Are you ready to take this lesson's quiz? These questions will help you find out. Make sure you understand why each correct answer is correct--if you don't, review that part of the lesson.
Which of the following can be defined as a measured value?
- 24
- 24 people
- 24 apples is the same as 2 dozen apples
- 24 grams
Measurements must include a number and a unit.
Exact measurements are counted values.
Exact measurements are defined conversion factors.
Measured values are made by a measuring instrument and include a number and a unit.
What is the correct number of significant figures in the value 0.03450 kg?
- 6
- 5
- 4
- 3
Leading zeros are not significant.
Zeros to the right of the decimal are only significant when they are in between other digits or at the end of the number.
All nonzero digits and trailing zeros to the right of the decimal are significant.
Zeros at the end of a number are significant if they are to the right of the decimal.
While working in the lab, you observe the volume shown in the image below.
What is the value that should be recorded?
- 8.3 mL
- 8.30 mL
- 8 mL
- 8.300 mL
The image shows a graduated cylinder with markings at every 1 mL. The measurement should be recorded with digits out to the tenths place for one estimated place value.
The value 8.30 mL could be recorded if the graduated cylinder had markings for every 0.1.
The value 8 mL could be recorded if the graduated cylinder had markings for every 10 mL.
The value 8.300 mL could be recorded if the graduated cylinder had markings for every 0.01 mL.
What is the result of the following calculation? Record to the correct number of significant figures.
23.096 \(\times\) 90.300 =
- 2085.5688
- 2085.56
- 2085.6
- 2085.5
When multiplying, the answer should not have more significant figures than the original values.
Sandwiched zeros as well as nonzero digits are significant.
The answer should be rounded to reflect the lowest number of significant figures of the original values.
When rounding, values of 5 and greater round up to the next whole number.
The labeled actual volume of a soda bottle is 2 liters. When you poured the soda into a measuring cup, you found there were only 1.8 liters. What is the absolute error for your measurement?
- 0.2%
- 0.2
- ±0.2
- 0.1%
Percent error is determined when dividing absolute error by the actual value.
The absolute error reflects the difference between the measured and actual values.
This reflects the range of measurements allowed when considering accuracy.
Percent error is determined when dividing absolute error by the actual value.
Summary
Questions answered correctly:
Questions answered incorrectly:
