Question

worksheet: episode 901 review
name nly shula

1. the theory that explains the behavior of gases at the molecular level is called the ____ which is based on assumptions about a theoretical gas often referred to as an ____
2. gases deviate most from ideal gas behavior under conditions of very low ____ and very high ____.

--the molecules of an ideal gas display no ____ or ____ for one another.
--under ordinary conditions, an ideal gas consists chiefly of ______ space, which explains why gases are so easily compressed.
-- ideal gas particles travel in ______ lines until they collide with each other or with the walls of their container.
--the collisions between the molecules of an ideal gas are completely ______.
--the average kinetic energy of the molecules of an ideal gas is ____ proportional to the ____ temperature of the gas.

1. a gas exerts pressure on the walls of its container because gas molecules ______ with the walls of the container. so, the pressure exerted by a gas depends on two factors:

a)
b)

1. to measure gas pressure an instrument called a ______ is used.
2. the earth’s atmosphere has weight, which creates ______
3. the instrument used to measure atmospheric pressure is the ______

Explanation:

1. The kinetic - molecular theory of gases explains gas behavior at the molecular level, assuming an ideal gas.
2. Gases deviate from ideal behavior at low temperature and high pressure. Ideal gas molecules have no attraction or repulsion, move in straight lines, have elastic collisions, and average kinetic energy is proportional to absolute temperature.
3. Gas pressure is due to molecule - wall collisions, depending on the number of collisions and force of collisions.
4. A manometer measures gas pressure.
5. The weight of the Earth's atmosphere creates atmospheric pressure.
6. A barometer measures atmospheric pressure.

Answer:

1. kinetic - molecular theory of gases; ideal gas
2. temperature; pressure; attraction; repulsion; empty; straight; elastic; absolute
3. collide; a) the number of collisions with the walls; b) the force of the collisions with the walls
4. manometer
5. atmospheric pressure
6. barometer