particle model of matter

Question 1

measuring density of regular shaped object

Answer 1

measure the mass using a balance
measure the length width and height with a ruler
calculate the volume
use density P=m/V equation to calculate density

Question 2

measuring density of irecgular shape require practicle

Answer 2

measure mass using a ballance
fill a eureka can with water
place object int the water the water displaced by object will transfer into a measuring cylinder
measure volume of water this equals the volume of the object
use density P=m/V equation to calculate density

Question 3

solids

Answer 3

have strong force of atraction they are held together very closley in a fixed regular arrangement the particles do not have much energy and can only vibrate

Question 4

liquids

Answer 4

have weaker forces of attraction they are close together but can move past eachother they form irregular arrangements they have more energy than particles in a solid

Question 5

gasses

Answer 5

have almost no forceof attraction between the particles they have the most energy and are free tomove in random directions

Question 6

gas particles

Answer 6

canmove around freely and will colide with other particles and walls of the container this is the pressure of the glass

if the temperaturee of the gas increases then the pressure wioll be bale toincrease. the hotter temp more kinetic energy they move faster coliding witrh sides of container more oftrren

Question 7

internal energy

Answer 7

particles within a system have kinetic energy when they vibrate or move around particles also have potentialenergy store. the total internal energy of a system is the kinetic and potential energy stores

Question 8

what happens to internal energy temp

Answer 8

if the system is heated the particles will gain morekinetic energy as increasing internalenergy

Question 9

changing in state

Answer 9

if system gains more energy lead to changein tempor state sysem heated enough to break bonds
when somthing changes state their is no chemical change only physical

Question 10

specific latent heat is

Answer 10

the amount of energy needed to change 1kg of a substance from one state to another without changing temp

Question 11

specific latent heat equation

Answer 11

energy=mass X specific latent heat L E=mL