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Topic: Hello (chemical principles and kinetic-molecular theory)  (Read 3350 times)

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Offline dzdzd

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Hello (chemical principles and kinetic-molecular theory)
« on: December 26, 2013, 02:27:47 PM »
Hi all,
Can you help me with these questions? I'll include the answers that I know.

Use your knowledge of chemical principles and kinetic-molecular theory to explain the following statements.

a.) A lit candle placed in a sealed jar will not burn for very long.
The candle needs oxygen, and sealing a jar with a candle in it will use up all of the oxygen.
b.) A glass of water left out in air can completely vaporize, although the
temperature never comes close to the boiling point of water.
The gas "wants" to spread out to less densely- packed areas (is this diffusion?)
c.) The volume of a gas-filled balloon placed underwater at a constant temperature will decrease as its depth below the surface of the water is increased.

d.) As the temperature of a gas is decreased, the measured pressure of the gas becomes less than the pressure predicted by the ideal gas law.

Edit:
changed heading to be more meaningful
« Last Edit: December 26, 2013, 04:44:13 PM by billnotgatez »

Offline billnotgatez

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Re: Hello (chemical principles and kinetic-molecular theory)
« Reply #1 on: December 26, 2013, 04:47:20 PM »
Forum rules require you show some work for each question
Just doing a few questions and ask people to assist other questions is not fair
Please read forum rules

Offline mkurek

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Re: Hello (chemical principles and kinetic-molecular theory)
« Reply #2 on: December 27, 2013, 12:05:13 AM »
Ah for question c, why don't you think about divers. What happens to divers as they swim deeper and deeper?

How might this effect on divers also effect a balloon?

Offline dzdzd

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Re: Hello (chemical principles and kinetic-molecular theory)
« Reply #3 on: December 27, 2013, 10:44:13 AM »
Forum rules require you show some work for each question
Just doing a few questions and ask people to assist other questions is not fair
Please read forum rules
Didn't I show some work? Thank you for letting me know, though :)

Offline dzdzd

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Re: Hello (chemical principles and kinetic-molecular theory)
« Reply #4 on: December 27, 2013, 10:47:14 AM »
Ah for question c, why don't you think about divers. What happens to divers as they swim deeper and deeper?

How might this effect on divers also effect a balloon?
The pressure gets greater, right? Would a balloon burst?

Offline billnotgatez

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Re: Hello (chemical principles and kinetic-molecular theory)
« Reply #5 on: December 28, 2013, 07:24:16 AM »
@dzdzd
From memory I think 1 cc of water is 1 gram.

Well depends on how you define burst
I would guess the balloon would rupture as it descended.
My GOOGLE powers did not give me confirmation.

did you think about question d

Offline Borek

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Re: Hello (chemical principles and kinetic-molecular theory)
« Reply #6 on: December 28, 2013, 09:40:48 AM »
Descending balloon won't neither burst nor rupture, despite the pressure getting higher.

What happens to the volume when the pressure goes up?
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