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40 Cards in this Set
- Front
- Back
Pure Substance
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matter that always has exactly the same composition; an element or compound
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Element
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a substance that can not be broken down into simpler substances
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Atom
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the smallest particle of an element
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Compound
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a substance that is made from two or more simpler substances and can be broken down into those simpler substances
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Heterogeneous mixture
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a type of mixtrue in which the parts of the mixture are noticeably different from one another
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Suspension
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a heterogeneous mixtrue that seperates into layers over time
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Colloid
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a mixture that contains some particls that are intermediate in size between the small particles in a solution and the larger particels in a suspension
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Physical property
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any characteristic of a material that can be observed or measured without changin the composition of the substances in the material
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Viscosity
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the tendency of a liquid to keep from flowing; restistance to flowing
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Conductivity
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a material's ability to allow heat or electric charge to flow
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Malleability
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the ability of a solid to be hammered without shattering
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Melting Point
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the temperature at which a substance changes froms solid to liquid
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Boiling Point
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the temperature at which a substance boils; the temperature at which vapor pressure is equal to atmospheric pressure
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Filtration
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a process that seperates materials based on the size of their particles
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Distillation
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a process taht seperates the substances in a solution based on their boiling points
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Physical change
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a change that occurs when some properties of a material change, but the substances in the material stay the same
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Chemical Property
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any property that produces a change in the composition of matter
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Flammability
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a material's ability to burn in the presence of oxygen
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Reactivity
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a property that describes how readily a substance combines chemically with other substances
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Chemical Change
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change that occures when a substance reacts and forms one or more new substances
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Precipitate
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a solid that forms and seperates from a liquid mixture
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Solid
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the state of matter in which materials have a definite shape and a definite volume
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Liquid
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the state of matter in which material has definite volume but takes the shape of its container
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Gas
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the state of matter in which material has neither a definite shaper nor a definite volume
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Kinetic Energy
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the energy an object has due to its motion
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Pressure
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The result of a force distribued over an area
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Absolute Zero
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a temperture of 0 Kelvins
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Charles's Law
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the direct proportion if the volume of a gas to its temperte (in kelvins) if the pressure and the nubmer of particles of the gas are constant
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Boyle's Law
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the inverse variation of the volume of a gas w/ its pressure if the temperature and the number of particles are constant
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Phase Change
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a reversible physical change that occurs when a substance changes from one state of matter to another
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Endothermic
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a description of a change in which a system absorbs energy from its surroundings
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Heat of Fusion
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the energy of a substance must absorb in order to change from a solid to a liquid
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Exothermic
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a description of a change in which a system releases energy to its surroundings
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Vaporization
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the phase change in which a substace change from a liquid into a gas
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Heat of Vaporization
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the enrgy of a substance must absorb in order to change from a liquid to a gas
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Evaporation
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the process that changes a substance from a liquid to a gas at temperatures below the substance's boiling point
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Vapor Pressure
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the pressure caused by the collisions of particles in a vapor w/ the walls of a container
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Condensation
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the phase change in which a substance changes from a gas or vapor to a liquid
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Sublimation
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the phase change in which a substance changes from a solid to a gas or vapor w/o changing to a liquid first
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Deposition
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the phase change in which a gas or vapor changes directly into a solid w/o first change into a liquid
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