Unit 2 Lesson 2

Scientific Tools&

Measurements

1. Check T or F to show whether you think each statement is true or false.

T F__ __ A lab journal or notebook is considered a scientific tool.__ __ Scientists worldwide use the same units of measurement.__ __ It is sometimes appropriate for scientists to estimate measurements.__ __ Precision describes how close a measured value comes to the true value of the measurement.

1. Check T or F to show whether you think each statement is true or false.

T FX __ A lab journal or notebook is considered a scientific tool.X __ Scientists worldwide use the same units of measurement.X __ It is sometimes appropriate for scientists to estimate measurements.X __ Precision describes how close a measured value comes to the true value of the measurement.

2. Describe how the scientist might use this electron microscope for a scientific investigation.

2. Describe how the scientist might use this electron microscope for a scientific investigation. The scientist may be studying an object to small to see with just her eyes.

3. Use the context clues to write your own definition for the term standard.

3. Use the context clues to write your own definition for the term standard.

Something that has been defined as a value for comparison.

4. Define each of the following:MeasurementScientific notationAccuracyPrecision

4. Define each of the following:Measurement: A description that includes a number and a unit.Scientific notation: A short way of representing very large or very small numbers.Accuracy: Description of how close a measurement is to the true value of the quantity measured.Precision: The exactness of a measurement.

5. What is the difference between a description and a measurement?

5. What is the difference between a description and a measurement?

A description is a statement that explains an observation .

A measurement is a description that includes a number and a unit.

6. Which units of measurement is this recipe (page 78) are not standard?

6. Which units of measurement is this recipe (page 78) are not standard?

Dash and pinch

7. Omit but read page 78.

8. Using the table on page 80, identify the measurement associated with each tool in the image below.

A.

B.

8. Using the table on page 80, identify the measurement associated with each tool in the image below.

A. Mass

B. Time

9. As you read, underline the prefix that means “1/1000”.

9. As you read, underline the prefix that means “1/1000”.

Milli

10.The table below (page 81) shows how prefixes can be used with the unit for length. Complete the table by filling in the blanks.

Prefix Symbol Number of Meterskilometer km hm 100decameter dam 10millimeter mm 0.001

10.The table below (page 81) shows how prefixes can be used with the unit for length. Complete the table by filling in the blanks.

Prefix Symbol Number of Meterskilometer km 1,000hectometer hm 100decameter dam 10millimeter mm 0.001

11. The diameter of a human red blood cell is 0.000006 m. Write the diameter is scientific notation.

11. The diameter of a human red blood cell is 0.000006 m. Write the diameter is scientific notation.

6 x 10-6

12. Draw a fourth set of horseshoes that represents low accuracy and low precision.

12. Draw a fourth set of horseshoes that represents low accuracy and low precision.

U

I U

U U U

13. Choose an everyday object, and design a method to measure that object that is both accurate and precise. What tool or tools would you use? Explain your answer.

13.Choose an everyday object, and design a method to measure that object that is both accurate and precise. What tool or tools would you use? Explain your answer.

Measure a board using a tape measure. This would be able to measure both length and width accurately than a meter stick which has a limited length.

14. What is the difference between a compound light microscope and an electron microscope?

14. What is the difference between a compound light microscope and an electron microscope?A compound light microscope uses lenses to magnify objects.

An electron microscope uses electrons to produce images of those objects.

15. List the tools in this image (page 84) that are necessary for performing an experiment.

15. List the tools in this image (page 84) that are necessary for performing an experiment.Pipette, test tube, test tube rack, beakers, pencil, notebook, and goggles.

16. Magnetic resonance imaging (MRI) scanners use electromagnetic waves to generate images of the inside of a person’s body. How might MRI technology be used to investigate how the brain works?

16. Magnetic resonance imaging (MRI) scanners use electromagnetic waves to generate images of the inside of a person’s body. How might MRI technology be used to investigate how the brain works?An MRI scanner produces images of the brain’s structure that otherwise could not be seen without surgery.

17. The SI unit for mass is the kilogram/newton.

17. The SI unit for mass is the kilogram/newton.

18. The SI unit for time is the hour/second.

18. The SI unit for time is the hour/second.

19. A series of lenses is used to magnify small objects is a compound light microscope/scanning electron microscope.

19. A series of lenses is used to magnify small objects is a compound light microscope/scanning electron microscope.

20. A common container in the laboratory used for holding small samples of a liquid is a hot plate/test tube.

20. A common container in the laboratory used for holding small samples of a liquid is a hot plate/test tube.

21. Computers may be used at every stage/only to calculate results of a scientific investigation.

21. Computers may be used at every stage/only to calculate results of a scientific investigation.

22. A sensor that connects directly to a computer to collect data is called a calculator/probe ware.

22. A sensor that connects directly to a computer to collect data is called a calculator/probe ware.

23. Why are tools and technology important fo scientific investigations?

23. Why are tools and technology important fo scientific investigations?Tools and technology allow scientists to conduct research that they would not otherwise to able to conduct.

Scientists use tools and technology to gather, record, analyze, and share their data.

Lesson Review

Draw a line to connect the following terms to their definitions.1. Precision A. Closeness to the true value2. Accuracy B. Description with a unit3. Measurement C. Way to write very large or small numbers4. Scientific D. The repeatability of a notation measurement

1. D (precision is the repeatability of a measurement)

2. A (accuracy is the closeness to the true value)3. B (measurement is a description with a unit)4. C (scientific notation is a way to write very

large or small numbers)

5. Which of the following is not an advantage o using SI units?

A. Allows scientists to compare observations and results.

B. Can compare measurements make years apart.C. Based on the number 5, which is easy to use in

calculations.D. Uses prefixes to express measurements that are

small or large.

5. Which of the following is not an advantage o using SI units?

A. Allows scientists to compare observations and results.

B. Can compare measurements make years apart.C. Based on the number 5, which is easy to use in

calculations.D. Uses prefixes to express measurements that are

small or large.

6. What is 0.003 in scientific notation?A. 10 x 103

B. 3 x 10-3

C. 3 x 103

D. 10 x 3-10

6. What is 0.003 in scientific notation?A. 10 x 103

B. 3 x 10-3

C. 3 x 103

D. 10 x 3-10

7. What is the SI unit for temperature?A. The kelvinB. Degrees CelsiusC. Degrees FahrenheitD. The newton

7. What is the SI unit for temperature?A. The kelvinB. Degrees CelsiusC. Degrees FahrenheitD. The newton

8. Name the type of measurement the student in the photo on page 87 is making.

8. Name the type of measurement the student in the photo on page 87 is making.

Volume

9. The prefix for the measurement the student is making in this photo is milli-. What does milli-mean?

9. The prefix for the measurement the student is making in this photo is milli-. What does milli-mean?

1/1000

10. The student in this photo measured volume of water as 80.0 mL. Is her measurement accurate? Explain.

10. The student in this photo measured volume of water as 80.0 mL. Is her measurement accurate? Explain.Her measurement is accurate because it is very close to the actual volume of the water.

11. How might the student’s recorded data differ if she were simply describing the liquid instead of measuring it?

11. How might the student’s recorded data differ if she were simply describing the liquid instead of measuring it?

She would describe the liquid’s properties, such as color, rather than a numerical value.