[duharvalgt]

(Original post by LegendX)
So is HClO3. Chloric V acid?

1+Cl+(-2x3)=0
cl=5

[Man-Utd]

so how did everyone do in past papers...what were u averaging ?

[Converse girl]

(Original post by duharvalgt)
1+Cl+(-2x3)=0
cl=5

i dont understand????

[AlligatorSky]

(Original post by duharvalgt)
1+Cl+(-2x3)=0
cl=5

Robert Frost.

[King James]

(Original post by Man-Utd)
so how did everyone do in past papers...what were u averaging ?

Scraped an A in Jan 09 got a nice solid B in Jun 09 and a high C in Jan 11 - average high B, if I get this it will make my day since I got a U in the first attempt.

[Man-Utd]

(Original post by salma25)
i dont understand????

Na : +1
Cl : +5
O : -2 x 3 = -6
total: -6 + 1 + 5 = 0

remember the oxidation state of all the atoms MUST EQUAL THE OVERALL CHARGE...so if i had SO4 (2- charge) then the total of my oxidation numbers must equal -2 ....hope that helps

[eemooz]

(Original post by JoeLatics)
Same! Resitting F321 and F324, reresitting F322 (got 118 on 1st resit, but could improve that!) and obviously F325! Good luck, what do you need?

An A haha, but an A* would be wonderful
You??

[AlligatorSky]

(Original post by salma25)
i dont understand????

The Roman number inbetween tells the Oxidation number (of chlorine in this case)

Hydrogen is +1 and Oxygen is -2

Since there are 3 Oxygens, the charge becomes -6

So +1-6 = -5, Now chlorine needs to cancel the charge out, so it'll be a +5.

Thats why it has a (V) which means chlorines oxidation number is +5

[fletchdd02]

(Original post by Man-Utd)
so how did everyone do in past papers...what were u averaging ?

95% +

But that means nothing, I didn't get below 92% in my January mocks and then got a B in the actual exam

[duharvalgt]

(Original post by salma25)
i dont understand????

-5+cl=0

add 5 to both sides

cl=+5

[eemooz]

(Original post by Man-Utd)
so how did everyone do in past papers...what were u averaging ?

Only done two so far, Jan09 and Jun09
Got 48/60 in the first and 50/60 in jun09


If only all the papers contained so little on bond angles

What about you?

[Converse girl]

thanks
soo when it asks you to state the oxidation number NaClO it be and what about NaClO3?

[LegendX]

So what's the use if chloric v acid? Is it the same as chloric 1 acid? That it's used to kill bacteria and so why make chloric v acid?

[AlligatorSky]

Bye everyone,
and good luck too.

[Converse girl]

(Original post by AlligatorSky)
The Roman number inbetween tells the Oxidation number (of chlorine in this case)

Hydrogen is +1 and Oxygen is -2

Since there are 3 Oxygens, the charge becomes -6

So +1-6 = -5, Now chlorine needs to cancel the charge out, so it'll be a +5.

Thats why it has a (V) which means chlorines oxidation number is +5

(Original post by duharvalgt)
-5+cl=0

add 5 to both sides

cl=+5

thanks i get it now

[Man-Utd]

(Original post by salma25)
thanks
soo when it asks you to state the oxidation number NaClO it be and what about NaClO3?

NaClO3 would be +5 (V)
NaClO would be +1 (1)

[Holz888]

(Original post by LegendX)
U know what wkd be funny? If they tested the 'how w
Science works part' so by that I mean, when it asks about JJ Thomas and Mendeleev and the gang and stuff. I bet it'd be nsanely low grade boundaries then.

Haha I know you're joking, but don't worry! It said in the textbook that they won't ask you about theories and stuff! So glad, because I would fail that part.

(Original post by Man-Utd)
so how did everyone do in past papers...what were u averaging ?

Around 90% at the moment. The stupid thing is, it's all my mistakes are ridiculous - I know the information. My marked past papers have "READ THE QUESTION" scribbled all over in red ink by my angry dragon-like teacher. Like, one asked about metallic bonded, so I started chatting about ionic, yunno, because I'm cool like that. My goal for tomorrow is to read the question at least twice before answering :P

[Man-Utd]

(Original post by LegendX)
So what's the use if chloric v acid? Is it the same as chloric 1 acid? That it's used to kill bacteria and so why make chloric v acid?

dont worry...i dont think they'll ask you about the use of it ....just know that NaClO is used as a bleach andis formed when chlorine reacts with cold dilute alkalis to form NaCl + NaClO + H20

[Converse girl]

(Original post by Man-Utd)
NaClO3 would be +5 (V)
NaClO would be +1 (1)

so it depends on the chlorine charge.

[Man-Utd]

(Original post by Holz888)
Haha I know you're joking, but don't worry! It said in the textbook that they won't ask you about theories and stuff! So glad, because I would fail that part.



Around 90% at the moment. The stupid thing is, it's all my mistakes are ridiculous - I know the information. My marked past papers have "READ THE QUESTION" scribbled all over in red ink by my angry dragon-like teacher. Like, one asked about metallic bonded, so I started chatting about ionic, yunno, because I'm cool like that. My goal for tomorrow is to read the question at least twice before answering :P

YH I KNOW MAN SAME !!!!!!!!! loool i make silly mistakes too...