<p>thanks gfaith :)</p>
<p>if i had yellow/orange to purple in 5c how many points off would that be?</p>
<p>Correction: 5c should probably say pink/purple - I assume they'll give credit for either.</p>
<p>Whynot123: Best guess - 5c won't be worth more than 1 point.
Deltaroyale: 3f your number of moles is wrong.
3e 3600 coulombs does not equal 3600 grams. I don't have the problem with me, but I think it was</p>
<p>1.5c/s x 60s/min x 40min x 1mol e-/96500c x 2 mol Cu/4 mol e x 63.55gCu/1molCu = 1.19</p>
<p>I think that I got all of them except the K=1 one... and possibly the color change one, depending on whether or not they take into account Fe ion color =)</p>
<p>for the electrolytic one...if you did the whole thing backwards..like treated it as a voltaic cell..would you loose every point? or just like one or two?</p>
<p>My chem teacher told me that if you got a problem wrong early on and used that calculated value in subsequent questions (but did the correct calculations), you would get points for that question. I don't know if this is true or not... but it would be nice =)</p>
<p>that's true according to my calculus teacher. he said the graders refer to it as "read with student"</p>
<p>So does anyone know how to calculate a score if you think you know which points you missed on free response? If I misssed 8 to 10 points max on free response, how many points would i need on mc for a 5?</p>
<p>yeah for calculus I know it's true, but idk about chem. I hope though lol</p>
<p>I put my deltaG value is J, not kJ. that doesnt matter, does it?</p>
<p>i think as long as you wrote the right units</p>
<p>Ok, cool. I did, I just wantedto make sure it wasnt standard to us kJ.</p>
<p>dangit i should have just written net ionic. my teacher told us in class that you didnt have to though :( i guess she was wrong. i hope they don't take off too many points for that cuz i did get all the answers to the questions about the reaction correct...</p>
<p>so no one knows a way to calculate your score?</p>
<p>The way the scoring works is like this</p>
<p>FR is 50% of the total score. In the past, the whole test was worth 160pts, so FR is worth 80 pts total.
Question 1, 2, and 3 are worth 20% each of the 80 pts. (16 pts each)
Question 4 is worth 10% (8pts)
Question 5 and 6 are worth 15% each (12 pts each).</p>
<p>When grading the parts of a question, each is usually assigned a point value of 1 or two points. For example, based on past tests, for Question 1:
1a is probably worth 1pt
1b is probably worth 2 pts
1c is probably worth 2 pts
1d is probably worth 2 pts
1e is probably worth 2 pts.
Total points for question 1 - 9 points.</p>
<p>Since the section is worth 16 pts on the overall test, the scorer will take your point total and multiply by a factor of 16/9.</p>
<p>Another example - question 4 is scored as follows for each reaction
1 point for reactants
2 points for products
1 point for balancing
1 point for the question
Total points for question 4 - 15 points (5 points x 3 rxns)</p>
<p>Since Question 4 is only worth 8 pts on the total test, your points from question 4 will be multiplied by a factor of 8/15.</p>
<p>As you can see, its a little convoluted to get an accurate point total. If anyone cares, I can put together an estimate of what each part is worth based on past test rubrics.</p>
<p>that would be really helpful if you could gfaith...just to give an idea of my range on the free response (im rather clueless as of now).</p>
<p>thanks gfaith, youre awesome</p>
<p>For the thermodynamics FR question, shouldn't the energy change of the reaction be doubled since they gave you the heats of formation?</p>
<p>il bandito
The dH and dS given weren't intended to be heats of formation. The dH of -264 kJ was for the reaction as written, i.e. -264 kJ per 2 moles of NF3. If you interpreted it as dH(formation), answers in parts a,c and e would all change from the answer key I posted. If they don't accept your interpretation, you would lose points on a, but give you credit for c and e if you were consistent.</p>
<p>Best guess on points for each part, based on looking at rubrics back to 1999:</p>
<p>1a - 1
1b - 2
1c - 2
1d - 2
1e - 2</p>
<p>2a - 2
2b - 2
2c - 2
2d - 1
2e - 2</p>
<p>3a - 1
3b - 2
3c - 1
3d - 2
3e - 2
3f - 2</p>
<p>4 - 5 pts for each reaction (1 for reactants, 2 for products, 1 for balancing, 1 for question)</p>
<p>5a - 1
5b - 1
5c - 1
5d - 1 for each part (3 total)
5e - 2</p>
<p>6a - 1
6b - 1
6c - 2
6d - 1
6e - 2
6f - 2
6g - 1</p>