MIDTERM STUDY (unit 2) Flashcards
Accuracy:
how close a measurement or attempt is to the actual or target value
*True value
Precision:
How consistent your results are regardless of proximity to actual or target
Experimental value:
value obtained through experimentation in the lab
Actual value:
true expected value
Significant figures:
(Sig figs) all known digits of a measurement and one estimated digit
Sig figs used to…
show precision of a measurement
RULES for determining significant digits: (4)
1) all non-zero #’s are significant
2) Sandwiched zeros (btwn two significant digits) are significant
3) Zeros not significant
4) zeros which are to the right of a decimal, and the right of a nonzero are significant
RULES for determining significant digits in #’s larger than one: (3)
1) zeros are not significant
2) zeros followed by a decimal are significant
3) Zero with a line over it is significant. The rest following it are not
(calculating with sigfigs) Adding and Subtracting:
Count places -> least farther out to right
(calculating with sigfigs) Multiplying and Dividing:
Least # of sigfigs
Scientific Notation:
method of representing very large or very small #’s in a standard format
Dimensional Analysis:
math technique that allows the use of units to solve problems w/ measurements
Metric System:
The Great Man King Henry Died Unusually Drinking Chocolate Milk Underestimating Near Peasants
( Tera, Giga, Mega, Kilo, Hecto, Deka, BASE UNIT, Deci, Centi, Milli, micro,nano,pico)
BASE UNIT:
M - 10 millies in 1 centi
L- 10 centi’s in 1 deci
G- 10 deci’s in 1 unit
When recording a measurement:
record known values & estimate one more place
