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Measurement, Uncertainty and Significant Figures
By Melanie Magdaleno
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Last updated 11 days ago
8 questions
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Instructions
You MAY use your notes packets to help you.
You MAY NOT talk to other students or seek help online.
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Question 1
1.
How many
estimated
digits are allowed in a measurement?
none
one
two
as many as the observer wants
Question 2
2.
Leading zeros (such as these 0.002) __________________count as significant figures.
always
never
sometimes
Question 3
3.
How many significant figures in the number
250
Question 4
4.
How many significant figures in 0.03064
Question 5
5.
How many significant figures in 15.0
Question 6
6.
Remember:
Accuracy measures how close results are to the true or known value.
Precision, on the other hand, measures how close results are to one another.
In your "Lab: Measurement in the Kitchen", your 4 trials of 1/4 cup flour resulted in 4 different mass measurements. This primarily shows...
The balance is not accurate
The scooping method is not precise
Question 7
7.
Remember:
Accuracy measures how close results are to the true or known value.
Precision, on the other hand, measures how close results are to one another.
In your "Lab: Measurement in the Kitchen", your 1/4 cup flour mass average was higher than the 30g listed on the nutrition label. This shows...
Measuring by scoop volume (1/4 cup) is not accurate.
Measuring by scoop volume is not precise.
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Question 8
8.
Record the volume of water in the graduated cylinder (in the previous slide) to the correct number of significant figures. Include proper units.
