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Measurement Lab 2 Significant Figures Calculations

Learn to take accurate measurements & apply significant figures rules in calculations. Assess your skills through labs and practice activities.

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Measurement Lab 2 Significant Figures Calculations

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  1. Measurement Lab 2Significant Figures Calculations

  2. Objectives: • Use proper technique to make accurate and precise measurements. • Apply the rules for significant figures to calculations. • Informal Assessment: • Monitoring student interactions and questions as they complete the measurement lab and significant figures practice • Formal Assessment: • Analyzing student responses to measurement lab and significant figures practice • Common Core Connection • Use appropriate tools strategically • Attend to precision • Make sense of problem and persevere in solving them

  3. Lesson Sequence Evaluate: Warm-Up Explain: Measuring to the Correct Sig Figs Elaborate: Measurement Lab Trial 2 Evaluate: Significant Figures Inquiry Elaborate: Significant Figures Practice Explain: Significant Figures Calculations Elaborate: Significant Figures Calculation Practice Evaluate: Exit Ticket

  4. Warm - Up • What techniques can be used in lab to ensure that you are taking accurate and precise measurements? • How many decimal points can a ruler be measured to?

  5. Objectives: • Today I will be able to: • Use proper technique to make accurate and precise measurements. • Apply the rules for significant figures to calculations.

  6. Homework • Finish Significant Figures Calculations WS • Study for Significant Figures Quiz on Wednesday, September 2

  7. Agenda • Warm-Up • Measuring to the Correct Sig Figs • Measurement Lab Trial 2 • Significant Figures Inquiry • Significant Figures Practice • Significant Figures Calculations • Significant Figures Calculation Practice • Exit Ticket

  8. Draw this table on the back of your measurement lab Complete the table as Ms. Ose explains how to take measurements using the correct number of significant figures

  9. Measurement Lab Trial 2 Travel to the stations in the lab and measure the mass, volume or length to the correct number of decimal places Record the number of sig figs in your trial 2 measurement. Record your answers on the poster on the board

  10. Class Discussion • How do the trial 2 measurements differ from the trial 1 measurements? • Why are significant figures important?

  11. Take out the Sig Fig Inquiry Worksheet Class review of Significant Figure Rules

  12. Significant Figure Practice Complete the practice at your desk.

  13. Significant Figure Notes

  14. Atlantic Pacific Rule

  15. Atlantic Pacific Rule • If a decimal point is Present as in 52.3 km, count from the “Pacific Side” from the first nonzero digit to the end. Meaning, count from the left side of the number - 52.3 has 3 sig figs - How many sig figs in .0093077 - There are 5 sig figs (start counting at 9)

  16. Atlantic Pacific Rule • If the decimal point is Absent, as in 1530 g, count from the Atlantic Side beginning with the first nonzero digit and going to the end, counting any zero as significant. This means start from the right - 1530 g has 3 sig figs • How many sig figs in 190,542,100ml - There are 7 sig figs

  17. Examples • .0026702 m - 5 • 19.0750 kg - 6 • 25,000,000,000 mm - 2 • 1,908,150 L - 6 • 520 ml - 2 • .0102 ns - 3

  18. Sig Fig Calculations • You cannot be more precise than your least precise measurement • In multiplication and division, the measurement with the smallest number of sig digits determines how many digits are allowed in the final answer • If you have several steps, carry the extra digits. Only the final answer is rounded

  19. Examples • 6.15 m x 4.026 m = ? - 6.15 m has 3 sig figs - 4.026 m has 4 sig figs - Your answer can only have 3 sig figs - 24.7599 m2 24.8 m2

  20. Examples • .03287 g x 45.2 g = ? - .03287 g has 4 sig figs - 45.2 g has 3 sig figs - Your answer can only have three sig figs - 1.485724 g  1.49 g

  21. Final Note • When doing calculations with significant figures, conversion factors do not figure in • Counts and defined numbers are EXACT and have no uncertain digits • Example: if you say there are 6 people in your family it is a counted number and is considered certain. There are not 6.1 people in your family • Example: 12 inches = 1 foot is defined – do not use significant figures. 1 foot will never be 11.99 inches. In both cases, significant figures do not apply

  22. Significant Figures Calculation Practice Complete the practice at your desk. Problems not completed in class will become your homework.

  23. Exit Ticket • Complete the calculation to the correct number of sig figs. • 4.21 X 5.5270 = • 5.126 – 2.2 = Icebreaker: • If you could turn yourself into something different (car, animal, plant, etc) for one week, what would it be? • Would you rather be 4 inches tall or 100 ft tall?

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