A student designed an experiment to test the affect of salt on the number of plants that
live in water. What is the dependent variable
in this experiment
A. The water
B. Water temperature
C. The number of plants living in the water
D. The amount of salt in the water

How many grams of mgbr2 are needed to produce 75g or metal?

Mercury turns to a vapor at 629.88 k. how much heat is lost when 75.0 g of mercury vapor at 650 k condenses to a liquid at 297 k?

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.