Acompound is found to consist of 2.89 g of calcium and 5.11 g of chlorine. what is the percent by mass of calcium in the compound

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

If the concentration of phosphate in the cytosol is 2.0 mm and the concentration of phosphate in the surrounding fluid is 0.1 mm, how could the cell increase the concentration of phosphate in the cytosol? a) passive transportb) diffusionc) active transportd) osmosise) facilitated diffusion

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?