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Chem. Ch. 1

QuestionAnswer
what is a theory or (model) set of tested hypothesis that gives an overall explanation of some natural phenomenon
what is a hypothesis a possible explanation for an observation
what is the law of conservation of mass observation that the total mass of materials is not affected by a chemical change in those materials
what’s the difference between a law and a theory a law summarizes what’s happens ; theory (model) is an attempt to explain what happens
Mass; name the units used and the abbreviation kilograms, kg
Length; name unit and abbreviation meter, m
Temperature; name unit and abbreviation kelvin, K
electric current, name unit and abbreviation ampere, A
amount of substance, name unit and abbreviation mole, mol
luminous intensity, name unit and abbreviation candela, cd
what is the exponential notation for the number 1,000,000,000,000 10^12
measurements always have some degree of ______. uncertainty
what is accuracy agreement if a value with the true value
what is precision degree of agreement amoung several measurements of the same quantity
what are the two different types of error when referring to precision and accuracy random and systematic
what is random error (indeterminate error) measurement has equal probability of being high or low
what is systematic error (determinate error) occurs in the same direction each time; either always high or always low (problems with equipment)
high precision amoung several measurements is an indication of accuracy only if ______ _____ is absent. systematic error
what is 1.00 x 10^10 1,000,000,000
how many significant figures in the number 100 and why 1 because there is no decimal place behind the zeros. trailing zeros without a decimal place are NOT significant figures
how many significant figures does the number 100.00 have and why 3 because there is a decimal which makes all numbers before it significant figures.
how many significant figures does 8.050 x 10^ -3 (0.008050) have 4
when multiplying or dividing (with different numbers of significant figures) how should your result be written? the result is the same as the number with the least precise measurement.
when adding or subtracting sig figs the result should be written how same number of decimal places as the least precise measurement
mixtures can be classified as what 2 things and what do they mean homogenous (having visibly indistinguishable parts) heterogenous (having visibly distinguishable parts)
a homogenous solution mixture is called a _____ solution
what is distillation how readily substances become gases
what’s are the 3 methods of separation distillation - filtration - chromatograph
what is chromatography consists of two phases, stationary and mobile. stationary is a solid and mobile is either a liquid or gas
Created by: Awsten Beaver