practical-changes of state

Question 1

why are changes of state physical changes?

Answer 1

because they are easily reversible

Question 2

what changes in change of state?

Answer 2

the kinetic energy

Question 3

what type of forces do solids and liquids have?

Answer 3

intermolecular forces

Question 4

what forces hold the particles in a solid in their lattice structure?

Answer 4

intermolecular forces

Question 5

what happens if you increase the temperature of a solid?

Answer 5

the particles gain energy in their kinetic store and vibrate more until they overcome the IMF- breaking their rigid structure
the particles have enough energy to move over one another- turning into a liquid

Question 6

what happens when a substance cools?

Answer 6

the particles lose energy and begin to succumb to the pull of the IMF

Question 7

what equipment do you need for this practical?

Answer 7

thermometer
ice cubes
beaker
tripod and gauze
bunsen burner
stopwatch

Question 8

method?

Answer 8

1) place the ice cubes in the beaker
2) place the thermometer in the beaker
3) place the beaker on the tripod and gauze and start to heat it using the bunsen burner
4) as the beaker is being heated, take regular temperature measurements
5) continue this while the substance changes state

Question 9

analysis of results?

Answer 9

plot a graph of temperature (y-axis) against time (x-axis)

Question 10

what will the graph show?

Answer 10

regions where the temperatures of the ice cubes increases
no temperature change even though the ice cubes continue to be heated
this should occur at 0 degrees where the ice is melting from solid to liquid