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What happens when a gas is heated?
This question seems obvious but the real meaning I am trying to exploit is difficult (for me). I was asked this question in advanced chemistry. It seems easy but I don’t remember this covered material. Can anyone help me? Thanks, help is much appreciated. :)
When a gas is heated_.
A) all of the absorbed thermal energy is converted to kinetic energy. B) all of the absorbed thermal energy is converted to potential energy C) some of the absorbed thermal energy is converted to the internal energy of the gas
particles, and some is converted to kinetic energy.
D) one-half the absorbed thermal energy is converted to potential energy and the other half is
converted to kinetic energy.
The molecules become “excited” and start to move around more and spread out..
Or at least im pretty sure that’s what happens.
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which answer would that be then…? A, B , C, or D?
The molecules spread out and move faster then gets less dense and move up to cooler air/gas
I guess it should be C.
If you heat a gas, then the molecules get moving faster. That is internal energy of the gas. That’s basically the definition of temperature when it comes to physics. It’s how fast the molecules of a substance move. Heat makes them move.
The microwave works the other way round. Water molecules have a “polarity”. They have a slightly positive charge on the hydrogen ends and a slightly negative charge on the oxygen end. So the microwave does extremely quickly changing magnetism fields, that “shake” the water molecules. The molecular movement then creates heat.
But back to your gas: As the molecules also use more space as they move faster, the substance “pushes outward” that would be kinetic energy. That’s why spray cans or lighters can explode when they get too hot.
A good example of this would simply be a hot air baloon. As you heat the air (gas) inside, the molecules, spred out, move faster and overall the whole quantity gets less dense, and thus moves up through the cooler air outside.
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