Your Questions About Cleansing Diet

Linda asks…

Why do solids melt into liquids and liquids boil into vapors as the temperature is increased?

2.Why do vapors condense into liquids and liquids solidify as the temperature is decreased?
Please help and thank you so much.I really appreciate it.I don’t really understand these questions and we never reviewed this in class.Any answer(s) with this would help me.Thanks again.

Marshall Leclair answers:

The easiest way to explain it is that it has to do with the arrangement of the atoms/molecules. In the solid phase the molecules are packed the tightest, liquid in the middle, and gas farthest apart. At the same time the solid phase is the lowest energy as the molecules are packed close and do not move about, while in the gas phase they move freely and have the highest energy. When you increase the temperature you increase the energy in the phase and it begins to transition into the next phase, i.e., solid into liquid, liquid into gas. Different compounds have different points at which they will transition into the next phase. Also temperature is not the only factor that affects phase transition, changing the pressure can allow you to boil a liquid at room temperature.

Mary asks…

What are the rules about liquids on a plane?

I haven’t flown before and I’m confused by the rules so I though I would ask this direct question… I’m taking my suitcase as hold luggage and my handbag as my hand luggage but my question is about liquids. Do all liquids have to be declared in a re-sealable plastic bag or just hand lugguage? If I didn’t want it in my hand lugguage could I just pack my liquids (Shampoo, body wash, makeup) into my hold baggage without any special requirements?

Marshall Leclair answers:

The liquid rules are only for CARRY ON (HAND) LUGGAGE.
The rules are…
-3.4oz (100ml) containers or smaller
-all containers must be placed in a 1 quart size clear plastic zip top baggie
-only 1 baggier per person
you need to take the baggie out during security and place it in a bin provided to you for it to go through the x-ray machine.

Again the liquids rule is NOT for checked (hold) luggage.
You can have as many liquids in any size and it does not have to be in a plastic baggie in your checked (hold) luggage.

Ken asks…

Which of the following liquids would have the lowest vapor pressure?

Which of the following liquids would have the lowest vapor pressure?

A) CH3CH2OH
B) CH3OCH3
C) CH3CH2CH3
D) HOCH2CH2OH

Can someone please explain the strategy to figure out what has higher or lower vapour pressure? Thanks!

Marshall Leclair answers:

Answer is D.

You can use two approaches:

Qualitative: The compound with the strongest intermolecular forces will have the lowest vapor pressure, since the forces that hold the molecules together in the liquid tend to keep it from evaporating. A and D both can form hydrogen bonds, but D can form hydrogen bonds at both ends of the molecule.

Look up the boiling point. The compound with the highest boiling point will have the lowest vapor pressure at a given temp.

Lizzie asks…

What gasses or Liquids expand and contract a large amount with slight temperature variations?

I’m trying to figure out what gasses and/or liquids expand a lot to slight temperature variations. if anyone can help, I would greatly appreciate it!

Thanks!

Marshall Leclair answers:

You really need to specify the pressure and temperature conditions over which you need this fluid to operate. In addition, if you are thinking of using this fluid in some sort of practical device, thenI suspect there will be other properties of the fluid that will need to be considered (e.g., melting point, boiling point, vapor pressure of the liquid, chemical stability, toxicity, flamability, etc.).

Assuming you are interested in conditions near “normal” temperature and pressure conditions for the Earth’s surface, then nearly all gases will behave more or less like ideal gases, and have very similar coefficients of thermal expansion, which is defined as 1/V * dV/dT, where the derivative is a partial derivative.

The ideal gas law is V = n*R*T/P, so

dV/dT = n*R/P

1/V = P/(n*R*T), so

(1/V)*dV/dT = [P/(n*R*T)]*n*R/P = 1/T

The volumetric coefficient of thermal expansion of all gases that behave ideally is simply 1/T (where T is expresed in kelvins).

As for liquids, alkanes like pentane and gasoline (a mixture of octane and other linear and aromatic hydrocarbons) have fairly high volumetric thermal expansion coefficients, as do acetone and diethyl ether, but these havea low boiling points and rather high vapor pressures as a liquid. You could also take a hint from old-fashioned liquid-in-glass thermometers, which typically use mercury or alcohol (ethanol or methanol). All these liquids have thermal expansion coefficients about 5-7 times larger than that of liquid water.

William asks…

Chemistry question: Why are molecules of liquids harder than molecules of solids?

Why are the molecules of liquids harder than the molecules of soilds? Could you plz explain to me?

Marshall Leclair answers:

Http://ca.answers.yahoo.com/answers2/frontend.php/question?qid=20071206175014AAGdXqn

Molecules of liquids are higher in energy because they’re moving faster…. Harder? What does that mean men? No one has actually measured the hardness of a molecule.

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