## Photon336 one year ago Question

1. Photon336

388/389

2. Photon336

386/387

3. Photon336

@taramgrant0543664 @Rushwr @sweetburger @Woodward

4. Photon336

388 @rushwr?

5. Rushwr

thinking

6. Photon336

$Ca _{s} + Cl _{2g} \rightarrow CaCl _{2s}$

7. Rushwr

is it B?

8. Rushwr

cuz the reaction is a formation reaction hence it is an exothermic reaction. SO delta H is negative

9. Rushwr

$\Delta S _{surr} =\frac{ -\Delta H }{ T }$

10. Photon336

$\Delta G = \Delta H - T \Delta S$ so for our reaction the entropy would have to go down. so the sign TDeltaS would be positive. that means that for our reaction, which we know is spontaneous because we form our reactants. Delta G < 0 if we put the two together. 1. Delta G <0 2. Entropy Delta S < 0 3. TdeltaS > 0 THIS means that T delta S would be > 0 positive. and Delta G < 0 therefore the enthalpy Delta H would have to be large and negative, to offset the positive entropy and that would make delta G < 0

11. Photon336

sorry form our products***

12. Rushwr

389. A Cuz when they had more reactants in to the system the system tend to attain the equilibrium by making more products. So the euilibrium points shifts to the left forming more products.

13. Photon336

$\Delta G = \Delta H - T \Delta S$ True entropy is $\Delta S = \frac{ -\Delta H }{ T }$ because we end up with solid calcium chloride (s) we know overall the entropy goes down. so in that equation. delta S < 0 $\Delta S < 0$ $\Delta H < 0$

14. Photon336

389 is so tricky the first time I did it i got it wrong

15. Photon336

@taramgrant0543664 thoughts for 389?

16. Rushwr

what's the answer given for 389. I explained one !

17. taramgrant0543664

So I was thinking at first A until I saw that it was in solid form solids don't change rate so I was considering c

18. Photon336

@Rushwr it's C no change

19. Rushwr

oh yes it doesn't count for the K values yes. u are right!

20. Photon336

equilibrium expressions, the K value(s) i think it's pure liquids and solids aren't included.

21. Rushwr

I didn't see the states properly ! Thank you @taramgrant0543664 and @Photon336

22. taramgrant0543664

For it to be counted it's either in gas or aqueous form

23. Rushwr

@taramgrant0543664 I love you!

24. taramgrant0543664

Definitely watch those states that's the thing that always gets me lol

25. Photon336

$Keq = [Cl _{2}]$ $K _{eq} = \frac{ [C][D] }{ [A][B] }$

26. Photon336

yeah... that one got me too..

27. taramgrant0543664

Was the answer for 388 said? I might have missed that I know I missed part of your conversation since I got tagged in the math section

28. Photon336

it remains the same because the Keq depends only on the concentration of the gas chlorine.

29. Photon336

so it's C

30. taramgrant0543664

Right I was thinking that but thought I would double check as sometimes I am completely off on them lol what's the next one?

31. Photon336

387. A. because like replacing a strong acid with a weak one in that reaction would cause the temperature change to rise to a smaller degree, and the enthalpy change would be less.

32. Photon336

I just gave an answer for 387, so all that's left is 386

33. Photon336

I will post one more set of questions then I g2g

34. Rushwr

okai !

35. Rushwr

Btw Thanks alot @Photon336

36. Photon336

386 I missed that one

37. taramgrant0543664

These are kind of fun to do @Photon336!! As for 386 I was considering D as my option possibly?

38. Rushwr

IKR this is awesome ! @taramgrant0543664 @Photon336

39. Photon336

Yeah it's D.

40. Photon336

ok Will post one more.