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101 Cards in this Set
 Front
 Back
percentage error

percentage error= value experimentedvalue 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


nonnumerical 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
