Pchem Definition and 14 Threads

Hi all, I know that some you have chemistry backgrounds (mine is in nuclear physics), so wanted to pose a question for a friend who is a chemist and is thus not on this site. He has a degree in biology, with emphasis on synthetic organic chemistry. His overall GPA was ~ 3.2 (3.4 in major). He...

Homework Statement Consider the reaction of pyruvic acid (CH3COCOOH) into gaseous acetaldehyde (CH3CHO) and gaseous CO2, which is catalyzed an aqueous solution by the enzyme pyruvate decarboxylase. Assume ideal gas behavior only for the CO2. (a) Calculate ∆298 0 for this reaction. (b) Calculate...

Electrons are accelerated in an electrical potential of: ΔΦ = 105 V and are focused on a biological specimen. Assume that the kinetic energy of an electron is given by eΔΦ where e is the charge of an electron. What is the smallest possible object that can be resolved assuming that the...

1. Homework Statement What do you predict the voltage will be measured from B to D directly? Vtot = 1.0 V peak-peak Two parallel branches, one with two 1.5 kOhm resistors in series, one with a 1.5 kOhm resistor and a 0.1 μF capacitor in series (see attached diagram) Homework Equations V=IR...

Hi, I am having trouble with this concept... "A mean speed (c) is calculated by multiplying each speed by the fraction of molecules that have that speed, and then adding all the products together. When the speed varies over a continuous range, the sum is replaced by an integral. To employ...

Homework Statement Find (\frac{dV}{dp})_{n,T} for the Van de Waals gas law Homework Equations Van de Waals gas law: (\frac{p+an^2}{V^2})(V-nb)=nRT The Attempt at a Solution I just started doing problems like these so I would like to know if I am doing them right... What I did was I took...

Homework Statement 8.9985 g of Na2HPO4 and 4.0211 g of NaH2PO4 * 7 H2O are added to 1 L of 0.20 M KCl in water. KCl does not participate in any way but to maintain ionic strength, at 0.20 M. H3PO4 (aq) + H2O → H2PO4- (aq) + H3O+, Ka1 = 7.11 x 10-3 Ka2 = 6.32 x 10-8 Ka3 = 7.1 x 10-13 (a)...

1. question http://farm9.staticflickr.com/8282/7804721900_bd0b895954_b.jpg On a catalyst surface, the formation reaction of CO2 by the oxidation of CO with O2 proceeds in the following mechanism. (1) O2(g) + 2V <---> 2O(ads) (equilibrium constant KO2) (2) CO(g) + V <--> CO(ads)...

I want to take PChem, but I'm wondering if I should wait until I have a deeper understanding of quantum mechanics and electricity and magnetism. I've seen QM in a modern physics class and I've taken a sophomore level E&M class. I've got my calculus down pretty well, and I've taken two...

i really need help with my homework if people can help lead me to the answer it would be really helpful. so far i was only able to do number 1 1) If 2.00 mol of an ideal gas, initially at 1.53 atm and 280 K, is allowed to expand isothermally under a constant external pressure of 0.920 atm...

For organic chemistry, in an experiment, how does the epimerization (of H) of Potassium carbonate work? Does carbonate work as a base and deprotonate a hydrogen and then by refluxing it do you get an epimer? For the pchem part, If the 3.0g of gas occupies 11.2L at 0.0C and 0.25 atm, then...

Hi, Here's an idea I can't quite figure out the answer to. If we were to set up a container of an ideal gas (say He) that had a movable lid such that the lid did not interact with the walls to generate friction or the like. On top of the lid we place a brick which is able to hold the lid...

Homework Statement The following equations of state are occasionally used for approximate calculations on gases: (gas A) pVm = RT(1+b/Vm), (gas B) p(Vm -b) = RT. Assuming that there were gases that actually obeyed these equations of state, would it be possible to liquefy either gas A or B...

I will be picking my Spring courses on Monday and I just want to know which class you would recommend me taking first: analytical chem or physical chemistry? does it matter which I take first? I will have to take physical chemistry 2, so should I take physical chemistry first because of that...