Changes of State
Evaporation
Liquid changes to gas
Solids have no energy?
False- they have little vibrations
What is density?
mass per unit volume
Equation with the units?
Change in energy = mass x latent heat
J, kg, J/kg
What is SHC? The amount of energy needed to raise the.....of 1kg......by..
The amount of energy needed to raise the temperature of 1kg object by 1 degree
Condensation
Gas changes to liquid. Particles lose energy
3 properties of a liquid?
- Random arrangement, little space in between, some energy levels, fixed volume, no fixed shape
Density equation with units?
Density = mass x volume.
Kg/M2, kg, M2
What is latent heat? The amount of heat needed for a substance to....
Change state
SHC equation with units?
energy transferred= mass x SHC x temp change
J, kg, J/KG, degrees cel
Freezing point of water
Zero degrees
Describe the structure of gas
Lots of space between particles, randomly arranged, no fixed shape or volume, less dense than solid and liquid
Measure the density of an irregular object?
Measure the mass of the object, place in a eureka can full of water, then place in a measuring cylinder.
What is internal energy? The total ___and ____in an object
Kinetic ad potential
Name 3 pieces of apparatus we used in the SHC practical
power pack, thermometer, insulation, heat immerser, ammeter, metal mass
Melting
Particles gain energy and break from their fixed shape
Which state is compact and has strong electrostatic forces between them?
Solid
Who is the eureka can named after?
Archimedes
What is the difference between heat and temperature?
Why was insulation used on the block?
Retain heat in the block and make sure it's fair
Does temperature change during a change of state?
No
Why does ice melt when it is in water?
Why do some objects float or sink in water?
If an object is denser than water it will sink. If it is less dense, it will float
Draw a heating graph labelling solid liquid gas. Label your graph
Amin will judge your graph
Why Why do we get a cold breeze near the sea when the sand is hot?
Sand heats up quicker than water, heat rises creating low pressure. Cold breeze from the sea is high pressure and moves in towards the land