That would be horrible if those were experimental… I already missed a bunch of the other points on the non-controversial questions so I’m really counting on these other points :’(
You’re supposed to use 8.314 as K for that problem because the units is J
@Kitsyxoxo - I put NaF for 6 too, but I’m terrible at chemistry…
i think for the food colouring question, increasing the temperature would slow the reaction. The rate constant will increase and since the reaction is first order with respect to the food colouring, half-life = ln2/k. K increases so half-life increases and thus reaction takes longer time to finish.
Lets say that they did make a mistake and some people got it and others didn’t. Wouldn’t it be fair to just make two curves that way the people who had the problems and got it right still are rewarded for it, and those who didn’t get them aren’t penalized?
@iplayball - I put temperature with the same reasoning, but literally everyone I know circled concentration.
I’m terrified. Not cancelling my score, but wouldn’t be surprised if I saw a 2 in July.
Never mind, I got it.
Isn’t K inversely proportional to T in second order reactions? Kinetics was my worst unit 
@Ninjadu not surprised if that is a mistake at this point.
Remember, average kinetic energy is literally temperature. As temperature increases, so does the rate of reaction: the average kinetic energy of the molecules in solution will collide at a faster rate. Pressure also goes up with temperature due to higher average kinetic energy, as the molecules will be hitting the walls of the container with more force and faster rate. If the temperature is constant, then the average kinetic energy of all the molecules is the same.
If they had a question asking which molecule would have the highest average velocity at constant T for all compounds, then it would be the lightest one. Hopefully that clears up any confusion. I picked the one for increase concentration of blue dye to make sure it doesn’t oxidize as quickly.
Does anyone know when they release the answers to the free response questions?
@baller55 You have a couple of mistakes, but overall it looks pretty good. I’d score it a solid 35-36.
@chemstar who are you referring to? so I can compare what I got to their answers.
@zach1198 To baller55’s answers, I’d put up a key right now if you guys wanted, but I just finished my Physics Exam so I’m pretty burnt out.
@chemstar that would be awesome, but no need to do it today. Whenever you get around to it an answer key would be great so i can get a good idea where i stand.
Also, does anyone know the cutoff for a 4? I know it was a 72 for a 5 last year.
58
58% for a 4? Wow I’m really counting on MC to carry my grade and I don’t think I even did that well :’(
OH SHOOT did the water molecules actually have to be touching the Ca2+ ion? I drew the 4 water molecules with oxygens facing the ion but not actually touching, just close together 
Does anyone know if AP accepts abbreviated electron configuration?