Percent and Absolute Error

In Chemistry, percentage error is used in measuring the accuracy of the data collected during an experiment?

• True

• False

The weight of a table measured by a student is 20 Kg. The actual weight of the table is 23 Kg. What is the percent error in the student's measurement?

• 43 %

• 3%

• 15%

• 13%

A Student determines the volume of a cube to be 4.6 cm³. What is the percent error if the the correct volume of the cube is 4.3 cm³?

• 8%

• 6%

• 7%

• 9%

An actual measurement of a sample is 3.5 cm. The measured value is 2.5 cm. What is the percent error in the measurement?

• 27%

• 40%

• 29%

• 10&

What is the percent error if the measured value is 30.0 g and the accepted value is 32.0 g?

• 6.67%

• 6.02%

• 6.25%

• None of the above

A student weighs a compound, they have 30 g. The student is supposed to have 40 g, what is the percent error?

• 50%

• 25%

• 20%

• 75%

The boiling point of a chemical (Ethanol) is 78.40 Degrees Celsius. A Student conducts an experiment and finds the boiling point of 75.0 Degrees Celsius. What is the percent error of the student's measurement?

• 3.57%

• 3.44%

• 96.56%

• 2.7%

The measured mass of a sample is 6.00 g. The actual mass of the sample is known to be 6.20 g. Calculate the error in the measurement.

• 0.20 g

• 12.0 g

• 0.60 g

• Nine of the above

The experimental value is higher than the the accepted value, the percent error will be a negative number.

• True

• False

Perecent Error is a common way of evaluating the precision of as measured value?

• True

• False