models- kpc

Question 1

change of state

Answer 1

conversion from one physical state to another, usually by a change in the energy of the particles in the substance

Question 2

melting

Answer 2

process whereby a solid turns into a liquid at its melting point

Question 3

boiling

Answer 3

process by which a liquid turns into a gas at its boiling point

Question 4

condensation

Answer 4

process by which a gas turns into a liquid

Question 5

freezing

Answer 5

process by which a liquid turns into a solid

Question 6

sublimation

Answer 6

process by which a solid turns directly into a gas without melting

Question 7

matter

Answer 7

anything that has mass and take up space

Question 8

model

Answer 8

a physical/mathematical/conceptual representation of a system,object,event or process

Question 9

mass

Answer 9

the amount of matter a substance has

Question 10

weight

Answer 10

force of gravity acting on an object

Question 11

kinetic particle theory

Answer 11

kpc states that all matter is made up of tiny particles that are in constant random motion and constantly collide with one another

can be used to explain the 3 states of matter in terms of their properties and the interconversion and energy changes between the 3 states

Question 12

solid

Answer 12

particles of solid are closely packed in an orderly pattern with very little space between them
they vibrate and rotate about their fixed positions
their energy level is low
definite shape as particles cannot move about freely
fixed volume as particles are closely packed and there is little/almost no space bewtween particles

Question 13

liquid

Answer 13

loosely packed in a disorderly manner, with slightly more spaces between them than in a solid
they slide over one another
energy level is moderate
no definite shape, but takes the shape of container as particles are able to move about
fixed volume as particles are closely packed and there is little space between particles

Question 14

gas

Answer 14

particles are very far apart from one another in a disorderly manner
moves rapidly and freely in all directions
energy level is high
it has no definite shape and takes the shape of the container as particles are able to move about
no fixed volume as gases can be compressed
there are large spaces between particles hence particles can come closer together or move further away

Question 15

evaporation

Answer 15

involves the change from liquid to gas
1. occurs at surface only bc liquids at surface have more energy
2. occurs below boiling point

Question 16

boiling

Answer 16

involves the change from liquid to gas
1. occurs throughout the liquid and bubbling is observed
2. only occurs when temperature reaches boiling point