Question

B?

Answer 1

work is 80, Qin is the heat taken in which is 400, calculate e = W/Qin

Answer 2

OH A

Answer 3

good

Answer 4

D

Answer 5

good

Answer 6

C

Answer 7

well done

Answer 8

A

Answer 9

good

Answer 10

D

Answer 11

good

Answer 12

A

Answer 13

remember the sign convention for the equation

U = Q - W

a negative W-value would imply work is being done on the system which would increase the internal energy

Answer 14

SO B

Answer 15

Q still needs to be negative for the system to lose energy (heat)

Answer 16

Oh okay so c

Answer 17

well done

Answer 18

A

Answer 19

keep in mind latent heat of fusion has to do with the energy required to cause melting and the problem does not specify that the wood/water is undergoing fusion, just a temp change

what would cause water molecules to resist changes in temperature more than wood does?

Answer 20

um either c or d then right

Answer 21

C

Answer 22

good, and since water resists temperature change are the intermolecular forces stronger or weaker?

Answer 23

stronger

Answer 24

good so D

Answer 25

D

Answer 26

hm, I think there's a better answer, it has to do with entropy, does entropy increase or decrease over time?

Answer 27

right it decreases

Answer 28

A

Answer 29

entropy increases [this is pretty imporant to remember] so the system becomes more disordered or "spread out" [bad phrasing imo] so B

Answer 30

OH okay i will remember

Answer 31

either b or c

Answer 32

well the endothermic part is right, this is just a matter of memorizing whether endo means energy is being absorbed or if its being released, any ideas/or guesses?

Answer 33

absorbed

Answer 34

awesome so c

Answer 35

B

Answer 36

20-60

Answer 37

good

Answer 38

D

Answer 39

I'm not 100% sure on this one but since conduction requires contact between atoms I'm tempted to say solid b/c the atoms are closer together

https://www.enotes.com/homework-help/what-state-matter-conduction-convection-take-place-707689

Answer 40

OKay!

Answer 41

C

Answer 42

awesome

Answer 43

D

Answer 44

because we just went over entropy being scattered?

Answer 45

well you're on the right track but since they want the lowest entropy we would want to avoid the shuffle option because that creates disorder

honestly i'm stuck between playing a single song vs playing all the songs in alphabetical order because in both these scenarios there's only one way to play it

Answer 46

well it says lowest entropy so maybe

Answer 47

A

Answer 48

after some research/deliberation I am leaning more towards c because the single song system has 1 ordered state out of all states, whereas the alphabetical list has 1 ordered state out of many disordered states representing a higher level of order relative to all possibilities

Answer 49

D

Answer 50

awesome

Answer 51

A

Answer 52

hm. thermal energy itself would be Q but chemical + thermal = internal = what symbol?

Answer 53

well w is work

Answer 54

good so there's only one letter left, U = internal energy = your answer

Answer 55

B

Answer 56

the products have higher energy so energy must be absorbed, making the process..?

Answer 57

C

Answer 58

well done

Answer 59

D

Answer 60

awesome

Answer 61

C

Answer 62

good

Answer 63

C

Answer 64

good