Classify the following compounds as ionic or covalent: a. MgCl2 b. Na2S c. H2O d. H2S

What is the pH of a solution with a concentration of 7.6 * 10-7 M H3O+? 0.993 6.12 7.88 8.34

In a chemical reaction, which symbol should be used to indicate a substance is in solution

Mass = 108 g volume 12 cm3

Determine the molality of an aqueous solution that is 15.5 percent urea by mass.

What is the Balenced chemical equation for the creation of water? hydrogen + oxgen - - - > water

What is the empirical formula of Fe?

Small beads of iridium-192 are sealed in a plastic tube and inserted through a needle into breast tumors. If an Ir-192 sample has an initial activity of 560 dpm, how much time is required for the activity to drop to 35 dpm (t1/2 = 74 days) ?

Consider the following equation. 2H2 (g) + O2 (g) 2H2O (g); ΔH is negative. Which statement is true? The reaction is endothermic from left to right. Increased pressure would increase the rate of forming water vapor.

Ions form when atoms gain or lose protons. True or False.

In which of the following aqueous solutions would you expect AgI to have the highest solubility? In which of the following aqueous solutions would you expect AgI to have the highest solubility? 0.038 M NaI 0.050 M AgNO3 0.025 M KI 0.