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Chem Quiz 2 Qtr 2

Most Abundant element on Earth Oxygen
21% of Air Oxygen
What percent of water is oxygen 89%
What does "oxygen" mean? acid former
Properties of oxygen tasteless, odorless, colorless gas. Heavier than air. Slightly soluble in water. Can be liquified. Made solid by low temp and heavy pressure
Chemical properties Reacts with many substances, forms oxides, support combustion, acts as oxidizing agents
WHat defines oxidation? + of oxygen - of hydrogen - of electrons + in oxidation #
WHat defines reduction? - oxygen +hydrogen + electrons - oxidation #
WHat is the substance oxidized in a redox reaction reducing agent
WHat is the simplest reducing agent? Hydrogen
Three allotropic forms of oxygen O3, O2, O
What is the most abundant element in the Universe? Hydrogen
T or F There is a lot of free hydrogen False
Physical properties of hydron Colorless, odorless, tasteless gas. Lightest gas, slightly soluble in water
Chemical properties of hydrogen Burns hot with a blue flame forming water. Does not support combustion. Reducing agent
WHat is the most abundant compound? Water
How much of the Earth is covered in water? 75%
WHat cells have water? Animal, plant, bacteria
To what degree is water bent? 105
WHat is the molecular mass of water? 18 amu
Physical properties of water Colorless tasteless liquid.
Freezing point of water 0 degrees C
Boiling point of water 100 degrees C
Heat of fusion of water 80 c/g
Heat of vaporization 540 c/g
WHat is hydrogen bonding? Intermolecular force cause by the attraction of one water molecule's H atom to another water molecule's Oxygen atom
WHat is surface tension? force that cause the surface of a liquid to contract
What are the embalming implications of surface tension? Occurs at the interface of solutions an cell membranes. Can interfere with diffusion of chemicals from capillaries to tissues. This is alleviated by surface agents. `
Chemical properties of water Very stable. Reacts chemically with group I and IIA metals to liberate hydrogen gas
WHat does water form with some metallic oxides? Bases
What does water form with some non metallic oxides? Acids
WHat minerals are in hard water Ca, Mg, Fe (II)
How does is effect soap Stops cleansing action
WHat are two classes of of hard water? Temorary and Permanent
How can you remove temporary hardwater? Boiling and filtration
WHat causes temporary hard water? bicarbonate salts of Ca and Mg
What causes permanent hard water? Chlorite and and sulfate salts of Ca and Mg
Embalming implications of hard water Ionized calcium aids clotting, hard water should be avoided when diluting fluid, water softeners are used in arterial fluids.



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