Accuracy and Precision

Question 1

An empty beaker has a mass of 75.0 g. Salt is added to the beaker until it has a total mass of 108.06 g. Using the correct number of significant figures, what is the mass of the salt?

Revolt · Accepted Answer

33.1 g

Question 2

Which measurement has three significant figures?

Revolt · Accepted Answer

105 m

Question 3

Tonya collects data to determine the speed of sound in air.

Revolt · Accepted Answer

precise but not accurate

Question 4

Which digits in a measurement are always significant? Check all that apply.zeros to the left of the decimal pointzeros between nonzero numberszeros to the right of the decimal pointnonzero numberszeros to the right of both the decimal point and a nonzero numberzeros to the left of both the decimal point and a nonzero number

Revolt · Accepted Answer

zeros between nonzero numbers; nonzero numbers; zeros to the right of both the decimal point and a nonzero number

Question 5

Four students use the centimeter ruler shown to measure an object during an investigation.

Revolt · Accepted Answer

The data have high precision but poor accuracy because of a systematic error.

Question 6

Four students measure the volume of an object that has an accepted value of 75.0 mL. They post their results in a table. Which set of data is most likely the result of a systematic error?

Revolt · Accepted Answer

X

Question 7

Which shows zero as significant digits? Check all that apply.0.027.56043060470,230

Revolt · Accepted Answer

7.560; 604; 70,230

Question 8

Which scenario describes a random error?

Revolt · Accepted Answer

A sudden storm raises the humidity in a lab for an hour.

Accuracy and Precision Answers

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