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(a) How does the average kinetic energy of molecules compare with the average energy of attraction between molecules in solids, liquids, and gases? (b) Why does increasing the temperature cause a solid substance to change in succession from a solid to a liquid to a gas? (c) What happens to a gas if you put it under extremely high pressure?

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Beverley Smith
Beverley SmithLv2
25 May 2020

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Related questions

To understand the kinetic molecular descriptions of solids, liquids, and gases.

The following table gives information about the behavior of molecules in solids, liquids, and gases.

Solid Liquid Gas
Density high high low
Molecular movement
(with respect to one another)		 minimally slow fast
Compressibility and
thermal expansion		 fixed
volume		 fixed
volume		 variable
volume
Do they expand to fill their container? no no yes
Do they take the shape of their container? no yes yes

Part B

Consider equal volumes (say 1 L) of a given substance in the solid, liquid, and gas phases. Arrange them in order of decreasing mass based on the trend for the average substance. If the mass difference between samples is relatively small (10%or less), rank the items as equivalent.

Rank from greatest to least mass. To rank items as equivalent, overlap them.

1L of substance in the solid phase, 1L of substance in the liquid phase, 1L of substance in the gas phase

Greatest Mass Least Mass

Part C

Match each description to the appropriate phase of matter.

A substance with a fixed volume and fixed shape

A substance with no fixed volume or shape

A substance with a fixed volume and no fixed shape

Solid Liquid Gas


If temperature increases, vapor pressure _______________ (increases/decreases)? Why?

If temp increases, Kinetic energy of molecules increase. Molecules in high-energy tail of the distribution that have kinetic energies greater than the attractive force between molecules in the condensed (liquid or solid) phase also increases. I have got both answers, some say vapor pressure increases & some say it decreases.
An increase in vapor pressure makes sense than a decrease if temperature rises. But please explain which one is true and how ?

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