they are all polyatomic ions, a bunch of atoms bonded together chemically to act as a single ion. I don't think polarity has anything to do with the answer here.
The answer lies within how the Lewis Dot Diagrams are drawn.
i. Oxygen is missing its other 6 electrons
ii. Im supposing this one is correct, but I learnt to do :c:::n: not the vertical thing. Someone clarify?
iii. Wrong number of electrons on the atoms..
iv. Hydrogen does not have that many electrons.

ohh alrite thx

 

[kazemagic]

Alright another question D:
So for question b) I know its a triagonal pyramidal, but I don't know why its a triagonal pyramidal :O
http://i.imgur.com/avXap.jpg
Thanks

 

[BlugyBlug]

Alright another question D:
So for question b) I know its a triagonal pyramidal, but I don't know why its a triagonal pyramidal :O
http://i.imgur.com/avXap.jpg
Thanks

there is a lone electron pair at the top of the pyramid.
this lone electron pair repels the hydrogen atoms from that point at the top of the pyramid. result: hydrogen atoms move to the bottom of the N atom, as they are repelled by an electron pair at the top.

 

[theind1996]

Alright another question D:
So for question b) I know its a triagonal pyramidal, but I don't know why its a triagonal pyramidal :O
http://i.imgur.com/avXap.jpg
Thanks

Ammonia has 4 electron pairs right? 1 at the top, 1 left, 1 right, 1 bottom.

However, it only has 3 bonding pairs since 1 of the electron pairs is unbonded.

The unbonded electron pair repels the bonding electron pairs causing them to bend down.

That's why it looks like a trigonal pyramid (aka Siddy 123's house).

Ah damn it got beaten by BlugyBlug.

 

[kazemagic]

there is a lone electron pair at the top of the pyramid.
this lone electron pair repels the hydrogen atoms from that point at the top of the pyramid. result: hydrogen atoms move to the bottom of the N atom, as they are repelled by an electron pair at the top.

Ammonia has 4 electron pairs right? 1 at the top, 1 left, 1 right, 1 bottom.

However, it only has 3 bonding pairs since 1 of the electron pairs is unbonded.

The unbonded electron pair repels the bonding electron pairs causing them to bend down.

That's why it looks like a trigonal pyramid (aka Siddy 123's house).

Ah damn it got beaten by BlugyBlug.

ohh alright thanks guys

 

[HSC2014]

Are you self learning the content?

 

[kazemagic]

Are you self teaching yourself? o_o

yea pretty much, my chem and phys tutor goes too fast for me, which just leaves me confused. So i have to self study to build a stronger foundation so i will actually understand what my tutor is talking about lol not a pleasant process =.=

 

[theind1996]

yea pretty much, my chem and phys tutor goes too fast for me, which just leaves me confused. So i have to self study to build a stronger foundation so i will actually understand what my tutor is talking about lol not a pleasant process =.=

Perhaps you should get another tutor? lol...

 

[kazemagic]

Perhaps you should get another tutor? lol...

dont kno any others :/ and i think the problem is with me cos my foundations sucked thanks to my science teacher =.=

 

[Aysce]

You're already doing water, Kazemagic?

 

[nifkeh]

dont kno any others :/ and i think the problem is with me cos my foundations sucked thanks to my science teacher =.=

if you're doing water already that's way too fast, especially if you haven't mastered the first topic and metals well enough. I did water in tutor in term 2 and even at that point, isn't at a disadvantage

 

[Aysce]

if you're doing water already that's way too fast, especially if you haven't mastered the first topic and metals well enough. I did water in tutor in term 2 and even at that point, isn't at a disadvantage

He hasn't completed metals yet.

 

[kazemagic]

if you're doing water already that's way too fast, especially if you haven't mastered the first topic and metals well enough. I did water in tutor in term 2 and even at that point, isn't at a disadvantage

dw i already decided to basement this holiday

 

[HSC2014]

Well the first two modules don't really have that much of an impact on the third (water). I don't think it will be much of an issue.