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Chem Quiz 2 Qtr 2
Question | Answer |
---|---|
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. |