Homework 1/18/2011 Freezing Water

	Cup 1	Cup 2	Cup 3
Temperature At room temp.	19 °C	19 °C	19 °C
Temperature at freezing point	-3°C	-5°C	0°C
Height before	1.3 in	1.3in	1.3in
Height after	1.65in	1.5in	1.5in
Amount of salt	1tsp	3tsp	none

1. How much does water expand when frozen?
From my observations the water in my experiment expanded .2 -.35 inches.

2. When is water the smallest?
Water is the smallest at 99.9 degrees celcius. It is the most dense at 4 degrees celcius.

3. What happens when salt is added to the water?
When salt is added to the water it takes the water longer to freeze.

4. Does the amount of salt added effect the freezing point and when does it freeze?
Yes, from my experiment cup 2 took the longer to freeze because it had more salt in it. Salt water freezes at -3 degrees celcius or at colder temperatures, it varys based on how much salt is in the water.