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### 101 Cards in this Set

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 percentage error percentage error= value experimented-value accepted / value accepted * 100 accuracy refers to the closeness of measurements to the correct or acccepted value of the quantity measured precision refers to the closeness of a set of measurements of the sam quantity made in the same way darts within small area high precision area centered on bulls eye high accuracy darts within small area high precision area far from bullseye low accuracy darts within large area low precision significant does not mean certain in a measurement consist of all the digits known with certainty plus one final digit which is uncertain or estimated significant number TABLE 3 studyyyyyyyy it adding & subtracting answer same number of digits to the number witht the least amnt of digits to right of decimal pt. for rounding whole #s (without decimal pts.) round answer so that the final sign. digit is in the same place as the leftmost uncertain digit (5400 + 365= 5800) density = ? mass / volume ? / volume = density mass multiplication/ divison rounding rules the answer can have mo more significant numbers than are in the measurement with thte fewest significant numbers 4 steps to solving problems analyze plan compute evaluate direct proportion describes 2 quantities when divided one by the other gives a constant value inverse proportion describes 2 quantities when multiplied by each other gives a constant value refers to the closeness of a measurement to the correctto the correct or accepted value accuracy refers to the closeness of calues for a set of measurements precision the difference between the experimental and the accepted value that is divided by the accepted value and then mult. by 100 percentage error the significant figures in a number consist of all digits known with certainty plus one final digit, which is uncertain t/f exact conversion factors are completely CERTAIN and DO NOT LIMIT THE NUMBER OF DIGITS IN A CALC. true a number written in scient. not. is of the form ___________ in which M is ___ or ____ to1 but ___ less than ___ and n is an ____ M X 10 n; less =; integer two quantities are direct. proport if _______________ constant value dividing one by the other gives a constant value two quantities are inversely proportional to each other if _______ constant value their product has a constant value a logical approach to solving problems that lend themselves to investigation scientific method testable statement that serves as the basis for predictions and further experiments hypothesis broad generalization that explains a body of known facts or phenomena theory the result of every measurement is ____ and ___ number & a unit the ______ system of measurement is used in science. SI how many base units in SI system 7 length meter mass kilogram time second temperature kelvin amount of substance mole electric current ampere luminous intensity candela measure of the gravitational pull on matter weight area square meter volume cubic meter sq. meter and cubic meter ex. of _____ derived units ratio of mass to volume density wht are conv. factors used for? to convert from one unit to another how do you convert from one unit to another? by conversion factors the use of senses to obtain info observe numerical info quantitative non-numerical info qualitive a specific portion of matter in a given region of space that has been selected for study during an experiment or observation system when u observe a reaction in test tube test tube and contents form system what does exper. involve to make observations and collect data carrying out a procedure under controlled conditions scientists have to do wht to make a hypothesis make generalizations about data stages in scient method ... observing, formulating hypothesis, testing, theorizing, publish results the experimental conditions that remain constant controls any condition that changes variable effects of wht usually causes change? variable hypothesis has to be changed if. testing reveals that the prediction was incorrect more than a phys object model often an explanation of how phenomena occur and how data / events related model models may be visual, verbal, mathematical one imp model in chem is atomic model - matter is omposed of tiny particles called atoms if a model successfully explains many phenomena, wht might happen? become part of a theory when are theories considered successful if they can predict the results of many new experiments kinetic molecular and collision theory ex. of imp theories something that has magnitude size or amount quantity ________ represent quantities measurements teaspoon is _____ volume is ______ unit of measurement; quantity combos of SI base units form ________ derived units length l mass M time t temperature T amount of substance mole electric current ampere luminous intensity I(sub v) M mega 10^6 k kilo 10 ^3 d deci 10 ^ -1 c centi 10 ^-2 m milli 10 ^ -3 u micro 10 ^ -6 n nano 10 ^ -9 p pico 10 ^ -12 A area square meter m^2 V volume cubic meter m^3 D density kilograms per cubic meter kg/m^3 M molar mass kilograms per mole kg/mol V(sub m) molar volume cubic meters per mole m^3/mol E energy joule J amount of space occupied by an object volume derived SI unit of volume cubic meters, m^3 name pascal gives name for pressure pa 1 L = ___ cm^3 1000 ml = ________ cubic centimeter kg/m^3 or g/L density density is a ___ property of a substance physical does size affect density no ratio derived from equality between 2 diff units that can be used from one unit to the other conversion factor a mathematical technique that allows you to use units to solve problems involving measurements dimensional analysis