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AP Bio Chapter 2

Chemical Context of Life

TermDefinition
Matter Anything that takes up space and has mass
Element Substance that can't be broken down to other substances by chem reactions (92)
Compound consists of 2+ diff ele combined in fixed ratio
Essential ele Necessary for orgs to live (96% is C, H, O, N) (Ca, P, K, S, Na, Cl)
Trace ele required by org in only minute quantities
Atom smallest unit of matter that still retains the properties of an ele
Dalton One atomic mass unit (amu); neutrons/protons ~1 dalton
Atomic # # of protons (subscript to left), equal to # of electrons unless indicated
Mass number sum of protons plus neutrons (above atomic #)
Atomic Mass Total mass of an atom
Isotopes Diff atomic forms of same ele (neutrons diff)
Radioactive isotope nucleus decays spontaneously, giving off particles and E; changes to diff ele; used to date relics
Energy Capacity to cause change
Created by: 100001673464441
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