| Author |
Enforcers GK Question of the Day (TUE)
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| ruscorp 2003-01-21, 10:05 am |
| What is the molarity of a KF (aq) solution containing 116 grams of KF in 1.00 liter of solution?
A. 1.00 M
B. 2.00 M
C. 3.00 M
D. 4.00 M | |
| sasquatchmann 2003-01-21, 10:16 am |
| I thought th GK in the title stood for General Knowledge.
I guess most peoples general knowledge doesn't get much past basic chemistry, let alone stuff like this. | |
| Mr. Linux Guy 2003-01-21, 10:21 am |
| You need moles to calculate molarity and you need temperature and pressure to calculate number of moles. Insufficient information. | |
| ruscorp 2003-01-21, 10:31 am |
| quote:
Originally posted by Mr. Linux Guy
You need moles to calculate molarity and you need temperature and pressure to calculate number of moles. Insufficient information.
No, insufficient information. I gave you more than enough to solve the problem. This is a typical high school question I saw similiar ones on a couple of final exams. The answer is simple:
Molarity = step 1: find the moles of solute using the formula:
mass of solute (g) divided by formula mass of solute
Step 2: divide the moles of solute by volume of solution in liters M / V.
Or if you know the moles of solute,
Molarity = moles of solute divided by volume of solution in liters . KF has a formula mass of 39 + 19 or 58 g/mole. Since 116 grams are given, 116g / 58g/mole = 2 moles of solute.
To find the Molarity, take 2 moles of solute and divide by 1 L of solution.
2 moles / 1 L = 2.00 M solution
B. 2.00 M is the correct answer. | |
| everetjo 2003-01-21, 10:31 am |
| 4.142857142857143 mol | |
| Mr. Linux Guy 2003-01-21, 10:36 am |
| quote:
Originally posted by ruscorp
No, insufficient information. I gave you more than enough to solve the problem. This is a typical high school question I saw similiar ones on a couple of final exams. The answer is simple:
Molarity = step 1: find the moles of solute using the formula:
mass of solute (g) divided by formula mass of solute
Step 2: divide the moles of solute by volume of solution in liters M / V.
Or if you know the moles of solute,
Molarity = moles of solute divided by volume of solution in liters . KF has a formula mass of 39 + 19 or 58 g/mole. Since 116 grams are given, 116g / 58g/mole = 2 moles of solute.
To find the Molarity, take 2 moles of solute and divide by 1 L of solution.
2 moles / 1 L = 2.00 M solution
B. 2.00 M is the correct answer.
number of moles = PV/RT. How else would you find the number of moles? | |
| everetjo 2003-01-21, 10:37 am |
| SH!T i had that...
good question ruscorp | |
| ruscorp 2003-01-21, 10:41 am |
| quote:
Originally posted by Mr. Linux Guy
number of moles = PV/RT. How else would you find the number of moles?
Haha, your handy dandy New York State Regents Chemistry reference tables will help you. Every student in the state has one for reference.
http://www.emsc.nysed.gov/ciai/test...chemref2002.pdf
Perhaps I should make the question a little easier tomorrow that was a tough one. 
No hard feelings now. | |
| everetjo 2003-01-21, 10:44 am |
| you should make it like final jeopardy and give us the subject before hand... | |
| Mr. Linux Guy 2003-01-21, 10:45 am |
| quote:
Originally posted by ruscorp
Haha, your handy dandy New York State Regents Chemistry reference tables will help you. Every student in the state has one for reference.
http://www.emsc.nysed.gov/ciai/test...chemref2002.pdf
Perhaps I should make the question a little easier tomorrow that was a tough one.
No hard feelings now.
No fair, having to look up stuff! I wanted to calculate something! | |
| ruscorp 2003-01-21, 10:55 am |
| quote:
Originally posted by Mr. Linux Guy
No fair, having to look up stuff! I wanted to calculate something!
That's not what I would have said, I just didn't show up for the exam.  | |
| everetjo 2003-01-21, 11:10 am |
| quote:
originally posted by ruscorp
"That's not what I said, I wish that do high school all over again"
makes sense.. | |
| sasquatchmann 2003-01-22, 5:25 am |
| quote:
Originally posted by everetjo
makes sense..
No I think what he said made sense, your mis-quote made no sense at all.. | |
| MartyMcFly 2003-01-22, 5:37 am |
| quote:
Originally posted by sasquatchmann
your mis-quote made no cents at all..
what? do you mean a good post could make you money? | |
| iggy4270 2003-01-22, 5:58 am |
| quote:
Originally posted by Mr. Linux Guy - How else would you find the number of moles?
