Psych Lecture 9-17-14
Psych Lecture 9-17-14 PSY:1001
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This 3 page One Day of Notes was uploaded by Courtney Collins on Thursday January 22, 2015. The One Day of Notes belongs to PSY:1001 at University of Iowa taught by Shaun Vecera in Fall. Since its upload, it has received 53 views. For similar materials see Elementary Psychology in Psychlogy at University of Iowa.
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Date Created: 01/22/15
What determines the properties of matter composition 0 structures Two categories of pronerties of matter macroscopic submicroscopic ll Classi cation of matter statesl gas no xed volume or shape conforms to volume and shape of container particples far apart moving rapidly liquid distinct volume but no shape assumes shape of portion or container it occupies particples packed close together and moving rapidly can be poured solid distinct shape and volume particples held tightly together with little movement Pure substances and mixtures pure substance a matter with distinct properties and constant composition can be either elements compouns substnace formed from two or more elements Mixtures combination of two or more pure substances relative amounts of components can vary each component retains its own properties Tvnes of mixtures Homooeneous solution dissolves together Heterooeneous not every piece in the mixture is the same Components arent exactly in proportion to each other throughout Ill properties of matter thsical proberties observe without changing the identity or composition of a substnace EX color density melting point boiling point Chemical proberties describe the way a substance may change or react to form other substances EX ammability Intensive property 1 Does not depend on amount of sample 2 Some can be used to identify substance 3 EX melting point density temperature Often used to identify elements Extensive Depends on amount of sample EX mass volume th calChande Substance changes physical appearance but not composition 0 Changes of state are physical changes EX melting ice Chemical change 0 Substance is transformed into a different substance Called a chemical reaction 0 Hydrogen turned into water is an example IV measurement units SI BAsed units 7 length meter m mass kilogram kg time seconds 5 temperature kelvin K amount of a substnace mole mol electical current ampere A luminous intensity candela cd Notes Most unit names use lower case letters use based units to de ne derived units EX speed ms Know these Giga G 10quot9 Mega M 10quot6 Kilo Centi c Milli m Micro Nano Temperature Conversions 373K100C212Fwater boils 273K0C32Fwater freezes F 18C32 V Measurement Uncertainty the number of signi cant gures in a measurements depends upon the measuring device most measurements include some uncertainty numbers convey both value and uncertainty more sig gs less uncertainty Rules for determining which digits are signi cant All digits are signi cant expects zeros that are used only to position the decimal points make sure that the measured quantity has a decimal point start at the left of the number and move right until you reach the rst non zero digit count that digit and every digit to its right as signi cant Zeros that end a number and lies either after or before the decimal point are signi cant 1 for addition and subtraction the answer has the same number of decimal places as there are in the measurement with the fewest decimal places 2 Multiplication and division the number with the least certainty limits the certainty of the result Therefore the answer contains the same number of sig gs as there ate in the measurements with the fewest sig gs 3 Exact numbers integers have in nite sig gs ex 4 atoms Rounding if it equals ve then you round up to the even but if it39s going to be an odd number then you don39t round up VI dimensional analysis really important a very useful problem solving methodology Handy for unit conversions conversion factors