Measurement: quantity with _______ and a _____. 42.5 g1.05 mL16 cm Measurement unit number.
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Transcript of Measurement: quantity with _______ and a _____. 42.5 g1.05 mL16 cm Measurement unit number.
a really big number: 100,000,000,000,000
(atoms in a cell)
or really small number: 0.000 000 000 01 meter
(size of one atom)
can be written without zeroesby using powers of 10.
ScientificNotation
100,000,000,000,000 = 1 x 1014 atoms (atoms in a cell)
0.000 000 000 01 meter = 1 x 10–11 meters (size of an atom)
ScientificNotation
Accuracy:how close to the actual or true value
Accuracy, Precision, and % Error
Precision:how close to each other (repeatable)
Error
% Error = (________) x 100 acc
Accuracy, Precision, and % Error
exp – acc
exp – experimental valueacc – accepted value
What is the % error if a measurement of 99.1oC is made, but the true temperature is 100.0oC?
% Error Calculation:
1. Which of the following expressions has NOT been correctly changed to sci. not.?
A. 0.00456 = 4.56 10–3
B. 0.0000254 = 2.54 10–5
C. 8,426,000 = 8.426 106
D. 45,200 = 4.52 103
Quick Quiz!