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Biology2
Biology - Atoms and Stuff
28
Biology
Undergraduate 1
09/23/2014

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Term
Atomic Theory
Definition
-All living and non-living things in the physical and natural universe are made up of atoms
-Atoms are made up of sub-atomic particles:
protons, neutrons, & electrons
Term
-C,H,O,N,P,S
-Na, Mg, K, Ca, Cl
Definition
Common elements found in organisms
Term
11 , 23
Definition
Sodium has 11 protons, 11 electrons, and 12 neutrons. Its atomic number is ______, while its atomic weight is ______.
Term
neutrons
Definition
Isotopes differ in the number of___________.
Term
Hydroen
Definition
Weak bonds that form between water molecules or between the nucleotide bases of two strands of DNA are called ______ bonds.
Term
-The polarity of water makes it a great solvent!
-Oxygen is among the most electronegative of all elements
-Water is a very polar molecule
Definition
Why is Water So Special?
Term
Hydrogen Bonds
Definition
-Can be intra- or intermolecular
-Weak interaction
-Not as strong as a covalent bond
-Not limited to just water molecules
-Makes it possible for almost any charged or polar molecule to dissolve in water.
Term
Hydrogen bonds
Definition
Form between water molecules
Term
True
Definition
TRUE or FALSE: Electrons are pulled toward oxygen.
Term
Cohesion and Adhesion
Definition
Explain why a meniscus forms where water meets a solid surface
Term
Cohesion
Definition
Binding between like molecules
Term
Adhesion
Definition
Binding between unlike molecules
Term
False
Definition
TRUE or FALSE: The solid form of water is more dense than the liquid form
Term
Ice
Definition
-a crystal lattice
-Molecules are evenly spaced
Term
Water
Definition
-Lacks the order of evenly spaced molecules
-Molecules can be closer together, thus more dense
Term
High specific heat
Definition
Amount of heat required to raise the temperature of 1 gram of substance by 1°C
Term
High heat of vaporization
Definition
Energy required to change 1 gram of a substance from a liquid to a gas
Term
pH
Definition
concentration of hydrogen ions (H+)
Term
Acid
Definition
One gives up a proton is a(n):
Term
Base
Definition
One accepts a protone is a(n):
Term
True
Definition
TRUE or FALSE: Water can act as both an acid and a base
Term
Buffers
Definition
Compounds that minimize fluctuations in pH
Term
pH 7
Definition
What is the pH of pure water?
Term
Alkaline / Basic
Definition
pH > 7
Term
Acidic
Definition
pH < 7
Term
Neutral
Definition
pH = 7
Term
the number of protons in the nucleus
Definition
How do you find the atomic number?
Term
Protons plus neutrons
Definition
How do you find the atomic weight?
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