Post by: khalil on December 04, 2008, 12:51:27 pm
Te is heavier than I, yet it is placed before I in the periodic table. Why?
115L of gas at 455mmHg is heated from 22 degrees to 350K. what is the new pressure?
A car burns 45L of fuel (75% octane and 25% nonane) in a week. What volume of CO(2) does this result in, at SLC.
there is more to come....if u can answer these u are a genius and should become my tutor :)
Post by: shinny on December 04, 2008, 01:38:01 pm
Second question:
The volume and mol of gas are remaining constant, so use the following formula:
Third question: First write the two combustion equations.
Because there is 45L of fuel, and three quarters is octane, then that means 33.75 L is octane, and 11.25 L is nonane. Also, note that because the conditions are remaining constant, and because amount and volume are directly proportional, we can say that;
Add these together to get 371.25 L of carbon dioxide.
And thanks for the offer but I won't be tutoring chemistry =P Check the tutoring forum, there's quite a few quality chem tutors there already. Shivesh (shiveshvarmaxD) and Collin (coblin) are probably the first two that come to mind, and I haven't really heard any complaints about either of them.
Post by: excal on December 04, 2008, 02:08:46 pm
...not that it's a bad thing :P
Post by: shinny on December 04, 2008, 02:10:46 pm
Post by: khalil on December 04, 2008, 04:00:30 pm
Post by: shinny on December 04, 2008, 04:05:42 pm
Post by: khalil on December 04, 2008, 04:09:47 pm
You are given 5 half cells in each of the following questions. For each, construct
i) the galvanic cell with the HIGHEST voltage possibla and
ii) the galvanic cell with the LOWEST voltage possible
All cells are availible for both galvanic cells
a) Cu/Cu^2+ Ag/Ag^+ Zn/Zn^2+ H(2)/2H^+ Cl(2)/2Cl^-
Also, coblin and shivesh are NOT my tutors because they tutor at the STATE library which is way to far from the southeastern suburbs, plus they charge a whooping $30/hr...THATS HEAPS....theres no point studying in uni..if they tutor for the rest of their lives they will be well off!
Post by: shinny on December 04, 2008, 04:14:13 pm
Post by: khalil on December 04, 2008, 04:20:21 pm
Post by: khalil on December 04, 2008, 04:23:37 pm
answer when u get back :)
Post by: bturville on December 04, 2008, 04:24:22 pm
Post by: khalil on December 04, 2008, 04:26:21 pm
Post by: khalil on December 04, 2008, 04:37:58 pm
Post by: bturville on December 04, 2008, 04:41:23 pm
Post by: khalil on December 04, 2008, 05:50:47 pm
Post by: Collin Li on December 04, 2008, 08:37:10 pm
My only complaint about coblin is that he'll probably mark your work in hot pink.
...not that it's a bad thing :P
What? No I don't.
Post by: khalil on December 12, 2008, 03:53:19 pm
Draw the stuctural formula of 1,2,3-trimethylbutan-1-ol
the answers have 2 OH's .....dont know if they made a mistake
btw the question is in pg.136 Q8 d in the jacaranda textbook
thanks
Post by: khalil on December 12, 2008, 05:22:08 pm
An oxide of iron contains 21.33% oxygen by mass. Find the empirical formula. Ans: Fe(2)O(3)
A compound X is used in ceramic work in the form of its hemihydrate X..5H(2)O which, when mixed with water, gives a solid dihydride X.2H(2)O. If 2.9g of hemihydrate yeilds 3.44g of dihydride, what is the molar mass of the dihydrate X.2H(2)O Ans, 136
thanks
Post by: Collin Li on December 12, 2008, 09:46:17 pm
Hey can someone help me with this question:
Draw the stuctural formula of 1,2,3-trimethylbutan-1-ol
the answers have 2 OH's .....dont know if they made a mistake
btw the question is in pg.136 Q8 d in the jacaranda textbook
thanks
That's a pretty weird question already, since that molecule when drawn out should really be named by "pent-" rather than "but-". There are 5 carbons in the longest chain, since there is a methyl group off the end.
