[Burchellie]

Hello.. I'm new and I have been struggling with chemistry all year. Right now, I've got a C+ and I really need to bring my grade up to a B+. I thought I did really well on my last test and unfortunately, I got a 'C'. I am completely and utterly lost. I have this study guide that I can fill out and study for the test, but I can find any of the answers to any of the questions. I don't know what to do. I really just need this stuff to study, but I can't even get the answers.  I'm in tears right now....

So far, I have started my sudy guide. I have gotten some answers but I don't know if they are right. I was wondering If I could get some help...

What is the difference between elastic and inelsatic collisions?
What is the pressure formula?
What tool is used to messure pressure? (Is it a barometer?)
What is STP?(Is it standard Temperature and pressure?)

What is the standard Molar Volume of a gas at STP?
What is the ideal Gas law Constant?


Can anyone help me on some stoiciometry with gasses, demensional anaylisis with acid/ base chemistry, moloality and molarity if I showed the problems???


 

[seanifred]

these should all be in a high school chem book, but i'll try to help a little

an elastic collision is one in which kinetic energy and momentum is conserved (when two steel balls collide they bounce off one another and go back the opposite way)

an inelastic collision is one in which kinetic energy after the collision is less than kinetic energy before the collision (a bullet going into a block of wood is inelastic as the bullet does not bounce back)

at STP 1 mol of and ideal gas occupies 22.4 liters of space

the ideal gas law equation is:

PV = nRT

all of these values are variable except for R

P = pressure
V = volume
n = moles
T = temperature
R = gas constant

the actual value of the gas constant can vary depending on what notations for the other parameters you use, so be careful to keep units consistent when using the ideal gas law

hope that helped a little

-seano

[virus_freak]

What pressure? complete gas law is:
P1V1\T1 = P2V2\T2

[Borek]

What pressure?

There are different pressures? Please elaborate.

complete gas law is:
P1V1\T1 = P2V2\T2

PV = nRT is the most universal formula, and it was already listed.