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Characteristics of Particles of Matter

Which one of ...

Question

Which one of the following statements is not true?
(a) the molecules in a solid vibrate about a fixed position
(b) the molecules in a liquid are arranged in a regular pattern
(c) the molecules in a gas exert negligibly small forces on each other, except during collisions
(d) the molecules of a gas occupy all the space available

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Solution

(b) The molecules in a liquid are arranged in regular pattern
The above answer is not true because in liquids the molecules are not arranged in regular pattern. In liquids the molecules are loosely arranged.

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State True or False.

A gas differs from a liquid in that, except during collisions, the molecules of gas are widely separated from each other and move in paths that are largely unaffected by intermolecular force.

Q. When the temperature of a gas sample filled in a container is increased, its pressure increases. Which of the following are the reasons for it?
(a) Gas molecules exert more force on each other than before.
(b) Gas molecules move faster than before and strike the walls of the container more often.
(c) Each impact of the gas molecules on the walls of the container yields a greater force then before.
(d) Impacts are now distributed over a smaller area.

Q. Our model of an ideal gas describes gases as a collection of small, rigid spheres, in constant, rapid motion. Because the molecules are very small compared to the space they occupy, we say the molecules have negligible volume. This mean that molecules are more likely to collide with the container walls than they are to collide with each other.
Nonetheless, intermolecular collisions are possible and do occur. We refer to the distance a molecule can travel without hitting something else as its mean free path.
Which of the following change possibilities would INCREASE the mean free path of molecules in a sample of confined gas, assuming no change in the number of molecules in the system?

Q. The atoms or molecules of a solid are always arranged in a regular pattern. Do you agree? Give reasons.

Q. Statement 1:
The total translational kinetic energy of all the molecules of a given mass of on ideal gas is 1.5 times the product of its pressure and volume.
Statement 2:
The molecules of a gas collide with each other and the velocities of the molecules change due to collision.

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