1. How much does water expand when frozen?
2. When is water the smallest liquid, at what temperature?
3. What happens when Salt is added to water?
4. Does the amount of salt added effect the freezing time?
A) A little about of salt in water?
B) A lot of salt in the water?
5. How does freezing ice relate to molecules?
1. Water does expand when it is frozen. Although, I did not see the water expand,with my eyes, I hypothesized before the experiment that the water molecules were compacted very tightly together, creating ice. However,according to my research water expands about 9% and looking at the molecular model I noticed that there is open space between the water bonds.
ReplyDeletehttp://www.iapws.org/faq1/freeze.htm
2. When I did this experiment I put an inch of water into a clear, plastic cup. Then, I put the cup of water in the back part of my freezer for about 45 minutes. I took the temperature of my freezer which was 26 degrees Fahrenheit. Next I waited for the water to freeze. I noticed after 45 minutes that there was a thin layer of ice in the cup. I punched a small hole using a screwdriver to measure the temperature of the ice/water. It was 35 degrees. With previous knowledge I did know that water freezes at 32 degrees Fahrenheit and I was around the right temperature. I was probably a little higher because I took the cup out of the freezer to take the temperature.
3.When salt is added to the water the salt crystals immediately drop to the bottom of the cup. Meaning that salt is more dense than water. Also, after doing the next experiment of putting two different measurements of salt into two cup I noticed that salt makes the water freeze faster.
4. Yes, the amount of salt does effect how fast the cups of water freeze. For example I put about one teaspoon of salt into a blue plastic cup and it took 65 minutes for a thin layer of ice to freeze over. On the other hand, the cup that had around a tablespoon of ice in the cup froze within 48 minutes.
5. Freezing ice relates to the spread of molecules because, when water is in a liquid form the molecules are very tightly packed together. However, when water is placed, for instance in a freezer of 26 degrees Fahrenheit, when water's freezing temp is 32 degrees Fahrenheit the molecules spread out based on the idea that water spreads out 9%.