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