particulate nature of matter

Question 1

define matter

Answer 1

anything that occupies space

Question 2

experiments that prove particle theory

Answer 2

change in physical states of matter
diffusion
Brownian motion

Question 3

arrangement, movement , shape and compressibility of solid

Answer 3

tightly packed/ close tgt, vibrate at fixed position , fixed and cannot be compressed

Question 4

arrangement, movement , shape and compressibility of liquid

Answer 4

close but irregular, slide past each other, take shape of container , cannot be compressed

Question 5

arrangement, movement , shape and compressibility of gas

Answer 5

far apart, move freely and randomly, takes up shape of container and can be compressed

Question 6

what is sublimation

Answer 6

solid to gas

Question 7

what is used to describe gas –> solid

Answer 7

deposition

Question 8

why does melting point has no increase in temp

Answer 8

heat energy absorbed by particles is used to overcome FOA

Question 9

why is there no decrease when freezing

Answer 9

heat energy which is lost is balanced by heat released when particles attract to each other

Question 10

what is diffusion

Answer 10

random movement of particles from higher concentration region to lower concentration region

Question 11

why does diffusion happen fastest in gas

Answer 11

highest kinetic energy so collide more frequency with more forces
space between gas are largest compared to solid and liquid

Question 12

factors that affect rate of diffusion

Answer 12

temp- particles get more energy when heated and collide with each other more frequent and bounce further
relative mass- particles are lighter and move faster

Question 13

what is Brownian motion and an example

Answer 13

particles move randomly in straight line in all direction due to collision with each other and with other surrounding particle. eg, pollen grains in water

Question 14

what are the 3 types of particles

Answer 14

atoms, molecules and ions

Question 15

what are the key points of kinetic particle theory

Answer 15

a substance can be solid, liquid or gas, and change from 1 state to another, diff characteristics in each state, differences are due to way its particles are arranged and move

Question 16

how do we reverse changes

Answer 16

cooling

particles lose energy and move slowly. when they collide they don’t hv enough energy to bounce away

Question 17

factors that affect gas pressure

Answer 17

temperature - take in heat energy and move faster. hit walls more faster increasing pressure
volume -particles in smaller space hit walls more often

Question 18

what are the differences between boiling and evaporation

Answer 18

boiling happens at a specific temperature but evaporations happens at a range
evaporations only happens at surface while boiling is through out the liquid