Lab+22+Pre-lab+Paragraph+Links

STOP ERASING OTHER PEOPLES WORK. I WILL FIND YOU. YOU KNOW WHO YOU ARE.

Tenzin, Sixto, Eric,Jonathan

Salt is added to the ice surrounding the ice cream ingredients in order to cause the freezing point depression of the water. this changing the colligative properties of the ice water surrounding the ice cream. this will allow the ice cream ingredients, surrounded by the ice cold salt water, to remain cool and hot melt. Heat for phase change comes from the ingredients and they freeze to make ice cream. this is a good example of an endothermic phase change. Also when salt is added into the ice water the ionic compounds split into smaller ions. this process is called dissociation

When any salt is added to water,the freezing point of the water decreases. The added salt lowers the freezing point and helps to melt the snow or ice. The amount of of the lowering of the freezing point is not dependent on the nature of the added particle. One mole of any particles will have the same effect on the freezing point.

Dana, Kadin, Keith When salt dissolves, it causes the colligative property of freezing point depression. This is the ability of a solid to lower the temperature at which its solution freezes. When salt is added to ice in the bag where ice cream is being made, the ions in NaCl disassociate from each other and bond with H2O molecules. This process leads to the freezing point being lowered. The ice also melts, which is an endothermic phase change - so it removes heat from the ice cream solution, making it colder and freeze faster.

__**Chris, Dominique, Mitchell, Jasmin**__ Adding salt to water would lower the waters freezing point, also known as Freezing point depression. This process is endothermic because when solute and solvent particles separate, energy is needed. Energy is also needed to melt the ice.

Abraham,Alina,Kevin,Tenai


 * Sixto :** I think salt is used because salt in water has a lower freezing than water without the salt. The water has to reach a temperature of -10 degrees Celsius in order for it to freeze. Salt has the colligative property to lower the freezing point of the solution. It was once believed that a mixture of of salt and ice created the lowest temperature that could be reached by humans so that's probably why were gonna use salt tomorrow.

__**Tazkia, Sylvia,** **Bryant,** **Dylan (edited)**__ Adding salt to the water causes ions of the compound salt to dissociate. When salt dissolves, it causes a freezing point depression, which is a colligative property. The ice melts. The melting of the ice is an endothermic phase change. Heat is "taken" or removed from the ingredients. The ice cream freezes-yummy!

__**Ana, Deisy, Alejandro, Andy-**__


 * __Malasia, Max, Stephanie, Elishia, and Kevin A.:__ The salt is added to the ice surrounding it because it keeps the water, with a large surface area, as cold as the ice was before it. Adding salt to ice would lower the freezing point of the water, also known as a Freezing Point Depression. When the salt is dissolved into water, the salt ions separate from each other in aprocess called dissociation. Dissolution is endothermic because it requires energy to dissolve salt in water. An ion is an electrically charged atom or group of atoms from by the losss or gain of electron(s). When the ice melts, the resulting phase change is endothermic. The colligative properties of water show that when a solute is added, especially NaCl, there is a freezing point depression. The energy is absorbed away from the ice cream, causing it to lower in temperature (energy) and freeze. **