Question

can anyone help me with an online quiz? its all on thermochemistry basics? PLEASE HELP

Answer 1

are we supposed to guess what these questions you have are?

Answer 2

hey sorry I was looking for osmeone to be online

Answer 3

anyone online to help?
@aaronq

Answer 4

I have 40 mins to take the quiz and it is 25 questions @aaronq

Answer 5

aaron are you good with thermochemistry?

Answer 6

i can help you work through them by giving you hints and explanations, but can't give you direct answers (or any answers at all)

Answer 7

I havent studied well for it yet and it is timed for 40 minutes, its an online quiz...... so help would be great..

Answer 8

you should wait then and study a bit more. no point of taking it without studying, right?

Answer 9

yea, can you help me in explaining some question to me? for studying I have practice problems

Answer 10

sure thing

Answer 11

are you familiar with 5 step problems?

Answer 12

calculate the energy invovled when 6g of -5C ice changes to steam at 110C

Answer 13

Okay, so this involves 5 calculations.


this is the temperature/heat curve for the process.

you need to use two general equations

1. \(q=m*C_p*\Delta T\)

2. \(q=m*H_{fusion~or~vaporization}\)

then add all these heat values together

Answer 14

Use the necessary specific heat capacities and enthalpies of fusion/vap

Answer 15

yes I'm familiar with those equations and graph and I'm not 100% confident with understanding that graph, out teacher explained in class, but I wasn't smrt enough to understand what she was saying about it

Answer 16

Whenever there is a change in temperature you use the first equation, and when there is not change in temperature (that is a change in phase only) you use the second.

Answer 17

whats the difference between temp change and phase change? @aaronq

Answer 18

in the first youre changing the temperature of the matter (e.g. ice warming up, water warming up) and the phase change youre changing the physical state of the matter (solid to liquid, liquid to gas).

Answer 19

oh ok go ahead @aaronq

Answer 20

with?

Answer 21

the problem

Answer 22

i just did..

Answer 23

lemme post again

Answer 24

calculate the nergy involved when 6.0 grams of -5C ice changes to steam at 110C

Answer 25

the C are degree celcius

Answer 26

yeah and i just explained how to do it

Answer 27

oh, can you explain with numbers and calculations?

Answer 28

how about you try the first step, then i'll tell you if you're doing it right?

Answer 29

all the information is on the graph i drew

Answer 30

ok how do I know where to start and where to end?

Answer 31

all the information is on the graph i drew

Answer 32

working on it

Answer 33

so for the first step, the change is from -5 to 0.

Answer 34

yup using the first equation

Answer 35

and the specific heat capacity of ice, right?

Answer 36

make sure to post your work here, not just the answer