Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions book for this question. A solution is made of 300 grams of ethanol
(C2H5OH)
and 500 grams of water.
What is the mole fraction of ethanol in this solution?
O 0.19 M
O 0.81
O 0.81 M
O 0.19

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.

Which of the following is not an assumption that scientists must make about the natural world? a. regularity b. causality c. predictability d. plausibility

Which statement best describes the liquid state of matter? a. it has definite shape but indefinite volume. b. it has definite shape and definite volume. c. it has indefinite shape and indefinite volume. d. it has indefinite shape but definite volume.