24 terms

Basic Chemistry

All Vocab for chapter 2.1 and 2.2 of Prentice Hall - Biology
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atom
basic unit of matter
nucleus
center of the atom containing protons and neutrons
electron
negatively charged particle circulating around the nucleus
proton
positively charged particle of an atom
neutron
neutral particle of an atom
element
pure substance consisting entirely of one type of atom
isotope
atoms of the same element but with a different number of neutron
compound
substance formed by the chemical comination of two or more compounds in definite proportion
ionic bond
Formed when one or more electrons are transferred from one atom to another
ion
positively or negatively charged atom
covalent bond
forms when electrons are shared between atoms
molecule
smallest unit of a compound
van der waals force
force of attraction between large molecules
cohesion
an attraction between molecules of the same substance
adhesion
an attraction between molecules of different substances
mixture
two or more elements or compounds that are physically mixed but not chemically combined
solution
mixture where all components are even distributed
solute
the substance that is dissolved
solvent
the substance in which the solute is dissolved
suspension
mixtures of water and nondissolved materials
pH scale
measures the concentration of hydrogen ions in a solution
acid
solution with a higher concentration of hydrogen ions than water
base
solution witha lower concentration of hydrogen ions than water
buffer
a weak acid or weak base that prevents sudden changes in pH