Measurement, Uncertainty and Significant Figures

Last updated 4 months ago

8 questions

Instructions

1

You MAY use your notes packets to help you. 
You MAY NOT talk to other students or seek help online.

How many estimated digits are allowed in a measurement?

none

one

two

as many as the observer wants

Leading zeros (such as these 0.002) __________________count as significant figures.

always

never

sometimes

How many significant figures in the number
250

How many significant figures in 0.03064

How many significant figures in 15.0

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

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. 

Record the volume of water in the graduated cylinder (in the previous slide) to the correct number of significant figures. Include proper units.

How many estimated digits are allowed in a measurement?

none

one

two

as many as the observer wants

Leading zeros (such as these 0.002) __________________count as significant figures.

always

never

sometimes

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

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. 

Measurement, Uncertainty and Significant Figures

Measurement, Uncertainty and Significant Figures

How many significant figures in the number250

How many significant figures in 0.03064

How many significant figures in 15.0

Record the volume of water in the graduated cylinder (in the previous slide) to the correct number of significant figures. Include proper units.

How many estimated digits are allowed in a measurement?

Leading zeros (such as these 0.002) __________________count as significant figures.

How many significant figures in the number250

How many significant figures in 0.03064

How many significant figures in 15.0

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...

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...

Record the volume of water in the graduated cylinder (in the previous slide) to the correct number of significant figures. Include proper units.

How many significant figures in the number
250

How many significant figures in the number
250

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...

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...