Also,
An oxide of iron contains 21.33% oxygen by mass. Find the empirical formula. Ans: Fe(2)O(3)
1 gram of the iron oxide has 0.2133 g of oxygen and 0.7867 g of iron. Divide by their molar masses to reveal:
Note: the fact we chose "1 gram" makes no difference, because we're interested in the ratio between:
Anyway:
Hence
A compound X is used in ceramic work in the form of its hemihydrate X..5H(2)O which, when mixed with water, gives a solid dihydride X.2H(2)O. If 2.9g of hemihydrate yeilds 3.44g of dihydride, what is the molar mass of the dihydrate X.2H(2)O Ans, 136
Since the
Since
Once again, the answer is wrong, because we're not done: we want
Crap book.
Post by: khalil on December 13, 2008, 03:14:24 pm
If a compound is 0.5H(2)O does that mean there is 1 hydrogen? (.5x2)
Post by: Mao on December 13, 2008, 04:57:56 pm
Post by: Collin Li on December 13, 2008, 07:52:38 pm
Thanks Coblin
If a compound is 0.5H(2)O does that mean there is 1 hydrogen? (.5x2)
Yes.
Post by: khalil on December 13, 2008, 07:56:08 pm
Thanks Coblin
If a compound is 0.5H(2)O does that mean there is 1 hydrogen? (.5x2)
Yes.
Is CuSO(4).5H(2)O the same as CuSO(4)H(10)O(2)?
Post by: Collin Li on December 13, 2008, 08:01:32 pm
The reason why they write it like
Post by: dekoyl on December 13, 2008, 08:38:15 pm
So there's one hydrogen and.. half an oxygen? Or does it becomeThanks Coblin
If a compound is 0.5H(2)O does that mean there is 1 hydrogen? (.5x2)
Yes.
Post by: Collin Li on December 13, 2008, 08:40:33 pm
You could similarly write something like:
Post by: dekoyl on December 13, 2008, 08:43:49 pm
I just thought it had to be a whole number (so to multiply all the species by 2 to make it
Post by: khalil on December 20, 2008, 08:51:01 pm
0.148g of a metal carbonate exactly reacts with 20ml of 0.1 M HCL. The formula of the metal carbonate is most likely be:
A. Li(2)CO(3)
B. Na(2)C0(3)
c. MgC0(3)
D. SrC0(3)
Post by: Mao on December 20, 2008, 09:51:01 pm
and then use
Post by: khalil on December 21, 2008, 10:52:22 am
Post by: Mao on December 21, 2008, 02:59:18 pm
i.e. one mole of carbonate reacts with 2 moles of HCl.
20mL of 0.1M of HCl reacted,
which means that
we know that
now you can match up the correct option by finding the Mr of each.
Post by: khalil on December 21, 2008, 09:55:44 pm
Post by: khalil on December 28, 2008, 12:55:12 pm
Phosphorus can be determined gravimetrically by carrying out a numbe of steps, eventually leading to its precipitation as insoluable Mg(2)P(2)0(7). In one such analysis, a 14.298g sample of fertiliser yielded 4.107g of Mg(2)P(2)O(7) precipitate.
(a) Calculate the mass of phosphorous in the precipitate.
I got 1.14g, but the book says 0.8967g.........What the?
