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18 Cards in this Set
- Front
- Back
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Accuracy
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How close a measurement is to the actual value
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Atom
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The smallest part of an element that retains the characteristics of an element
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Boiling point
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The temp at which a liquid is changed into a gas; the vapor pressure of liquid and gas are equal at this temp
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Chemistry
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The branch of science that deals with the study of composition, structure, and properties of matter and the changes matter undergoes
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Compound
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A substance which can be broken down by chemical means into simpler substances
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Density
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The mass per unit volume of a substance
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Element
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A substance which cannot be broken down into simpler substances by ordinary chemical means
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Endothermic reaction
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A reaction in which the products have a higher heat energy content than the reactants
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Entropy
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A quantity described as the randomness of a substance or system
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Exact numbers
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Numbers that result from counting or definitions and do not limit the number of significant figures in the answer
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Exothermic reaction
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A reaction in which the products have a lower heat energy content than the reactants
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Formula
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A grouping of elemental symbols which tells us not only what types of atoms compose tote compound but also the number of each type of atom in one molecule of the compound
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Gas
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A state of matter characterized by particles that are at apart compared to their sizes and which are able to to move about quite freely; a gas is compressible and has no definite volume or shape
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Kinetic energy
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The energy possessed by matter due to its motion
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Law of conservation of energy
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Energy is neither created nor destroyed in chemical and physical processes
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Law of conservation of mass-energy
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Matter and energy can neither be created nor destroyed, only changed from one form to another; the first law of thermodynamics
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Law of definite composition
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The ratios of the masses of each element Ina given compound are always the same
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Law of multiple proportions
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When two elements can combine to form more than one compound, the masses of one element that combine with a fixed amount of the other element are in a ratio of small whole numbers
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