Astudent wishes to study the effect of proper hydration on the performance of her school's track team. the dependent variable will probably be a. the amount of water consumed by each runner. b. the amount of time it takes each runner to complete a certain event. c. the number of medals awarded to the track team during the season. d. the number of hours that each runner trained before the competition.

Water (2510 g ) is heated until it just begins to boil. if the water absorbs 5.09×105 j of heat in the process, what was the initial temperature of the water?

What is the subscript for oxygen in its molecular formula

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.