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45 Cards in this Set

  • Front
  • Back
chemistry
the study of matter and how it changes
matter
anything that has mass and occupies space
element
a substance that cant be broken down into simpler substances
atom
the smallest particle that has the properties of that element.
compound
a substance made of atoms or more than one element bound together
molecule
the smallest unit of a substance that exhibits all of the prperties characteristic of that substance
chemical formula
the chemical symbols and numbers indicating the atoms contained in the basic unit of the substance
pure substance
any matter that has a fixed composition and definite properties
mixture
a combination of more than one pure substance
miscible
describes two or more liquids that are able to dissolve into each other in various proportions
immiscible
describes two or more liquids that do not mix into each other
viscosity
the resistance of a fluid to flow
energy
the ability to change or move matter
evaporation
the change of a substance from a liquid to a gas
condensation
the change of a substance from a gas to a liquid
sublimation
the change of a substance from a solid to a gas
reactivity
the ability of a substance to combine chemically e/ another substance
physical property
a characteristic of a substance that can be observed or measured without changing the composition of the substance
melting point
the temperature at which a solid becomes a liquid
boiling point
the temperature at which a liquid becomes a gas below the surface
density
the mass per unit volume of a substance
buoyancy
force with which a more dense fluid pushes a less dense substance upward
chemical change
a change that occurs when a substance changes compostion by forming one or more new substances
physical change
a change in the physical form or properties of a substance that occurs without a change in composition
nucleus
the center of an atom; made up of protons and neutrons
proton
a postively charged subatomic particle in the nucleus of an atom
neutron
a neutral subatomic particle in the nucleus of an atom
electron
a tiny negatively charged subatomic particle moving around outside the nucleus of an atom
energy level
any of the possible energies an electron may have in an atom
orbital
a region in an atom where there is a high probability of finding electron
valance electrons
an electron in the outermost energy level of an atom
period
a horizantal row of elements in the periodic table
group (family)
a vertical column of elements in the periodic table
ionization
the process of adding electrons or removing electrons from an atom or a group of atoms
ion
an atom that has gained or lost an electron(s)
cation
an ion w. a postive charge
anion
an ion w. a negative charge
atomic #
the number of protons in an atom
mass number
the total number of protons and neutrons in an atom
isotopes
any atoms having the same number of protons but different numbers of neutrons
atomic mass unit (amu)
a quantity equal to 1/12 of the mass of a carbon-12 atom
average atomic mass
the weighted average of the masses of all naturally occuring isotopes of elements.
metals
the elements that are good electricity and heat conductors
nonmentals
elements that are poor conductors of heat and electricyt
semiconductors
inbetween the two elements