Ascientist who wants to study the effects of fertilizer on plant growth sets up an experiment. plant a gets no fertilizer, plant b gets 5mg of fertilizer each day, and plant c gets 10mg of fertilizer each day. what is the independent variable?

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

Ablock of aluminum is dropped into a graduated cylinder with an initial volume of water at 75ml and the volumes rises to 90ml. if the block has a mass of 40.5 g what is its density ?

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o