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Biology 105 - Environmental Science: A Global Concern
Chapter 3 - Matter, Energy, and Life
12
Biology
Undergraduate 1
01/26/2010

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Term
Ecology
Definition
The scientific study of relationships between organisms and their environment.
Term
Matter
Definition
Exists in three distinct states - solid, liquid, and gas, due to differences in the arrangement of its constitutive particles. Composed of elements.
Term
Conservation of Matter
Definition
Neither created nor destroyed, but recycled. Is transformed and combined in different ways, but doesn't disappear.
Term
Elements
Definition
Substances that cannot be broken down into simpler forms by ordinary chemical reactions. Composed of atoms.
Term
Atoms
Definition
The smallest particles that exhibit the characteristics of the element. Composed of positively charged protons, negatively charged electrons, and electrically neutral neutrons.
Term
Atomic Number
Definition
Characteristic number of protons per atom for each element.
Term
Isotopes
Definition
Forms of a single element that differ in atomic mass.
Term
Compounds
Definition
Substances composed of different kinds of atoms.
Term
Molecule
Definition
A pair or group of atoms that can exist as a single unit.
Term
Ions
Definition
Charged atoms (or combinations of atoms).
Term
Acids
Definition
Substances that readily give up hydrogen ions in water.
Term
Bases
Definition
Substances that readily bond with H+ ions (or Alkaline Substances).
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