Question

Please Help :(

You are getting out of the car as you finish the cold water that is in your water bottle(as shown above). You reseal the lid and leave it on the seat of the car, closing and locking the door. The empty water bottle is resting on the seat directly in the hot sun. It is several hours before you return to the car. Will any of the following change in this scenario? Justify your prediction a) Volume of the water bottle? b) Temperature of the water bottle? c) Pressure inside the water bottle?

Answer 1

https://lh4.googleusercontent.com/GDLp01Zd2p5_iwb3w1jV5BDzmt9TmjnAU1wwCL2-OSV4qAU-PxrC6iD4FnoDWkcVAenU1w

Answer 2

@imqwerty
@retirEEd
@sweetburger

Answer 3

a) Volume of the water bottle?
this depends of how rigid it is the bottle and how tightly the bottle is capped.

b) Temperature of the water bottle?
directly in the hot sun... I will assume that the temperature will rise at least if you left also the AC on in the car.

c) Pressure inside the water bottle?
this depends of how rigid it is the bottle and how tightly the bottle is capped. If the bottle is soft like a balloon it can increase the volume and not change the pressure, if the bottle is solid and highly tight the pressure will increase and if it is too much can explote. If the bottle is loosely taped, neither pressure neither volume will change, just the density of the contents will change

Answer 4

How about the second one?

Answer 5

"On a warm summer day Mrs. Parker placed some flowers in a zippered sandwich bag and sealed it with enough air to provide protective air space for the flowers. She then placed the sealed bag in the refrigerator to keep the flowers cool. Describe what happened to the bag as it cools in the refrigerator. Why does this happen? *"

Answer 6

@JoannaBlackwelder ?

Answer 7

In regards to your first question when heat increases the number of molecules inside the liquid with enough energy to break through surface of the liquid and become gas molecules increases. This results in an increase in pressure above the surface of the liquid and inside of the bottle.

Answer 8

These questions are not really taking into consideration the rigidness of the bottle. Its probably a general chemistry question not a course about polymer durability.

Answer 9

@sweetburger This is the problem with this kind of "everyday" questions in a general chemistry class. If they expect you to get conclusions in a simple variable, so they have to provide a system with a simple variable, they can not leave open ended questions and expect a simple answer.
I will said this is kind of an open end question and is challenging the student to come out with new ideas, not just with pre fixed answers. If you don't want to consider the rigidness of the bottle it is totally fine and you are free to do it it and also you can said that the gas inside the bottle is behaving as a ideal gas and you can said that the bottle reseal the lid was tight enough to avoid any gas to enter or escape the bottle, and you can assume that the several hours it is 6-10 hs and you come back in the middle of the night. And many more fixed variables as you like. I dont think in this case there is a simple correct answer. Nothing said the problem about the outside temperature, neither said if the car is parked in a summer parking-lot in Florida or a winter forest near Ontario, the temperature outside the car can be 80F or -20F. After several hours anything can happened.

Answer 10

I don't disagree with you on anything you said. Your explanations were completely valid.