Which of the following surrounds a cell, keeping the organelles inside and allowing some things to move into and out of the cell? * a. cell membrane b. cytoplasm c. nucleus

If 200.0g of copper(ll) sulfate react with an excess of zinc metal, what is the theoretical yield of copper

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

Awoman's basketball has a circumference between 28.5 and 29.0 inches and a maximum weight of 20 ounces (two significant figures). what are these specifications in units of centimeters and grams?