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Chem 133 Chap 1

Terms from chemistry chap 1

Accuracy how close a measurement is to the true value of the quantity
Chemical Property to observe this prop. chemical change(ex. burning)must occur
Chemistry the study of matter and the changes it undegoes.
Compound substance made of atoms of 2/more elements united in fixed proportions.
Density mass of an object divided by it's volume (d=m/v)
Element substance that can't be separated into simpler substs by chemical means.
Extensive Property depends on how much matter you considered (mass/volume).
Heterogeneous mixture comp of the mixture is not uniform(sand and iron fillings)
Homogeneous mixture composition of the mixture is uniform thruout(h2o and sugar)
Hypothesis a tentative explanation for a set of observations
Intensive property does not depend on how much matter you have (temp/density)
International System of Units revised metric system
SI International System of Units
Kelvin SI base unit for temperature(0K lowest temp theoretically possible)
Law concise verbal/math stmt of relatshp btwn phenom thats always the same under the same conditions.
Liter the volume occupied by one cubic decimeter (1dm^3) SI unit for volume
Macroscopic Property Props that can be determined directly(length,volume,mass)
Mass the measure of the amount of matter in an object (kg is SI unit for mass)
Matter anything that occupies space and has mass
Microscopic Property on the atomic or molecular side - must be determined by an indirect method.
Mixture combination of 2/more subs in which the subs retain their identities
Physical Property can be measured/observed w/o changing the comp/id of subs.
Precision how closely 2/more measurmnts of the same quant agree with one another
Qualitative general observs about the sys(can't be said as
Quantitative numbers obtained by various measurmnts of system (temp,time)
Scientific Method systemic approach to research
Scientific Method steps define problem,collect data, interpret data, repeat
Significant Figures the meaningful digits in a measured or calculated quantity
Substance form of matter that has definite/constant comp and distinct properties
Theory unifying princp that explains body of facts and/or those laws based on it
Volume measure of how much space an object occupies (SI unit is m^3-cubic meter)
Weight force that gravity exerts on object-changes with changes in gravity
Created by: melwandelt