Post by: Rebecca.tutoring on December 28, 2008, 08:01:16 pm
Post by: khalil on December 28, 2008, 09:55:28 pm
Yeah I got the same as you - maybe you copied down the question wrong, or (more likely) the book could be wrong?yer maybe the book is wrong...if the book is continuously wrong then what can i rely on? :(
Post by: Mao on December 29, 2008, 11:12:57 am
I did tell you textbook questions are dodgy :PYeah I got the same as you - maybe you copied down the question wrong, or (more likely) the book could be wrong?yer maybe the book is wrong...if the book is continuously wrong then what can i rely on? :(
Post by: hard on December 29, 2008, 04:05:14 pm
you can rely on MaoI did tell you textbook questions are dodgy :PYeah I got the same as you - maybe you copied down the question wrong, or (more likely) the book could be wrong?yer maybe the book is wrong...if the book is continuously wrong then what can i rely on? :(
Post by: khalil on December 29, 2008, 08:00:30 pm
lol....yer and u said the TSFX ntoes were dodgy....the only thing left to do is checkpoints and theres not many questions thereI did tell you textbook questions are dodgy :PYeah I got the same as you - maybe you copied down the question wrong, or (more likely) the book could be wrong?yer maybe the book is wrong...if the book is continuously wrong then what can i rely on? :(
Post by: hard on December 29, 2008, 08:32:07 pm
i must agree with the tsfx notes being dodgy. There's no doubting that. 135 for summer school methods and all you pay for is a book of repeated notes that you already have in your text book plus 6 hour lecture to which 90% of it you wouldn't have a clue what's going on as this is all extraterrestrial mumbo jumbo so far. i suggest Access Education. They give you some helpful pointers.lol....yer and u said the TSFX ntoes were dodgy....the only thing left to do is checkpoints and theres not many questions thereI did tell you textbook questions are dodgy :PYeah I got the same as you - maybe you copied down the question wrong, or (more likely) the book could be wrong?yer maybe the book is wrong...if the book is continuously wrong then what can i rely on? :(
Post by: Mao on December 29, 2008, 08:36:07 pm
i must agree with the tsfx notes being dodgy. There's no doubting that. 135 for summer school methods and all you pay for is a book of repeated notes that you already have in your text book plus 6 hour lecture to which 90% of it you wouldn't have a clue what's going on as this is all extraterrestrial mumbo jumbo so far. i suggest Access Education. They give you some helpful pointers.lol....yer and u said the TSFX ntoes were dodgy....the only thing left to do is checkpoints and theres not many questions thereI did tell you textbook questions are dodgy :PYeah I got the same as you - maybe you copied down the question wrong, or (more likely) the book could be wrong?yer maybe the book is wrong...if the book is continuously wrong then what can i rely on? :(
Agreed. TSFX teaches a lot of crap that aren't really on the course.
Access Education, on the other hand, teach you what is actually important. My experiences with them have all been excellent, especially chemistry. One of their chem lecturer, Chris Dwyer, is very awesome, ed_saifa can possibly tell you more =]
Post by: khalil on December 30, 2008, 08:11:23 pm
I will only go to Acess education NOW!i must agree with the tsfx notes being dodgy. There's no doubting that. 135 for summer school methods and all you pay for is a book of repeated notes that you already have in your text book plus 6 hour lecture to which 90% of it you wouldn't have a clue what's going on as this is all extraterrestrial mumbo jumbo so far. i suggest Access Education. They give you some helpful pointers.lol....yer and u said the TSFX ntoes were dodgy....the only thing left to do is checkpoints and theres not many questions thereI did tell you textbook questions are dodgy :PYeah I got the same as you - maybe you copied down the question wrong, or (more likely) the book could be wrong?yer maybe the book is wrong...if the book is continuously wrong then what can i rely on? :(
Agreed. TSFX teaches a lot of crap that aren't really on the course.
Access Education, on the other hand, teach you what is actually important. My experiences with them have all been excellent, especially chemistry. One of their chem lecturer, Chris Dwyer, is very awesome, ed_saifa can possibly tell you more =]
Post by: hard on December 30, 2008, 08:26:02 pm
good decision.I will only go to Acess education NOW!i must agree with the tsfx notes being dodgy. There's no doubting that. 135 for summer school methods and all you pay for is a book of repeated notes that you already have in your text book plus 6 hour lecture to which 90% of it you wouldn't have a clue what's going on as this is all extraterrestrial mumbo jumbo so far. i suggest Access Education. They give you some helpful pointers.lol....yer and u said the TSFX ntoes were dodgy....the only thing left to do is checkpoints and theres not many questions thereI did tell you textbook questions are dodgy :PYeah I got the same as you - maybe you copied down the question wrong, or (more likely) the book could be wrong?yer maybe the book is wrong...if the book is continuously wrong then what can i rely on? :(
Agreed. TSFX teaches a lot of crap that aren't really on the course.
Access Education, on the other hand, teach you what is actually important. My experiences with them have all been excellent, especially chemistry. One of their chem lecturer, Chris Dwyer, is very awesome, ed_saifa can possibly tell you more =]
Post by: AQ on December 30, 2008, 08:42:41 pm
oh yerrrrrr ...thanks mate
khalil you only doing 5 subjects all up for vce ??
I wished i stayed at home and prepared for yr 12, make a mistake going on a holiday this yr.
