AP Chemistry Ch. 1 Review

Which of the following figure(s) represent a result having high precision?

• a. Figure I only

• b. Figure II only

• c. Figure III only

• d. Figure I and Figure II

• e. Figure II and Figure III

Which of the following statements concerning these figures is correct?

• a. Figure I represents systematic error and Figure II represents random error.

• b. Figure I represents random error and Figure II represents systematic error.

• c. Figure I and Figure II represent random error.

• d. Figure I and Figure II represent systematic error.

• e. Figure III represents no errors.

Which of the following is the least probable concerning five measurements taken in the lab?

• a. The measurements are accurate and precise.

• b. The measurements are accurate but not precise.

• c. The measurements are precise but not accurate.

• d. The measurements are neither accurate nor precise.

• e. All of these are equally probable.

You measure water in two containers: a 10-mL graduated cylinder with marks at every mL, and a 1-mL pipet marked at every 0.1 mL. If you have some water in each of the containers and add them together, to what decimal place could you report the total volume of water?

• 0.01 mL

• 0.1 mL

• 1 mL

• 10 mL

• none of these

The agreement of a particular value with the true value is called

• accuracy

• error

• precision

• significance

• certainty

The amount of uncertainty in a measured quantity is determined by:

• both the skill of the observer and the limitations of the measuring instrument

• neither the skill of the observer nor the limitations of the measuring instrument

• the limitations of the measuring instrument only

• the skill of the observer only

• none of these

A scientist obtains the number 0.045006700 on a calculator. If this number actually has four (4) significant figures, how should it be written?

The beakers shown below have different precisions as shown. Suppose you pour the water from these three beakers into one container. What would be the volume in the container reported to the correct number of significant figures?

• 78.817 mL

• 78.82 mL

• 78.8 mL

• 80 mL

• 79 mL

You are asked to determine the perimeter of the cover of your textbook. You measure the length as 36.71 cm and the width as 24.83 cm. How many significant figures should you report for the perimeter?

• 1

• 2

• 3

• 4

The density of gasoline is 0.7025 g/mL at 20°C. When gasoline is added to water:

• It will float on top.

• It will sink to the bottom.

• It will mix so, you can't see it.

• The mixture will improve the running of the motor.

• None of these things will happen.