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BIO 110: Chapter 2
Chemical Basis of Life
83
Biology
Undergraduate 1
06/10/2009

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Term
Atom
Definition
Smallest Functional Unit of Matter
Term
Hydrogen
Definition
Smallest atom
Term
Electron
Definition
Subatomic particle with negative charge. Found outside the nucleus.
Term
Proton
Definition
Subatomic particle with positive charge. Found in the nucleus.
Term
Neutron
Definition
Subatomic particle with no charge, found in nucleus.
Term
Lowest Energy Shell
Definition
Energy shell closest to the nucleus
Term
Highest energy shell
Definition
Energy shell farthest from the nucleus.
Term
S Orbitals
Definition
Spherical electron orbitals.
Term
P Orbitals
Definition
Dumbbell or propeller shaped orbitals.
Term
2 electrons
Definition
Maximum number of electrons in first energy shell.
Term
8 electrons
Definition
Maximum number of electrons in second energy shell.
Term
Valence Shell
Definition
Outermost energy shell of an atom.
Term
3 Covalent Bonds
Definition
Number of Covalent Bonds Nitrogen can make.
Term
1 Covalent Bond
Definition
Number of covalent bonds a Hydrogen atom can make.
Term
2 covalent bonds
Definition
Number of covalent bonds Oxygen can make.
Term
4 covalent bonds
Definition
Number of covalent bonds Carbon can make.
Term
Atomic number.
Definition
Number of protons in an atom.
Term
Number of electrons in outer shell.
Definition
Column numbers of periodic table represent what feature of atoms in those columns.
Term
Number of energy shells
Definition
Row numbers of the Periodic Table indicates what feature of atoms in those rows.
Term
Protons and Neutrons
Definition
Subatomic particles that are nearly equal in mass.
Term
1800
Definition
Protons and Neutrons are ________ times the mass of Electrons.
Term
Atomic Mass
Definition
Number of Protons plus neutrons in an atom.
Term
1 Dalton
Definition
1/12 the mass of Carbon.
Term
12 Daltons
Definition
Carbon has an atomic mass of_____.
Term
6.022 X 1023
Definition
Avogadro's Number
Term
1 Mole
Definition
6.022 X 10^23 atoms.
Term
Isotopes
Definition
Multiple forms of an element that differ in the number of neutrons.
Term
RadioIsotopes
Definition
Isotopes that are unstable, last for many years and losse energy by emitting subatomic particles/radiation.
Term
MAIN ELEMENTS
Definition
Hydrogen, Oxygen, Carbon, Nitrogen: Make up 95% of atoms in living organisms.
Term
Hydrogen and Oxygen
Definition
Elements that occur primarily in water.
Term
Nitrogen
Definition
Main element found in proteins.
Term
Carbon
Definition
Main Element that is the building block of all living matter.
Term
Mineral Element
Definition
Calcium: Main, Mineral or Trace?
Term
Mineral Element
Definition
Chlorine: Main, Mineral or Trace?
Term
Mineral Element
Definition
Magnesium: Main, Mineral or Trace?
Term
Mineral Element
Definition
Phosphorous: Main, Mineral or Trace?
Term
Mineral Element
Definition
Potassium: Main, Mineral or Trace?
Term
Mineral
Definition
Sodium: Main, Mineral or Trace?
Term
Mineral
Definition
Sulfur: Main, Mineral or Trace?
Term
Main
Definition
Carbon: Main, Mineral or Trace?
Term
Main
Definition
Hydrogen: Main, Mineral or Trace?
Term
Main
Definition
Oxygen: Main, Mineral or Trace?
Term
Main
Definition
Nitrogen: Main, Mineral or Trace?
Term
Trace
Definition
Iron: Main, Mineral or Trace?
Term
Trace
Definition
Chromium: Main, Mineral or Trace?
Term
Trace
Definition
Copper: Main, Mineral or Trace?
Term
Trace
Definition
Fluorine: Main, Mineral or Trace?
Term
Molecule
Definition
2 or more atoms bonded together.
Term
Compound
Definition
Molecule composed of 2 or more elements.
Term
Covalent Bond
Definition
Bonding where atoms share a pair of electrons.
Term
Covalent Bond
Definition
Strongest of all chemical bonds, where shared electrons behave as if they belong to each atom.
Term
Polar covalent bond.
Definition
Two atoms with different electronegativities that are covalently bonded.
Term
Polar Covalent Bonds
Definition
Bonding that occurs because the distribution of electrons around the atoms creates a polarity, or difference in electric charge across the molecule.
Term
Polar Covalent Bond
Definition
Bond that holds water together. Hydrophillic.
Term
Hydrophillic
Definition
Water loving.
Term
Polar Covalent Bond
Definition
Bonds between O-H and H-O-H and N-H.
Term
Non-Polar Covalent Bonds
Definition
Hydrophobic or water hating/fearing bonds.
Term
Non-Polar Covalent Bonds
Definition
Bonds between C-C and C-H.
Term
Non-Polar Covalent Bonds
Definition
Covalent bonds that are electrically neutral.
Term
Ions
Definition
Molecules that have gained or lost one or more electrons.
Term
Ionic Bonds
Definition
Bond between a cation and an anion: forms salts.
Term
Cation
Definition
Atom or Molecule with a net positive charge.
Term
Anion
Definition
Atom or Molecule with a net negative charge.
Term
Chemical Reactions
Definition
When a reactant is changed into a product.
Term
Water
Definition
Solvent for chemical reactions in living organisms.
Term

Require heat,

often require a catalyst,

occur in a liquid environment,

proceed in a paticular direction,

end in equilibrium.

Definition
Properties of Chemical Reactions.
Term
Brain, Blood and Lungs
Definition
Parts of the body with the most water.
Term
Ampipathic Molecule
Definition
Hydrophillic on outside and hydrophic on inside.
Term
Heat of Vaporization
Definition
Energy used to boil water and turn it from a liquid to a gas.
Term
Heat of Fusion
Definition
Energy released to change from a liquid to a solid.
Term

Incompressible

 Evaporative Cooling

Cohesion and adhesion due to H bonds

Participates in chemical reactions

Removes toxic waste

Definition
Water's 5 functions in living organisms.
Term
Incompressible
Definition
Function of water that provides force or support.
Term
Evaporative cooling.
Definition
Function of water that creates water vapor.
Term
Cohesion and adhesion due to H bonds.
Definition
Function of water that provides surface tension.
Term
Participates in chemical reactions.
Definition
Function of water involved in hydrolysis or dehydration.
Term
Removes toxic waste.
Definition
Function of water involved with the kidneys.
Term
Hydrolysis
Definition
When water breaks apart covalent bonds of other molecules.
Term
Dehydration/Condensation
Definition
When water is removed so that covalent bonds may be formed between other molecules.
Term
Hydrolysis
Definition
(R1-R2 + H-O-H -> R1-OH + H-R2)
Term
Dehydration/Condensation
Definition
(R1-OH + H-R2 -> R1-R2 + H-O-H)
Term
Acids
Definition
Molecules that release H+ ions in solution. Increase [H+].
Term
Bases
Definition
Lower the [H+] by either releasing OH or binding H+.
Term
Buffers
Definition
Release H+ or OH into the body to regulate pH.
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