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Measurements Prelab 2020

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User Generated

Subject

Chemistry

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Homework

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Name:___________________ Roster #:______ Lab Day/Time: ______________________
Prelab Week 2: Measurements
1. For Ruler A, provide the measurement that corresponds with the black line: ______22_____ cm
2. For Ruler B, provide the measurement that corresponds with the Black line: _____23______ cm
3. For Ruler C, provide the measurement that corresponds with the Black line: _____22.5______ cm
Bonus: Which of the three rulers has the greatest accuracy? Ruler C has the greatest accuracy
4. How many significant figures are in the following mass values?
a. 25.150 g: _____5_______
b. 0.0025 g: _____2_______
5. Define Accuracy and Precision. Give an example of each.
Accuracy can be defined as the closeness of a measured value to a known standard or value. For
instance, I measured the density of water in the laboratory and got 1.9g/cm
3
, but the actual density of
water is 1g/cm
3
, then my measurement is not accurate. While precision refers to the nearness of two or
more measurements to each other. Using my example above, let’s say I measured the density five times
and got 1.9 g/cm
3
each time, then my measure is very precise.

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Name:___________________ Roster #:______ Lab Day/Time: ______________________ Prelab Week 2: Measurements 1. For Ruler A, provide the measurement that corresponds with the black line: ______22_____ cm 2. For Ruler B, provide the measurement that corresponds with the Black line: _____23______ cm 3. For Ruler C, provide the measurement that corresponds with the Black line: _____22.5______ cm Bonus: Which of the three rulers has the greatest accuracy? Ruler C has the greatest accuracy 4. How many significant figures are in the following mass values? a. 25.150 g: _____5_______ b. 0.0025 g: __ ...
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