Predictions for Chemistry 2014 HSC? (4 Viewers)

[zhertec]

Markers rather HBrO than the Br2 as it shows that you know bromine reacts with water.

 

[QZP]

nah I think you should use the other equation

"And what do you mean? They want structural diagram?"

 

[QZP]

Markers rather HBrO than the Br2 as it shows that you know bromine reacts with water.

It's fine. This discussion was on BoS a while ago. HBrO was old syllabus and then they allowed Br2(aq) and old teachers didnt adapt

 

[zhertec]

"And what do you mean? They want structural diagram?"

I think she means this: HBrO (aq) + C6H10(l) --> C6H10BrOH(aq) and yea I would also draw structural to clearly show it.

 

[SuchSmallHands]

View attachment 31193

how would you name this compound? And what's the thought process in doing so?

I'd name it 2,4-dibromo-1-chloro-2-methylbutane because it's easier to name than going with the other possible longest chain and I'm lazy and dumb haha
Edit: didn't see the fluorine there, add 1-fluoro in as well sorry

 

[zhertec]

View attachment 31193

how would you name this compound? And what's the thought process in doing so?

2-methyl, 2,4-dibromo, 1-chloro, 1-fluorobutane. Well that's how I would call it..lol

 

[enigma_1]

I'd name it 2,4-dibromo-1-chloro-2-methylbutane because it's easier to name than going with the other possible longest chain and I'm lazy and dumb haha
Edit: didn't see the fluorine there, add 1-fluoro in as well sorry

2-methyl, 2,4-dibromo, 1-chloro, 1-fluorobutane. Well that's how I would call it..lol

hmm there's a discrepancy? What logic do you use for it?

Normally you wouldn't start with the methyl group :/

 

[SuchSmallHands]

hmm there's a discrepancy? What logic do you use for it?

I used the alphabetical naming rule, which you should use

 

[enigma_1]

I used the alphabetical naming rule, which you should use

Ohh so that's what they want in hsc right? So it doesn't matter about electronegativity of the halogens or weird stuff like that?

 

[zhertec]

hmm there's a discrepancy? What logic do you use for it?

Normally you wouldn't start with the methyl group :/

I thought it was methyl before halogens in alphabetical order?

 

[seventhroot]

anyone need some last minute questions answered in chem?

I'm happy to help

 

[SuchSmallHands]

Ohh so that's what they want in hsc right? So it doesn't matter about electronegativity of the halogens or weird stuff like that?

Nope it's alphabetical. In 2012 they accidentally screwed it up themselves, and they'll definitely never do it again because it was a massive deal

 

[enigma_1]

I thought it was methyl before halogens in alphabetical order?

methyl is like the last thing, has the least precedence

 

[enigma_1]

Nope it's alphabetical. In 2012 they accidentally screwed it up themselves, and they'll definitely never do it again because it was a massive deal

yes omg that's what I was just looking at right now hahah. Thank gosh, cheers for that!

 

[zhertec]

Nope it's alphabetical. In 2012 they accidentally screwed it up themselves, and they'll definitely never do it again because it was a massive deal

Ok just checked it, yea you are right about the alphabetical thingy

 

[faisalabdul16]

Lets do some long response questions!

People ask

 

[seventhroot]

Lets do some long response questions!

People ask

What Is Chemistry (100 marks)

 

[enigma_1]

I'd name it 2,4-dibromo-1-chloro-2-methylbutane because it's easier to name than going with the other possible longest chain and I'm lazy and dumb haha
Edit: didn't see the fluorine there, add 1-fluoro in as well sorry

wait sorry just to confirm, why cant you start off with 1,3-dibromo etc? How do you get the 2,4 dibromo thing?

 

[enigma_1]

Lets do some long response questions!

People ask

Describe each of the layers of the atmosphere (4 marks)

 

[QZP]

wait sorry just to confirm, why cant you start off with 1,3-bromo etc? How do you get the 2,4 bromo thing?

When there are 2 possible molecular formulae for the same isomer, the one with least sum of numbers take preference