forum.virtualchallengemeets.com

Lets Start With Chem(Apparently it was very easy because nsguy got a 120 and I got a 68)
33. The combustion of methanol is described by the unbalanced equation

CH3OH + O2 ------> CO2 + H20

delta Hfdegree(kJ/mol) Sdegree(J/molK)

CH3OH -238.6 126.8
O2 0 205.0
CO2 -393.5 213.6
H2O -285.8 69.91
What is the upper limit of the temperature, in K, for which this reaction will be spontaneous?

35. The Equilibrium Constant, Kc, for thermal dissociation of F2 into atoms is .300. If 1.851 moles of F2 are placed in a 1.00L container, how many moles of F2 have dissociatied at equilibrium?

37. A solution is prepared by adding 2.0 mole of acetic acid and 1.0 moles of sodium acetate to enough water to make a 5.0L Solution. Acetic Acid: Ka = 1.8*10^-5. What is the pH of this solution?

38. What is the pH of a .884M solution of NH4NO3? The ionization constant of the weak base NH3 is 1.8*10^-5.

39. What is the solubility of Ag2CrO4 in a solution in which the silver ion concentration is maintained at .035M? The solubility product constant of that compound is 9.0*10^-12. Express the solubility as mole/L.

40. How long does it take(in hours) to prepare 4.00-g of Al by electrolysis of Al2O3 using a currentr of 2.50 amps

And now for Physics:
48 has a drawing, so cannot post it. If anyone has the test with them, please answer.
Same with 52.
53. A beam of elementary particles is traveling at .9c. It is observed that half of them decay in each 4.5 meters of distance traveled. What is the half life of those particles when they are at rest?

54. The London Eye is similar to a Ferris Wheel but is not because of the details of its constructjion. It is a vertical wheel with observation cars. It is 135 m in diameter. How fast would this wheel have to spin, in rpm, for the passengers to feel weightless at its top?

57. Another Diagram Question.

THANK YOU

Woah, this post makes my brain hurt.

Are these topics covered in a first year physics/chemistry class or do you have to do some research?

Umm... I noticed all of the chemistry questions (if not most) are all from AP chem (rarely any from pre-ap Chem),and as for the physics, most of it is from AP physics, although the basics you should learn in pre-ap physics (I don't like the terms first year or second year classes, because people take them all at different times, like for instance I skipped pre-ap physics and went straight into AP Physics B, practically, thereby teaching myself all of physics beforehand). There a couple questions (on the TMSCA tests anyway) that you need to research (in biology and physics, not so much chemistry).