Topic+1

Topic 1 Rya S.
 * __Colligative properties-__** are properties of solutions that depend on the number of molecules in any given volume of a solvent. These properties include: lowering of vapor pressure, elevation of boiling point, and osmotic pressure.

Colligative properties will only work with solutions. Colligative properties depend on the ratio of particles of a solute in a solvent. Lowering of vapor pressure follows the rules of Raoults law. Boiling point shows that the number of gas molecules and solid molecules leaving and entering are equal, and is achieved at higher temperatures. Freezing would be the same just in colder temperatures. Osmotic pressure is  a dilute solution that at constant temperature proportional to its concentration. And is a solution that is directly proportional to its absolute temperature. That is the colligative properties.  []

Dana m  salt on sidewalks and roads, used to melt the ice and snow and keep it from refreezing. Salt is also used to make homemade ice cream. In both cases, the salt works by lowering the melting or freezing point of water. http://chemistry.about.com/cs/howthingswork/a/aa120703a.htm Samantha l..

1. According to the graph, what is the normal freezing point of water? 2. What is the freezing point depression for sodium chloride? 3. Why is the freezing point of the magnesium chloride solution lower than the freezing point of the sodium chloride solution (assume equal concentrations)? 4. Assuming equal concentrations for all solutes, where would the freezing point of a sugar solution fall on the graph above?

Eric Staul- 1) 0 degrees celcius 2) -2.5 degrees celcius 3) mgcl has a larger amount of particles in it then nacl. thats why mgcl has a lower freezing point 4) above the sodium solution