Recent content by proskier

i guess what i really want to know is if frequency changes as it crosses a medium,

Please help! In my physics, I need to find the wavelengths of the waves from a source in a different medium. In the first medium, my angle of incidence is 35 degrees and with a speed of 150m/s and a frequency of 75Hz. In the different medium the speed has dropped to 96m/s. I know the...

Help please! Here's the question I'm having problems with: The solubility product of calcium hydroxide, Ca(OH)2, is 7.9 x 10^-6 at 25 degrees celsius. Will a precipitate form when 100mL of 0.10 mol/L of CaCl2 solution and 50.0 mL of 0.070 mol/L of NaOH solution are combined? Do I...

thanks a lot really appreciate it

i'm still not getting it... so here's the question: For the reaction CO + NO2 --> CO2 + NO the activation energy for the forward reaction is 135 kJ/mol of CO reacted. a) Determine the heat of reaction. For this I got -379.1 kJ/mol by using the heats of formation from my text and...

Is DeltaG the heat of reaction?

Please I need some help. I'm working on a chemistry question and have to determine the activation energy for a reverse reaction. How do you do that? I've looked all over my text and through my notes and cannot find a clear way on how to solve it. Thanks.