Ch - 9 (The Kinetic Model of Matter)

Question 1

What are properties of solids?

Answer 1

• Definite shape
• Definite volume
• do not flow
• Cannot be compressed

Question 2

What are properties of liquids?

Answer 2

• No definite shape
• definite volume
• can flow
• cannot b compressed

Question 3

What are properties of gases?

Answer 3

• No definite shape
• No fixed volume
• Flow
• Compressible

Question 4

What changes when the state changes?

Answer 4

energy n reversible

Question 5

What happens when particles gain energy?

Answer 5

Gain kinetic energy

Question 6

what is the relation between temperature and pressure?

Answer 6

As temp increases, pressure increases.

Question 7

What is absolute zero temp?

Answer 7

Particles are no longer moving and do not collide with the container.

Question 8

What is the value of absolute zero temp ?

Answer 8

• 273°C or K (Kelvin)

Question 9

How do particles of gas move around?

Answer 9

Random motion.

Question 10

What does it mean if particles travel in random motion?

Answer 10

no specific path

Question 11

When are there sudden changes in the movement of gas particles?

Answer 11

• walls of its container
• other molecules.

Question 12

How is pressure in a gas caused in a container?

Answer 12

by the collisions with the surface of the container walls.

Question 13

What is the formula for pressure?

Answer 13

P = F/A

Question 14

What does the Kinetic Theory of Matter state?

Answer 14

All matter is made up of tiny particles

Question 15

What is Brownian motion?

Answer 15

The random movement of particles in a liquid or a gas is produced by large numbers of collisions with smaller particles that are hard to see.

Question 16

What do we see through a microscope when particles of pollen or smoke are observed?

Answer 16

sec of light, moving randomly in a jerky motion.

Question 17

What can be seen when we look through a microscope?

Answer 17

Microscopic particles such as :

• Pollen or smoke particles seem to move
• Smaller atoms and molecules

Question 18

What does the collision give particles?

Answer 18

Lil nudge to change the speed and direction randomly each time they are struck.

Question 19

Where does the presence of light of fast-moving particles and molecules come from

Answer 19

inferred from the motion of the microscopic particles

Question 20

What does the absolute temperature begin at?

Answer 20

kelvin temp scale

Question 21

What is 0 K equal to?

Answer 21

-273°C

Question 22

Is it possible to have temp lower than 0K

Answer 22

No, so there is no negative value

Question 23

Define Temperature.

Answer 23

Average KE of the molecules in a substance.

Question 24

Define internal energy

Answer 24

Total sum of KE and PE of molecules in a substance.

Question 25

What causes brownian Motion of dust particles?

Answer 25

Dust particles are constantly knocked about by the fast moving particle of the air.

Question 26

What are the particles called?

Answer 26

Air molecules

Question 27

When can the gas laws be considered?

Answer 27

Temp of gas is constant

Question 28

What happens when temp is constant and if the container is compressed?

Answer 28

volume decreases pressure increases

Question 29

What happens when temp is constant and if the container expands?

Answer 29

volume increases Pressure decreases

Question 30

What can be used to remove air ins sealed container?

Answer 30

Vacuum pump

Question 31

What happens when gas is compressed?

Answer 31

- Molecules hit the wall of the container frequently - Creates overall net force

Question 32

When there is a constant volume, what happens when temp increases?

Answer 32

Average energy of particles increases

Question 33

When does Booyle's Law apply?

Answer 33

Of temp T of an ideal gas is constant

Question 34

What is the formula for Booyle's law ?

Answer 34

P inversely proportional to 1/V

Question 35

What is the relationship between pressure and volume?

Answer 35

P1V1 = P2V2 1 - initial 2 - final vol = m^3 p = pascals