chp 13 test

Question 1

physical characteristics of gases

Answer 1

gases have mass

gases will assume the volume and shape of their containers

gases are the most compressible state of matter

gasses will diffuse: they mix evenly and completely when confined to the same container

gases have much lower densities than liquids and solids

gases exert pressure and the pressure depends on temperature

gases are fluids- they flow

Question 2

a gas is composed of small molecules that are separated from each other by large differences

Answer 2

explains: c e

Question 3

gas molecules can be considered to be points; that is, they posses mass but have negligible volumes

Answer 3

explains: a

Question 4

gas molecules are in constant, rapid motion in random directions, and they frequently collide with one another. collisions among molecules are perfectly elastic

Answer 4

explains: d f g

Question 5

gas molecules are neither attractive or repulsive forces in one another

Answer 5

explains b c d e g

Question 6

average kinetic energy of the molecules is proportional to the temperature of the gas

Answer 6

explains: f

Question 7

relationship between volume and pressure

Answer 7

if the volume increases, the pressure decreases because if particles have more room, they will collide the the container less often

the volume and pressure of a fixed mass of gases vary inversely at constant temperature

Question 8

relationship between volume and temperature

Answer 8

if the temperature increases, the volume increases because the gas particles have more energy and move faster

the volume and temperature of a fixed mass of a gas vary directly at constant pressure

Question 9

relationship between pressure and temperature

Answer 9

if the temperature increases, pressure increases because the particles have more energy and collide more often with their containers

the pressure of a fixed mass of a gas varies directly with the temperature at constant volume

Question 10

ideal gas

Answer 10

a gas that completely fulfills all the assumptions of the KMT

Question 11

why are gases not ideal?

Answer 11

real gas particles take up space

real gas particles exhibit slight attractive forces

Question 12

when do real gases get close to ideal?

Answer 12

at high temperatures and low pressure

Question 13

to achieve a gas with a low density:

Answer 13

heat the gas

select a gas with a low molar mass