homework for november 11

Objective 1

1 mass is more usefull because weight changes depending where you are and mass always stays the same
2 619.65 cm cubed is the volume
3 commonly used units for density are grams over cm cubed or Pa which are really grams over ml cubed
4 d= m over v
5 v=l x w x h

Objective 2
1 the difference between a chemical change and a physical change is that during a chemical change the substance's chemicals change but during a physical change the substance's chemicals stay the same
2 spontaneous, heat, light, and energy
3 mass is constant
4 temperture is similar to energy but isnt actually energy
5 endothermic reactions create cold and exothermic reactions create warmth

Objective 3
1 chemical energy the atoms are sharing electrons
2 a skateboard rolling down the street has kinetic energy
3 a pencil sitting on a table has potential energy
4 electromagnetic energy has to do with waves
5 electrons moving is electricity

Objective 4
1 particles that are warm move fast and particles that are cold move slow
2 the ice cream changes states of matter it starts to absorb the heat
3 when heat is added particles vibrate when the particles are cool they vibrate only a little
4 condensation happens when hot and cold air come together
5 Sublimation happens when a solid changes to a gas

Objective 5
1 Boyle's law  when volume goes up pressure goes down and the other way around
2 lower pressure would cause the ballon to burst
3 PV=K
4 breathing in increases the volume of the lungs
5 when the diver goes deeper the pressure increases Boyle's law states as pressure increases volume will go down