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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: dzdzd on December 26, 2013, 02:27:47 PM

Title: Hello (chemical principles and kinetic-molecular theory)
Post by: dzdzd 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
Title: Re: Hello (chemical principles and kinetic-molecular theory)
Post by: billnotgatez 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
Title: Re: Hello (chemical principles and kinetic-molecular theory)
Post by: mkurek 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?
Title: Re: Hello (chemical principles and kinetic-molecular theory)
Post by: dzdzd on December 27, 2013, 10:44:13 AM
Quote from: billnotgatez 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
Didn't I show some work? Thank you for letting me know, though :)
Title: Re: Hello (chemical principles and kinetic-molecular theory)
Post by: dzdzd on December 27, 2013, 10:47:14 AM
Quote from: mkurek 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?
The pressure gets greater, right? Would a balloon burst?
Title: Re: Hello (chemical principles and kinetic-molecular theory)
Post by: billnotgatez 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
Title: Re: Hello (chemical principles and kinetic-molecular theory)
Post by: Borek 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?