Summary P3 Particle model of Matter

P3 Particle model of Matter
Density
 Measure of ‘compactness’ of a substance
 Relates the mass of a substance to how much space it takes up
(i.e. volume)
 Depends on what substance it is made of and how the particles
are arranged
 DENSE MATERIAL- particles packed tightly
 LESS DENSE- more spread out particles
 If you compress a material, its particles would move closer
together and become less dense
 When compressing, mass stays the same but volume changes

Solids
 Strong forces of attraction, close together in fixed, regular positions
 Particles vibrate in fixed positions
 Highest density out of all of them

Liquids
 Weaker force of attraction
 Free to move past each other but stick closely together
 Irregular arrangement
 Move in random directions at slow speed

Gases
 No Force of attraction
 Less dense
 Move in random directions at high speeds
 Lots of energy

Measuring Density Practical
 For an irregular solid
1. Fill eureka can with water and submerge solid, collecting the water in a measuring cylinder
2. Record volume in measuring cylinder and use DMV to find density
 Density of a liquid
1. Put a measuring cylinder on a balance and make the balance 0
2. Place 10ml of liquid and measure the mass and calculate the density (1cm 3= 1ml)
3. Add another 10ml and calculate
4. When done, take average of calculated densities