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Bio quiz 2
Terms in this set (40)
A substance composed of 2 or more different elements, in a fixed ratio (H2O) (more common than pure elements)
smallest unit of matter with the same properties of that element
1. Electron(1/2000 of the mass of a proton)
2. Proton (P and E equal in magnitude)
What holds atoms together?
the number of protons in the nucleus
the number of protons plus the number of neutrons(EX. Helium=4)
What determines an atom's reactivity?
What does the atomic # predict?
the # of electrons
How many electrons does the intermost shell hold?
Why is an atom reactive?
Incomplete outermost shell
What do atoms with incomplete outer shells form?
Kinds of Bonds
1. Ionic- Gives away electrons(EX. Salt)
2. Covalent- sharing of electrons
3. Hydrogen Bonds(Picture in notes)
Atoms or molecules with a electrical charge due to a gain or loss of electrons
H-H or 0=0
Structural Formula, the - is a pair of shared electrons
How many convalent bonds can an atom form?
The number of electrons needed to fill the outermost shell
Lots of H+
Lots of OH-
What is the acidity of water?
pH6-->pH5 is how many more H+ ions?
10x, to pH4 its 100x
Nonpolar Covalent Compound
No charge on molecule( H2, O2)
Polar Covalent Compounds
Why does life require water?
reactions cannot happen without water molecules
1. Physical States
3. Surface Tension
1. Vapor (Gas)
2. Liquid (water)
3. Solid (snow, ice)
When molecules are bounded to other water molecules(only in liquid & solid state)
measure of difficulty to break or distort the surface of a liquid.
Solute is a substance dissolved in a solvent=solution
Water can dissolve...
1. Ionic Compounds
2. Polar Covalent Compounds
3. Gases O2, N2, CO2(dissolve faster in colder water)
Water cannot dissolve...
oils, fats, and non polar covalent compounds
Amount of heat energy required to increase the temperature of 1 gram of a substance in 1 degree C (takes a while to heat up water; water=cal/1)
process of removing heat from an organism through evaporation of water
Heat of Fusion
-Most liquids the density increases as the temp goes down
-The density and temp go down for water until 4 degrees C where the density increases(bonds get longer, less dense)
As water freezes in a confined space it expands and the space will have to yield (EX. Think rock)
the basic unit of life
1. no nucleus
1. Nucelus containing DNA
2. Small -->huge
3. uni or multicellular
4. more complex
Fungi, plants, protista, animalia
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