1. (or, How to melt ice and boil water)
Phase Change Lab
(or, How to melt ice and boil water)

2. Bunsen Burner Safety Safety goggles
Burner air intake collar ½ way open
Burner airflow valve (pin) closed all the way, then open 2 turns
Prepare striker
Gas on (stopcock parallel to hose)
Strike:
Away from your face
Make GOOD sparks
CLOSE to barrel
CAN’T LIGHT? TURN OFF GAS!!!

3. Lab Instructions Set-up your lab according to example:
Ringstand with wire screen
100mL beaker with a few ice cubes
Add water to about the 50mL mark
LabQuest temperature probe in split-cork **probe must not touch beaker**
Record temperature of ice water in your DATA TABLE: Time(min) vs. Temp (⁰C)
Light Bunsen burner
2 blue cones
“roaring” sound
Flame should barely touch wire screen
Start timer
Heat beaker and record temperature EVERY ½ MINUTE (0, 0.5, 1.0, 1.5, etc…)
Let water boil for about 5 minutes
Done? Clean-up and graph your data (IV, DV) or (x,y) or (cause,effect)
Leave-out the ringstand and wire screen (HOT!)
Stools UNDER lab benches, safety goggles in cabinet, all other supplies returned