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Chemistry Unit 1 Flashcards

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87368408qualitative measurementmeasurments that have to do with the amount of substance, not numerical value0
87368409quantitative measurmentcharacteristic involves a numerical measurement1
87368410accuracythe extent to which a given measurement agrees with the standard value for that measurement2
87368411precisionthe extent to which a given set of measurements of the same sample agree with their mean3
87368412densitymass per unit volume4
87368413mattersomething that occupies space5
87368414massa body of coherent matter, usually of indefinite shape and often of considerable size6
87368415weighta system of units for expressing heaviness or mass7
87368416volumethe amount of space, measured in cubic units, that an object or substance occupies8
87368417pure substancea kind of matter that cannot be separated into other kinds of matter by any physical or chemical process9
87368418atomare the basis for everything in the Universe10
87368419moleculean electrically neutral group of at least two atoms in a definite arrangement held together by very strong (covalent) chemical bonds11
87368420elementa component or constituent of a whole or one of the parts into which a whole may be resolved by analysis12
87368421compoundcomposed of two or more parts, elements13
87368422solidhaving three dimensions (length, breadth, and thickness14
87368423liquidcomposed of molecules that move freely among themselves but do not tend to separate like those of gases15
87368424gasa substance possessing perfect molecular mobility and the property of indefinite expansion16
87368425physical propertyany property used to characterize matter and energy and their interactions17
87368426chemical propertycharacteristic of a substance that becomes known during a chemical reaction18
87368427physical changewhen objects undergo a change that does not change their chemical nature19
87368428chemical changesubstances are changed into different substances20
87368429mixturean aggregate of two or more substances that are not chemically united and that exist in no fixed proportion to each other21
87368430heterogeneous mixturemade up by two or more different substances which are (mixed) together but are not combined chemically22
87368431homogeneous mixturea mixture made up of two or more elements that are chemically combined.23
87368432mole6.02x10^2324
87717876Exothermic HeatHeat is given off. ex: fireworks25
87717877Endothermic HeatHeat is absorbed. ex: cooking a hamburger26

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