When 0.500 g of vitamin k is dissolved in 10.0 g of camphor (kf = 40.0°c/m), the freezing point of the solution is 4.43°c lower than that of pure camphor. assuming vitamin k is a nonelectrolyte in camphor, calculate its molar mass. 55.4 g/mol 451 g/mol 0.451 g/mol 3.54 × 104 g/mol?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Explain what happens at the saturation point when adding salt to water at room temperature.

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?