The reagent pcc in dry methylene chloride is successful in the selective oxidation of primary alcohols to aldehydes because

a. pcc is a relatively weak oxidizing agent
b. primary alcohols cannot oxidize any further
c. hydration of the intermediate aldehyde is unable to take place in dry methylene chloride
d. methylene chloride is a reducing agent
e. none of these choices

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Once similarity and one difference between a mixture of elements and a mixture of compounds

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt