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

2024
Views:

202

Pages:

1
Author:

Imani H.

Measurement Uncertainty Accuracy E Precision 1 5 , . Precision : - racy measures : can be how well be agrees measure with the"twe 2 Ex value". Random Systematic Errors : : In theory , a Errors affect Numbers accuracy too low relative to the twe from a measured numencal values Figures nificant : Stop at (high/low) first expressed in a way of - 105 : 2 s f . = . Ex 1 200 : Ex 35 f . left to . = with have that = I case 12 = 24 them some digits = . in a uncertainty. measured f 3 s . For 103* a : 3 number * f expressed . + the 10-6 in number : left Ex : /= sighg In 1 400 to 2 sigfig scientific notation A are 4 sigfgs , Ax10" all significant. A = 12800 - 0 . 0610-3sighgs 104 822 = . . , digits one = - 112 decimal place = 12688 : > - 12700 round to hundredths place = 20+ 104 ↳ a right 83 1 + Ex = 00 + 1290 ↳ hundreds EX . uncertainty reflects experimental meaningful S = 000 1 322 . ↳ right 4 + only Ex -Significant figures without decimal point Ex : 04 so answer will have decimal places . to the tre value. . (EX : Idozen counting measurement always digit nonzero 20 4 : discovered and corrected the number are compared Snificant figures with decimal point 025 : . ↳ a Ex 85/112 . : - not affect precision obtained from are fewest Ex uncertainty associated have value. . same direction be can number a is obtained . quantity the in & high or Enors affect accuracy but do e rror systematic not be too both pression consistently of are exact number do equally likely to are Systematic Ex : 6 : sigigs Addition & Subtraction . accurate with precision Random Errors ↳ a Division Multiplicatond . with eachother precise without accurate Cannot An repeated measurements agree measures how well : 36260 + 36000 place 314 tenths place > - 36 104 8 . Isigtgs a

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