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25 Cards in this Set
- Front
- Back
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Polypeptide
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A polymer of amino acids that has a molecular weight of less than 10,000
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Polyprotic acid
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A substance capable of dissociating more than one proton in water; H2SO4 is an example
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Polysaccharide
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A substance made up of several monosaccharide units joined together
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Porphyrin
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A complex derived from the porphine molecule
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Positron
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A particle with the same mass as an electron but with a positive charge
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Potential energy
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The energy that an object possesses as a result of its composition or its position with respect to another object
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Precipitate
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An insoluble substance that forms in, and separates from a solution
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Precipitation reaction
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A reaction that occurs between substances in solution in which one of the products is insoluble
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Precision
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The closeness of agreement among several measurements of the same quantity; the reproducibility of a measurement
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Pressure
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A measure of the force exerted on a unit area. In chemistry it is expressed in atmospheres or torrs
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Pressure-volume work
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Work performed by expansion of a gas against a resisting pressure
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Primary structure
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The sequence of amino acids along a protein chain
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Primitive cubic cell
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a cubic unit cell in which the lattice points are at the corners only
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probability density
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A value that represents the probability that an electron will be found at a given point in space
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Product
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A substance produced in a chemical reaction; it appears to the right of the arrow in a chemical equation
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Property
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A characteristic that gives a sample of matter its unique identity
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Protein
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A biopolymer formed from amino acids
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Protium
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The most common isotope of hydrogen
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Proton
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A positively charged subatomic particle found in the nucleus of an atom
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Pure substance
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Matter that has a fixed composition and distinct properties
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Pyrometallurgy
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A process in which heat converts a mineral in an ore from one chemical form to another and eventually to the free metal
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qualitative analysis
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The determination of the presence or absence of a particular substance in a mixture
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Quantitative analysis
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The determination of the amount a given substance that is present in a sample
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quantum
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The smallest increment of radiant energy that may be absorbed or emitted; the magnitude of radiant energy
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Racemic mixture
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A mixture of equal amounts of the dextrorotatory and levorotatory forms of a chiral molecule
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