Question

Chem question

Answer 1

IMF question

Answer 2

Question on vapor pressure

Answer 3

Condensation: dealing with kinetic/potential energy

Answer 4

@Rushwr @taramgrant0543664 @Empty

Answer 5

I'm thinking D, D and then C I think I have it in the right order

Answer 6

condensation is \[(g) \rightarrow (l)\] So i thought kinetic energy would have to go down. for the second one

Answer 7

For the 1st one I'll go with B

Answer 8

@Rushwr why not D? can you explain..

Answer 9

not saying you're wrong

Answer 10

Yep sorry kinetic energy does decrease

Answer 11

cuz HCl has dipole dipole interactions

Answer 12

ok so for the first one it is B

Answer 13

for the second one I'll go with D or b

Answer 14

not sure though

Answer 15

isn't this covalent bonding?

Answer 16

Non polar covalent?

Answer 17

it is but they have asked us for the intermolecular interaction not the bonding type right?

Answer 18

C2H6 is covalent bonding

Answer 19

oh yeah... true !

Answer 20

wouldn't that be london dispersion forces/ vanderwalls forces for c2H4?

Answer 21

for the last question I'll go with D

Answer 22

I'm pretty sure D is right for that last one

Answer 23

yes that is london dispersion forces @Photon336

Answer 24

Yeah I think the last one is D. let me check

Answer 25

oh.. wait.. it's E whaaat...

Answer 26

@Empty thoughts?

Answer 27

Phase change, is an equilibrium process so i'm going to make a stretch and say that at an equilibrium process temperature = constant so KE stays the same. (don't quote me on that)

Answer 28

I can't explain why Potential energy decreases.

Answer 29

FYI If you want to see the rest of the questions i attached them here,

Answer 30

Condensation is gas to liquid so you're creating order and energy decreases

Answer 31

OK, but the way though of it was that if kinetic energy goes down then PE has go up
KE + PE + Wf = Mechanical energy. don't know thinking that they have to be conserved. (but i'm working backwards from the answer) the say PE went down. I guess we can go on to the second question about vapor pressure.

I attached the PDF to the conversation.

Answer 32

maybe it's like this. When a liquid is condensed all he molecules pack in to a smaller volume right? So heat is given out. That heat is given out by the potential energy having the kinetic energy unchanged.

Answer 33

something like that would do right?

Answer 34

Yes it would

Answer 35

forcing something into a smaller volume would imply a decrease in entropy

Answer 36

But i wonder if that's the case during any phase change

Answer 37

b/c a phase change is an equilibrium process, where t is constant, but i think that's probably the best way to explain it.. so the heat is released by the (total potential energy) going down, leaving KE unchanged?

Answer 38

Sounds pretty good to me. I'm going to bed now so good night enjoy the rest of the question and I'll check in again with this tomorrow!

Answer 39

will post one more question after this then I g2g

Answer 40

I'm not sure about the vapor pressure question @Empty thoughts?

Answer 41

Hmmm Yeah I was a bit confused by this as well I was almost sure it was D but I was also fairly certain potential energy decreased as well since the distances between particles should be less as they start to bond to each other slightly. I guess I need to go look at vapor pressure and all this I'm sort of rusty I guess.

Answer 42

I'm going to re-post the vapor pressure question tomorrow

Answer 43

so as you go from say (s) to liquid the kinetic energy increases but PE decreases right?

Answer 44

We didn't get to the vapor pressure question

Answer 45

Ok so for im assuming question 7 that you posted about the vapor pressure. I am going with answer choice d. Both I and III are correct but II increasing the volume wouldn't have any affect on the vapor pressure.