Particle Model of Matter

Question 1

what is density?

Answer 1

mass per unit volume

Question 2

density equation

Answer 2

p=m/V

Question 3

characteristics of solid particles

Answer 3

• strong forces of attraction between particles
• tightly packed
• vibrate in a fixed position = low
  energy
• regular arrangement

Question 4

characteristics of liquid particles

Answer 4

• weak forces of attraction between particles
• close together
• particles flow over eachother
• irregular arrangement
• move in random directions at low speeds = medium energy

Question 5

characteristics of gas particles

Answer 5

• neglible forces of attraction between particles
• move quickly in random directions = high energy
• irregular arrangement

Question 6

what is potential energy?

Answer 6

forces between particles

Question 7

what is internal energy?

Answer 7

total energy that particles have in their kinetic and potential stores

Question 8

what happens to the particles in a substance when its heated?

Answer 8

they gain enough kinetic energy to break their bonds

Question 9

what is mass?

Answer 9

amount of matter

Question 10

what is volume?

Answer 10

space a 3D shape takes up

Question 11

changes of state

Answer 11

solid to liquid - melting
liquid to gas - boiling
solid to gas - sublimation
gas to solid - deposition
gas to liquid - condensation
liquid to sold - freezing

Question 12

what is specific latent heat?

Answer 12

The specific latent heat of a substance is the amount of energy
required to change the state of one kilogram of the substance with
no change in temperature.

Question 13

what is specific latent heat of fusion?

Answer 13

amount of energy needed to change 1kg of a solid to 1kg of a liquid at its melting point

Question 14

what is specific latent heat of vaporiastion?

Answer 14

amount of energy needed to change 1kg of a liquid to 1kg of a gas at its boiling point

Question 15

specific latent heat equation

Answer 15

E=mL

Question 16

what is gas pressure caused by?

Answer 16

particles colliding with the surface of a container and exert a force on it

Question 17

why does pressure increase when temp increases?

Answer 17

• temp is the average Ek of particles
• particles have more Ek=move faster
• each impact has more force
• more impacts per second
• total force increases

Question 18

pressure in gases equation
(TEMP HAS TO BE CONSTANT)

Answer 18

p1V1=p2V2
pV= constant

Question 19

pressure in gases

Answer 19

• gases can be compressed or expanded by pressure changes
• pressure produces a force at right angles to the wall of the gas container (or any surface)

Question 20

bike pump questions

Answer 20

Work is the transfer of energy by a force.
Doing work on a gas increases the internal energy of the gas and can cause an increase in the temperature of the gas.