Chemistry Chemistry Practice Problems Solutions Library

Accuracy & Precision Solutions Library

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25 solutions

Accuracy & Precision

Q. Five students reported their results from an experiment to remove iron fillings (with a magnet) from a mixture with sand. Each student was given ex...

Solved • Sep 17, 2019

Accuracy & Precision

Q. A student performs an experiment to determine the density of a sugar solution. She performs 4 trials, measuring mass and volume each time. Her data...

Solved • Sep 12, 2019

Accuracy & Precision

Q. A 1.000 mL sample of acetone, a common solvent sometimes used as a paint remover, was placed in a small bottle whose mass was known to be 38.0015 g...

Solved • Oct 25, 2018

Accuracy & Precision

Q. Assume that you have two graduated cylinders, one with a capacity of 5 mL and the other with a capacity of 50 mL.Which cylinder will give the more ...

Solved • Oct 25, 2018

Accuracy & Precision

Q. The three targets from a rifle range shown below were produced by: (A) the instructor firing a newly acquired target rifle; (B) the instructor firi...

Solved • Oct 25, 2018

Accuracy & Precision

Q. Precision and accuracy.How would the darts be positioned on the target for the case of "good accuracy, poor precision"?

Solved • Oct 25, 2018

Accuracy & Precision

Q. Explain the difference between random error and systematic error.

Solved • Oct 25, 2018

Accuracy & Precision

Q. You have water in each graduated cylinder shown:You then add both samples to a beaker. How would you write the number describing the total volume? ...

Solved • Oct 16, 2018

Accuracy & Precision

Q. Consider the results of the archery contest shown in this figure.(b) Which archer is most accurate?

Solved • Oct 16, 2018

Accuracy & Precision

Q. These organic solvents are used to clean compact discs:The chemist analyzing the cleaner calibrates her equipment and finds that the pipet is accur...

Solved • Oct 12, 2018

Accuracy & Precision

Q. Three groups of students measure the mass of a product from the same chemical reaction. The groups recorded data of 8.83 g, 8.84 g, and 8.82 g. The...

Solved • Jul 3, 2017

Accuracy & Precision

Q. The density of lead is 11.3 g/cm3. The following table presents lead density data (g/cm3) collected by different groups of students. Determine whic...

Solved • Jun 15, 2017

Accuracy & Precision

Q. Precision is the measure of  a)  how close a measurement is to the “true” value b)  an object’s kinetic energy c)  how well repeated...

Solved • May 25, 2017

Accuracy & Precision

Q. Which of the following is NOT an exact number?A) Your weight in pounds.B) The amount of pennies per dollar.C) The number of milligrams in a kilogra...

Solved • Oct 7, 2016

Accuracy & Precision

Q. What is the difference between random error and systematic error?

Solved • Jul 18, 2016

Accuracy & Precision

Q. Indicate which of the following are exact numbers:(a) the mass of a 32-oz can of coffee(b) the number of students in your chemistry class(c) the te...

Solved • Jul 4, 2016

Accuracy & Precision

Q. Indicate which of the following are exact numbers:(a) the mass of a paper clip(b) the surface area of a dime(c) the number of inches in a mile(d) t...

Solved • Jul 4, 2016

Accuracy & Precision

Q. The three targets from a rifle range shown on the next page were produced by: (A) the instructor firing a newly acquired target rifle; (B) the inst...

Solved • Jun 28, 2016

Accuracy & Precision

Q. The following dartboards illustrate the types of errors often seen when one measurement is repeated several times. The bull's-eye represents the "t...

Solved • Jun 28, 2016

Accuracy & Precision

Q. Explain the difference between random error and systematic error.

Solved • May 19, 2016

Accuracy & Precision

Q. The percentage of water in an unknown hydrated salt is to be determined by weighing a sample of the salt, heating it to drive off the water, coolin...

Solved • May 11, 2016

Accuracy & Precision

Q. Two electric balances are tested using a standard weight. The true mass of the standard is 1.3111 g. The results of the 5 individual measurements o...

Solved • Apr 20, 2016

Accuracy & Precision

Q. Winnie the Pooh set out to help Rabbit count his carrots. However, Pooh has trouble counting and always leaves out the numbers 8, 9, and 10. The co...

Solved • Feb 5, 2016

Accuracy & Precision

Q. Consider the data obtained for the length of an object as measured by three students. The length is known to be 14.49350 cm. Which student has done...

Solved • Feb 4, 2016

Accuracy & Precision

Q. A chemist makes several measurements of the electrical conductivity of an unknown sample. With this information the chemist can discuss   A. The ...

Solved • Feb 4, 2016