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BIOL - 161 Vocab Ch 2
Vocabulary Chapter 2
20
Biology
Undergraduate 2
11/28/2011

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Term
Element
Definition
a fundamental form of matter
Term
Electron
Definition
negatively charged subatomic particle
Term
Isotope
Definition
it differs in its atomic mass from other atoms of the same element
Term
Atomic Number
Definition
this equals the number of protons in the atom of an element
Term
Orbital
Definition
the location of electrons in an atom
Term
Covalent Bond
Definition
formed by equal sharing of electrons
Term
Polar Covalent Bond
Definition
formed by an unequal sharing of electrons
Term
Hydrogen Bond
Definition
a weak attraction between polar molecules
Term
Hydophilic Molecule
Definition
this often contains a polar covalent bond
Term
Solvent
Definition
a substance that dissolves another substance
Term
Solution
Definition
this consists of a solute and a solvent
Term
pH
Definition
a measure of H+ concentration in a solution
Term
Cohesion of Water Molecules
Definition
the property of water molecules responsible for its high surface tensions
Term
Calorie
Definition
a measure of heat energy
Term
Acid
Definition
this has a pH less than 7.0
(on a scale of 14)
Term
Buffer
Definition
a chemical that resists changes in pH by combining with H+ or OH- ions
Term
Acidic Solution
Definition
a substance that readily gives up H+
Term
Free Radical
Definition
this had an unpaired electron
Term
Water
Definition
this compound may act as an acid or a base
Term
Nonpolar compound
Definition
the molecules have an equal distribution of charges with them
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