Why are hydrogen molecules called elements but water molecules are called compounds?

Which are the four most abundant components of the atmosphere? taken together about what percent of the atmosphere do those four components make up? (abundant non metals in the atmosphere is the title)

A) Cuantas fases tiene una ensalada de tomate y lechuga, un cafe con leche y un vaso de agua y aceite B) Que tipo de sustancias son (Simple o compuesta).

Suppose the liquid water and ice cream did not have solutes dissolved in it. What effect do you think this would have on ice cream?

Homogeneous substances that are evenly mixed

Calculate the volume of acetone with the same mass as 15.0 mL of mercury. The density of mercury is 13.59 g/mL. The density of acetone is 0.792 g/mL.

What is the percent by mass of solute if 14.60g 74.95g of water?

7 An atom that has 13 protons and 15 neutrons is an isotope of the element (1) nickel (3) aluminum (2) silicon (4) phosphorus

The graph below shows how solubility changes with temperature. What is the solubility of Na2HAsO4 at 60°C? 20 g/100 mL of water 46 g/100 mL of water 65 g/100 mL of water 70 g/100 mL of water

Which statement regarding water is true? Energy must be given off in order to break down the crystal lattice of ice to a liquid. Hydrogen bonds are stronger than covalent bonds. Liquid water is less dense than solid water.

Which of the following elements has the fewest valence electrons?. a. beryllium. b. boron. c. carbon. d. lithium