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37 Cards in this Set

  • Front
  • Back
exothermic
Releasing heat: an exothermic reaction
family
a vertical column of the periodic table
proton
A stable, positively charged subatomic particle in the baryon family having a mass 1,836 times that of the electron.
noble gases
a Group 18 element (helium, neon, argon, krypton, xenon, and radon)
series
..
colloid
a mixture consisting of particles that are intermediate in size between those in solutions and suspensions forming mixtures known as colloid dispersions
electron
A stable subatomic particle in the lepton family having a rest mass of 9.1066 × 10-28 grams and a unit negative electric charge of approximately 1.602 × 10-19 coulombs.
mass number
the total number of protons and neutrons in the nucleus of an isotope
nucleus
The positively charged central region of an atom, composed of protons and neutrons and containing almost all of the mass of the atom
reactant
a substance that reacts in a chemical change
equation
A representation of a chemical reaction, usually written as a linear array in which the symbols and quantities of the reactants are separated from those of the products by an equal sign, an arrow, or a set of opposing arrows
element
a pure substance made of only one kind of atom
nuclear change
..
solvent
the dissolving medium in a solution
equation
..
chemical property
the ablility of a substance to undergo a change that transforms it into a different substance
neutron
An electrically neutral subatomic particle in the baryon family, having a mass 1,839 times that of the electron, stable when bound in an atomic nucleus, and having a mean lifetime of approximately 1.0 × 103 seconds as a free particle. It and the proton form nearly the entire mass of atomic nuclei.
product
a substance that is fomred by a chemical change
endothermic
Characterized by or causing the absorption of heat; endoergic
metal
an element that is a good conductor of heat and electricity
subscript
A distinguishing character or symbol written directly beneath or next to and slightly below a letter or number
compound
a substance that is made from the atoms of two or more elements that are chemically bonded
homogeneous
having a uniform composisiton throughout
atom
the smallest unit of an element that maintains the properties of that element
ion
an atom or group of bonded atoms that has a positive or negative charge
solution
a homogeneous mixture of two or more substances in a single phase
metalloid
an element that has some characteristics of metals and some characteristics of nonmetals
atomic number
the number of protons in the nucleus of each atom of an element
suspension
a mixture in which the particiles in the solvent are so large that they settle out unless the mixture is constantly stirred or agitated
chemical change
a change in which one or more substances are converted into different substnaces
nonmetal
an element thta is a poor conductor of heat and electricity
physical change
a change in a substance that does not invilve a change in the identity of the substance
coefficient
a small whole number that appears in front of a formula in a chemical equation
matter
anything that has mass and takes up space
heterogeneous
not having a uniform composition throughout
physical property
a characteristic thta can bge observed or measured without changing the identity of the substance
solute
the substance dissolved in a solution