Ow well, im not worried about me falling behind. I cant catch up and im pretty good in chemistry.
Post by: AQ on December 30, 2008, 08:56:10 pm
I dont know where it is just me or some of my holiday hw is really hard.....please help me out
Te is heavier than I, yet it is placed before I in the periodic table. Why?
115L of gas at 455mmHg is heated from 22 degrees to 350K. what is the new pressure?
A car burns 45L of fuel (75% octane and 25% nonane) in a week. What volume of CO(2) does this result in, at SLC.
there is more to come....if u can answer these u are a genius and should become my tutor :)
khalil dont worry..
I think theres nothing to worry about, you may feel like its hard becuase you havnt learnt it over school or you teacher may have just given it for you to attemp.
If you can't answer a question, best thing to do is leave it aside and move on. Don't ever worry about the question. you can ask your friends over VN (which they are very helpful) or you can ask your teacher.
btw, what school do you go to?
Post by: khalil on December 30, 2008, 09:34:08 pm
Yea thanks for the advice, although its not as easy as it seems. If i dont know a question(which happens a lot)....i relli cant be bothered typing up soo much for a simple question to be answered! and sometimes i haev to wait max 2 days. i noe it doesnt seem much but i tend to forget the question i asked to answer! plus my teacher is just as worse as me!I dont know where it is just me or some of my holiday hw is really hard.....please help me out
Te is heavier than I, yet it is placed before I in the periodic table. Why?
115L of gas at 455mmHg is heated from 22 degrees to 350K. what is the new pressure?
A car burns 45L of fuel (75% octane and 25% nonane) in a week. What volume of CO(2) does this result in, at SLC.
there is more to come....if u can answer these u are a genius and should become my tutor :)
khalil dont worry..
I think theres nothing to worry about, you may feel like its hard becuase you havnt learnt it over school or you teacher may have just given it for you to attemp.
If you can't answer a question, best thing to do is leave it aside and move on. Don't ever worry about the question. you can ask your friends over VN (which they are very helpful) or you can ask your teacher.
btw, what school do you go to?
i go to Lyndale SC which is in dandy north (SE region)
im guessing ur turkish?
Post by: khalil on December 31, 2008, 03:08:37 pm
Post by: Mao on January 01, 2009, 06:16:39 pm
If the standard has a low molar mass, the errors of measurement in weight could mean a huge variation in the number of moles. However, if it had a higher molar mass, the errors of measurement would correspond to a significantly lower variation in the number of moles, hence more accurate.
Think about how accurately you can calculate:
1) how many grains of rice in 1kg bag
2) how many chocolate bars in 1kg bag
Post by: khalil on June 02, 2009, 08:46:19 pm
Post by: khalil on June 02, 2009, 08:46:50 pm
Post by: d0minicz on June 02, 2009, 09:39:48 pm
Post by: TrueTears on June 02, 2009, 09:42:05 pm
Post by: khalil on June 03, 2009, 08:58:55 pm
Post by: Mao on June 03, 2009, 10:17:23 pm
If it is a small peak, it may because of one C13 (isotope of carbon that has a mass of 13) is present in it.
Post by: khalil on June 04, 2009, 11:12:18 am
Post by: Mao on June 04, 2009, 12:35:59 pm
Post by: khalil on June 04, 2009, 03:47:01 pm
Post by: khalil on June 04, 2009, 06:31:17 pm
Post by: khalil on June 04, 2009, 06:37:10 pm
http://www.vcaa.vic.edu.au/vce/studies/chemistry/assessreports/2005/chemistryassessreportnov05.pdf
Post by: Mao on June 04, 2009, 09:10:16 pm
yer but its not in its full form in aspirin, its H is missing
An H. radical may join on to the m/e=137 ion. It is possible
Also, are disaccharides solid? How can you tell. There was a VCAA question on this
table sugar is a disaccharide
Post by: khalil on June 05, 2009, 05:18:00 pm
a) C-C compared to C=C b) C-Cl compared to C-Br c) C-O compared to C-H d)C=C compared to C=-C (triple bond)
Post by: Mao on June 05, 2009, 06:22:59 pm
C=C > C-C
C-Cl > C-Br [Cl is more electronegative hence pulls closer]
C-O > C-H
C=C > C=C
Greater bond strength requires greater energy