Percent Error in Chemistry

What can be calculated by comparing the accuracy of an experimental measurement to the accepted value?

• percent composition

• percent error

• percent daily value

• percent by mass

The accepted boiling point of a substance is 90 degrees Celsius. During a lab a student records the boiling point at 91 degrees Celsius. What is the percent error?

• 90 degrees Cesius

• 91 degrees Celsius

• 1 degree Celsius

• 1.098%

A chemist measured the amount of caffeine in a new energy drink called FlipOUT to be 84.20 mg. The correct amount of caffeine is 87.10 mg. Calculate the percent error.

• 9.6%

• 3.4%

• 3.3%

• 0.033%

In our "percent error" equation, the EXPERIMENTAL value is:

• The value the scientist got from the experiment

• The accepted/target value

What is the formula for calculating percent error in chemistry?

A student measures the density of a liquid to be 1.05 g/mL. The accepted density is 1.00 g/mL. What is the percent error?

• 5%

• 4.76%

• 0.05%

• 1%

If the accepted value of a chemical reaction yield is 80% and the experimental yield is 76%, what is the percent error?

• 5%

• 4%

• 3%

• 2%

In an experiment, the boiling point of a liquid is measured as 102°C, while the accepted boiling point is 100°C. Calculate the percent error.

• 2%

• 1%

• 0.5%

• 3%

The accepted concentration of a solution is 0.50 M, but a student finds it to be 0.48 M. What is the percent error?

• 4%

• 2%

• 1%

• 0.5%

A scientist measures the mass of a sample to be 5.2 g, while the accepted mass is 5.0 g. What is the percent error?

• 4%

• 2%

• 1%

• 0.5%