What does an atom contain?

What do you call anything that has mass and volume? A. matter B. an element C. a compound D. a mixture

Calculate the hydrogen-ion concentration (H+] for the aqueous solution in which [OH-1 is 1 x 10-12 mol/L.

Calculate the pH of a solution that has a [OH-] of 2.6 * 10^-6 M. A. 8.4 B. 6.5 C. 7.7 D. 6.29

Which of the following are produced by the process of respiration A. Sugar and carbon dioxide B. Light energy with water C. Carbon dioxide and water

Which of the following is the correctly balanced chemical equation for the reaction of Ca (OH) 2 and HNO3?

What are the phase transitions in which heat energy is gained?

A cylinder contains 4.0 g of nitrogen gas. A piston compresses the gas to half its initial volume. Afterward, by what factor has the mass density of the gas increased?

The balanced equation below represents the reaction between magnesium metal and hydrochloric acid to produce aqueous magnesium chloride and hydrogen gas. Mg (s) + 2HCl (aq) = = > MgCl2 (aq) + H2 (g) A piece of Mg (s) has a volume of 0.

What is the molarity of a solution prepared by dissolving 33.4 g of sodium chloride in some water and then diluting the solution to a volume of 300.00 mL?

Think about how pressure relates to volume and how gas behavior would change in different volumes. Which of the following will have the largest positive value for Sº? A) 1 mole of helium gas at 1 atm pressure.