I had a different form which didnt have a sample structure. I meant to ask will I be penalized if I drew crosses to represent electrons of one atom and dots for another?
For the question on wavelength (the modifying of the experiment for red food coloring), if we said decreased wavelength, would they accept that? I was looking for more information and I found http://hydrology1.nmsu.edu/teaching/soil698/student_material/spectrometer/page11.htm
which says
“Note: Sample color provides a good indication of what wavelength region to use A yellow solution absorbs light in the 400-500 nm region. A red solution absorbs light between500-600 nm and blue solutions absorb light in the 600-700 range.” Since the spectrophotometer was at 635nm, it would need to be decreased to a lower wavelength? I’m not sure since most people said higher wavelength.
My reasoning was that we want the light from the spectrophotometer to be absorbed - so if we had a higher wavelength, (like that of red light), then it would not be absorbed (since the food coloring is red). So we choose a complimentary color, and since red light has a higher wavelength, we should choose a wavelength that is decreased.
You should’ve left it ambiguous and put “change wavelength to satisfy red, rather than blue, food coloring.” That’s what I did
Yes, but I didn’t so now I would like to know if my reasoning was correct.
By the way, I did make a general statement about changing wavelength, THEN I said how to change it in a different sentence.
Okay, so let’s say I missed a maximum of 14 points on the FR. If I missed about 9 on MC is that still a 5?
Yes
Is it the consensus that 109.5 is acceptable for the bond angle then?
@nhnct21 the bond angle is in actually 104.5 degrees however many are saying that 109.5 is an acceptable answer
@nhnct21 @CanisMajor Actually, 109.5 is not an acceptable bond angle. 109.5 denotes the standard bond angle with something of a tetrahedral molecular geometry, and is much bigger than that of the bent structure due to the lack of electron repulsion.
@michelle426 yeah 104.5 is the correct answer I was just wondering if collegeboard might accept 109 as well
For 2a part i., if I rounded incorrectly to 4.33 instead of 4.34, will i still get credit?
^ Agreed. 109.5 will not earn the point.
So for 6b I chose KOH because I thought it was a strong base too. A lot of people have been telling me the only answer is NaOH. Can someone confirm for me pls
I put 105 degrees for the bond angle. Is that okay?
NaOH is correct.
Would 107.5 be acceptable?
Did anyone receive a response back from collegeboard?
@Wannabenerd1 about what?
Some ppl said they never had 2e on their frq and they contacted college board about it
Who said 109.5 was not acceptable? Remember they asked what is the APPROXIMATE value of the bond angle… If you demonstrate understanding that it is sp3 hybridized (i.e. 104.5-109.5), I’d imagine they’d accept it.