Chemistry questions


Using 3 – 4 sentences explain (in your own words) why water expands when it freezes?


1.     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.?


The density of liquid water is 1.00 g/cm3.  The density of ice is 0.92 g/cm3.  In 3 – 4 sentences explain why applying pressure causes ice to melt?


1.     Why must the number of electrons lost equal the number of electrons gained in every redox reaction?  Use 3 – 4 sentences in your own words to address this question?


20.  Iron-59 has a half-life of 45.1 days.  How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron?   Show all calculations leading to a solution.

Answer all question in complete sentences, all work shown 

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