A 500.-L sample of oxygen gas at 24 °C was
prepared by decomposing a 3.0% aqueous
solution of hydrogen peroxide, H²O² in the
presence of a small amount of manganese
catalyst by the reaction
2H²0²(aq) › 2H²0(g) + 0²(g)

The oxygen thus prepared was collected by
displacement of water. The total pressure
collected was 755 mm Hg. What is the partial
pressure of oxygen in the mixture? How many moles of oxygen are in the mixture? (The vapor pressure of water at 24°C is 23 mm Hg.)

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

what does the table look like

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?