University:
Thomas Jefferson University
Course:
CHEM 103 | Chemistry I
Academic year:

2024
Views:

202

Pages:

1
Author:

Imani H.

Measures how well repeated measurements agree with ezerother. Measures how well a measure agrees with the true value" can be precise without accurate Cannot be accurate with prearsion are equally likely to be too high or too low relative to the tue volue Randou Emors affect both precision & accenny NUMP Ore consistently off in the same direchen (high/bao) compared to the tore olur Susthmatic Enors affect assunsay but do not affect parersion. In theory, a systematic enor can be discovered and corrected An is a number obtained from counting (Ex: Idozen= 12 1095e=24) do not have uncertainty associated with Heu Numbers obtained from a measurement always have youve uncertainty. Measured numencal values are expressed in a way that reflects experimental uncertainly are the number of meaningful digits in a measured quantity. Significant Figures with adecimal point Stop at first nonzero digit left to right Ex: 0.002528f Ex: 1.200 = 4 s.f Ex: 01053s.f Ex = 0.00700-38.f Significant figures without a decisual pont right to left Ex: 10300 = s rigtig Ex: 130-2 sig fig For a number expressed in scientific notation, Axion, all digits in the number A are significant A 140010 5 4 sig figs. Multiplication & Dussion Ex: (2.8X45039) has 2 sig figs to answer will have 2 sigfogr = B Ex: 6.85/112.04-0.06113 sig figs Adliban & Sithachon fewest decimal places Ex: 20.4+1322 83.1 104.822 104.8 only one desmal place Ex 12900-11212633 12700 mind to nedraltits plane Ex: 35000+ 1250 3625036000 hundreds place Ex: 210+104=314-310 tenths place

New Documents from this Course

1.1-1.4 Chemistry in Context

Thomas Jefferson University CHEM 103 | Chemistry I

Lecture Note

1.5 Measurement Uncertainty , Accuracy and Precision

Related Documents

New Documents from this Course

Description

Related Documents

Free up your schedule!

Take 5 seconds to unlock