Hydrogen peroxide is used as a cleaning agent in the treatment of cuts and abrasions for several reasons. It is an oxidizing agent that can directly kill many microorganisms; it decomposes upon contact with blood, releasing elemental oxygen gas (which inhibits the growth of anaerobic microorganisms); and it foams upon contact with blood, which provides a cleansing action. In the laboratory, small quantities of hydrogen peroxide can be prepared by the action of an acid on an alkaline earth metal peroxide, such as barium peroxide. BaO2(s) _ 2HCl(aq) S H2O2(aq) _ BaCl2(aq) What amount of hydrogen peroxide should result when 1.50 g of barium peroxide is treated with 25.0 mL of hydrochloric acid solution containing 0.0272 g of HCl per mL?
Chapter 11 Notes ❖ When a molecule is charged, it is very polar ➢ Charged = extremely polar ❖ The larger the molecule, the stronger the london forces Entropy (S): The amount of randomness in a system ❖ Spontaneous processes ➢ Are favored by a decrease in H, or enthalpy (negative ΔH) ➢ Are favored by an increase in S, e ntropy (positive ΔS) ➢ Between solids, l iquids, and gas olids have the least entropy (molecules are more tightly packed together) → liquids have more entropy than solids (molecules are more spread out and move random) → gases have the most entropy (molecules move more randomly than liquids) ❖ Non-spontaneous processes are the opposite of spo