Chemistry Unit 1 Flashcards

87368408	qualitative measurement	measurments that have to do with the amount of substance, not numerical value	0
87368409	quantitative measurment	characteristic involves a numerical measurement	1
87368410	accuracy	the extent to which a given measurement agrees with the standard value for that measurement	2
87368411	precision	the extent to which a given set of measurements of the same sample agree with their mean	3
87368412	density	mass per unit volume	4
87368413	matter	something that occupies space	5
87368414	mass	a body of coherent matter, usually of indefinite shape and often of considerable size	6
87368415	weight	a system of units for expressing heaviness or mass	7
87368416	volume	the amount of space, measured in cubic units, that an object or substance occupies	8
87368417	pure substance	a kind of matter that cannot be separated into other kinds of matter by any physical or chemical process	9
87368418	atom	are the basis for everything in the Universe	10
87368419	molecule	an electrically neutral group of at least two atoms in a definite arrangement held together by very strong (covalent) chemical bonds	11
87368420	element	a component or constituent of a whole or one of the parts into which a whole may be resolved by analysis	12
87368421	compound	composed of two or more parts, elements	13
87368422	solid	having three dimensions (length, breadth, and thickness	14
87368423	liquid	composed of molecules that move freely among themselves but do not tend to separate like those of gases	15
87368424	gas	a substance possessing perfect molecular mobility and the property of indefinite expansion	16
87368425	physical property	any property used to characterize matter and energy and their interactions	17
87368426	chemical property	characteristic of a substance that becomes known during a chemical reaction	18
87368427	physical change	when objects undergo a change that does not change their chemical nature	19
87368428	chemical change	substances are changed into different substances	20
87368429	mixture	an aggregate of two or more substances that are not chemically united and that exist in no fixed proportion to each other	21
87368430	heterogeneous mixture	made up by two or more different substances which are (mixed) together but are not combined chemically	22
87368431	homogeneous mixture	a mixture made up of two or more elements that are chemically combined.	23
87368432	mole	6.02x10^23	24
87717876	Exothermic Heat	Heat is given off. ex: fireworks	25
87717877	Endothermic Heat	Heat is absorbed. ex: cooking a hamburger	26