CSSA chemistry (3 Viewers)

[RANK 1]

Re: CSSA Chemistry 2011

that was just simple ratios

 

[Dylanamali]

Re: CSSA Chemistry 2011

q4 was a calculation question, regarding ethylene being reacted with bromine. Do you remember what your answer was?
I'm preety sure you had to work out which one was not in excess then do molar ratio.s

Another question was what was the geiger counter used for? What is the answer....? There was no simple - detecting radiation

Also do you remember the question regarding the adding of HCl to BaOH, and the pH of the resultant solution. Do you remember your answer?

 

[Riproot]

What were your answers to these MCs?
q4 was a calculation question, regarding ethylene being reacted with bromine. Do you remember what your answer was?
I'm preety sure you had to work out which one was not in excess then do molar ratio.s
Another question was what was the geiger counter used for? What is the answer....? There was no simple - detecting radiation
Also do you remember the question regarding the adding of HCl to BaOH, and the pH of the resultant solution. Do you remember your answer?

Answers were A, C and I guessed the third one.

 

[Dylanamali]

Answers were A, C and I guessed the third one.

Yes I got A

What was C for the geiger counter question - wasn't that like treating cancerous patients? How could a geiger counter treat cancerous patients?

And the third one I calculated my answer e.g. found the no. mols of each, found the excess, then found the conc.. and my answer wasn't on the list, ended up just doing the closest one which was A

 

[RANK 1]

Re: CSSA Chemistry 2011

the bromine one was because of the uv light. which acts as a catalyst for the alkane to react with the bromine water

the geiger counter was for the detection of cracks in metal, i think, cos you use cobalt-60 to detect cracks in metal.

the hcl to BaOH was 1.86

 

[Dylanamali]

Re: CSSA Chemistry 2011

the bromine one was because of the uv light. which acts as a catalyst for the alkane to react with the bromine water

the geiger counter was for the detection of cracks in metal, i think, cos you use cobalt-60 to detect cracks in metal.

the hcl to BaOH was 1.86

how did you get 1.86??

 

[umz93]

Re: CSSA Chemistry 2011

It was an alright test. Multiple choice killed my life. What was the answer to the first multiple choice question lol.

 

[Riproot]

What was C for the geiger counter question - wasn't that like treating cancerous patients? How could a geiger counter treat cancerous patients?

And the third one I ended up guessing A

oh yeah fuck it was D. It deffs wasn't A, B or C coz they didn't make sense. I just forgot which was which.

Yeah I think I guesses B

 

[RANK 1]

Re: CSSA Chemistry 2011

how did you get 1.86??

tell me the question again i just remember i got 1.86

 

[RANK 1]

Re: CSSA Chemistry 2011

how did u guys do the lewis dot diagram for CO, cos apparently it has a triple bond, 2 covalents and 1 coordinate covalent

 

[imZerroo]

Re: CSSA Chemistry 2011

how did u guys do the lewis dot diagram for CO, cos apparently it has a triple bond, 2 covalents and 1 coordinate covalent

Umm it's got a double covalent and a single co ordinate covalent (oxygens)

 

[Riproot]

how did u guys do the lewis dot diagram for CO, cos apparently it has a triple bond, 2 covalents and 1 coordinate covalent

Wtf? No.
O can be satisfied by an octet of electrons and C can be satisfied by quartet, right?

 

[Dylanamali]

Re: CSSA Chemistry 2011

Wtf? No.
O can be satisfied by an octet of electrons and C can be satisfied by quartet, right?

RANK 1 is correct- I f'ed that up aswell..

Looks like I'm probably heading around 80%+ =/

 

[Dylanamali]

Re: CSSA Chemistry 2011

It was an alright test. Multiple choice killed my life. What was the answer to the first multiple choice question lol.

Umm ethlyene is mainly obtained by cracking alkanes?

 

[Hermes1]

Re: CSSA Chemistry 2011

Guys i have my chem trial on tuesday and ive done no work whatsoever. what would be my best method of cramming from here, just memorise my notes or do past papers?

 

[umz93]

Re: CSSA Chemistry 2011

Umm ethlyene is mainly obtained by cracking alkanes?

Yes thats what i put! alot of kids in my school said it was by fractions of crude oil...

 

[umz93]

Re: CSSA Chemistry 2011

Guys i have my chem trial on tuesday and ive done no work whatsoever. what would be my best method of cramming from here, just memorise my notes or do past papers?

Do past papers
Before my half yearlies all i did was notes and i went bad. Before these trials i did alot of past papers and it worked wonders!

 

[Riproot]

RANK 1 is correct- I f'ed that up aswell..
Looks like I'm probably heading around 80%+ =/

FUCK!!!
I'm looking at 40-50 tbqh. I feel like I should kill myself but then remember I have 12 units.

 

[Dylanamali]

Re: CSSA Chemistry 2011

Do past papers
Before my half yearlies all i did was notes and i went bad. Before these trials i did alot of past papers and it worked wonders!

umz, how did you go? sounds like you went well...

I found it quite challenging..

What was your answer for the HCl being added to BaOH and the resulting pH of the solution.

Also what was the answer of what is the use of the Geiger counter.

And just a checking thing: in MCs there was a question comparing sulfuric acid and HCl - my answer was they have the same H+ and the same pH. Is that what you got?

 

[Riproot]

Yes thats what i put! alot of kids in my school said it was by fractions of crude oil...

lol no. Because you can't get it straight from crude oil.