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21 Cards in this Set

  • Front
  • Back
Mixture
A sample of matter composed of two or more substances, each of which retains its identity and properties.
Element
A pure substance that cannot be decomposed into a simpler substance by chemical means.
Compound
A pure substance made up of two or more different elements in a fixed, characteristic chemical combination.
Atom
The smallest unit of an element that can exist as a stable independent entity
Molecule
The smallest particle of an element or compound capable of a stable, independent existence.
Proton
A subatomic positively charged particle
neutron
a subatomic particle with a neutral charge and about the same mass as a proton
electron
a subatomic particle with a negative charge and a mass of almost 0.
catalyst
chemical substance that accelerates the rate of a reaction without being changed
atomic number
the # of protons in the nucleus of an atom
mass number
the sum of the # of protons and neutrons in the nucleus of an atom
isotopes
two or more forms of the same element whose nuclei differ in number of neutrons (and mass)
covalent
a type of bond where electrons are shared between atoms
photon
A particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass
steady state
a condition in which a dynamic system is in balance so that there is no net change in concentration of the major species involved
nucleus
the center of an atom, made up of protons and neutrons
matter
Matter is anything that has mass and takes up space
allotropes
Each of two or more different physical forms in which an element can exist. Graphite, charcoal, and diamond are all allotropes of carbon
wavelength
the distance between successive peaks in a sinusoidal wave
frequency
the number of waves passing a fixed point in 1 second
free radical
a highly reactive chemical species with one or more unpaired electrons