Go out in the garden and set traps for the little bastards.  | |
| Mr. Linux Guy 2003-01-22, 6:13 am |
| quote:
Originally posted by ruscorp
That's not what I would have said, I just didn't show up for the exam.
Requiring a bloke to look stuff up in tables I consider as not having enough information. | |
|
| Can your questions be more general, please. I live in Britain and we don't do that kind of science stuff. | |
| Mr. Linux Guy 2003-01-22, 7:06 am |
| quote:
Originally posted by oik
Can your questions be more general, please. I live in Britain and we don't do that kind of science stuff.
Isaac Newton was British! He did that science stuff. | |
| sasquatchmann 2003-01-22, 7:08 am |
| quote:
Originally posted by oik
Can your questions be more general, please. I live in Britain and we don't do that kind of science stuff.
Yeh we just invent it all, then forget how to do it..
We like questions that are simple!!
Blimey just heard that Bill Wierbernek(or however you spell it) has died.
Shame always liked watching him wield his cue(and pint) around the green beize. | |
| ruscorp 2003-01-22, 9:58 am |
| quote:
Originally posted by Mr. Linux Guy
Requiring a bloke to look stuff up in tables I consider as not having enough information.
I totally agree. Please tell that to the NYS Board of Regents, they seem to think it's fundamental. I would bet 99.9% of the board members have never even taken a Regents exam. | |
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| quote:
Originally posted by ruscorp
Regents exam.
Is that the exam you take when you are going to be King, mate? | |
| ruscorp 2003-01-22, 10:11 am |
| quote:
Originally posted by oik
Is that the exam you take when you are going to be King, mate?
Then consider every NYS high school student a king.... | |
| everetjo 2003-01-22, 10:16 am |
| quote:
originally posted by ruscorp
"Then consider every NYS high school student a king...."
well...only the 'college bound' students.
all that work for a stupid gold seal on the diploma.. | |
| ruscorp 2003-01-22, 10:18 am |
| quote:
Originally posted by everetjo
well...only the 'college bound' students.
all that work for a stupid gold seal on the diploma..
Don't forget the gold tassel! | |
| Mr. Linux Guy 2003-01-22, 10:18 am |
| quote:
Originally posted by ruscorp
I totally agree. Please tell that to the NYS Board of Regents, they seem to think it's fundamental. I would bet 99.9% of the board members have never even taken a Regents exam.
Understanding the media would seem to be more crucial to me. But then again, since the board of regents won't be taking the exams, I guess they figure its fair stuff. | |
| everetjo 2003-01-22, 10:19 am |
| oh right...
and if your NHS you get that ridiculous yellow scarf and a picture with the biggest losers around | |
| ruscorp 2003-01-22, 10:23 am |
| I've failed nearly every Regents. I have no idea how I got out of high school. | |
| everetjo 2003-01-22, 10:51 am |
| what do you think was the most difficult regents?
i failed sequential course III regents because my teacher was a wrestling coach moron who was more interested in what was down this blonde girl's shirt than anything else. i had to re-take the exam in summer school at another school. (the things we do for a fregin gold seal)
the guy explained interpolation as "when you kind of estimate what the difference between these two things.."
exactly..he's a moron | |
| ruscorp 2003-01-22, 11:03 am |
| quote:
Originally posted by everetjo
what do you think was the most difficult regents?
i failed sequential course III regents because my teacher was a wrestling coach moron who was more interested in what was down this blonde girl's shirt than anything else. i had to re-take the exam in summer school at another school. (the things we do for a fregin gold seal)
the guy explained interpolation as "when you kind of estimate what the difference between these two things.."
exactly..he's a moron
Never took sequential course 3 Regents, I took accounting as a variance or course 3.
Math Course 1: 21
Math Course 1: 36 (Second time)
Math Course 1: 65 (Third time)
Math Course 2: 16
Math Course 2: 24 (Second time)
Biology: 45
Chemistry: 36
Earth Science: 85
Global Studies: 55
US History: 85
English: 36
English: 45 (Second time)
English: 51 (Third time)
Never took a any foreign language Regents.
So I'm pretty dumb. | |
| everetjo 2003-01-22, 11:19 am |
| wait..so did you get the regents diploma?
what's with the chemistry question that you were so confident about?? you were steps from titration | |
| ruscorp 2003-01-22, 11:24 am |
| quote:
Originally posted by everetjo
wait..so did you get the regents diploma?
Hell no, I'm an idiot.
quote:
Originally posted by everetjo
what's with the chemistry question that you were so confident about?? you were steps from titration
No idea, picked it cause it looked hard. |
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