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# Chapter 2: Measurements

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### Transcript of "Chapter 2: Measurements"

1. 1. How do scientists express uncertainty in measurement? Chemistry BC High School Kuzara
2. 2. What is the length of the board?
4. 4. Is this any better?
5. 5. One last time…
6. 6. Reporting measurements using significant figures
7. 7. Reporting Measurements using significant figures
8. 9. Rules for determining significant figures
9. 10. How many significant figures? <ul><li>103 m </li></ul><ul><li>57.6080 s </li></ul><ul><li>0.024 g </li></ul><ul><li>120 kg </li></ul><ul><li>100.0 mL </li></ul><ul><li>250. km </li></ul>
10. 11. Rules for Making Calculations with Significant Figures
11. 12. Carry out the following calculations and report your answer with the correct number of significant figures.
12. 13. Rules for Rounding
13. 14. Round each value to three significant figures <ul><li>23.42 m </li></ul><ul><li>0.4059 s </li></ul><ul><li>45.75 L </li></ul><ul><li>110.59 g </li></ul><ul><li>23.851 kg </li></ul>
14. 15. Putting a number into scientific notation <ul><li>All numbers, regardless of magnitude, can be expressed in the form: N x 10 n where </li></ul><ul><ul><li>1<N<10 </li></ul></ul><ul><ul><li>n is a positive or negative integer </li></ul></ul><ul><li>When written in standard form there must be one digit, and only one digit to the left of the decimal point in the number N. </li></ul><ul><ul><li>standard: 1.23 x 10 6 </li></ul></ul><ul><ul><li>non-standard: 123 x 10 4 </li></ul></ul>
15. 16. Positive Exponents <ul><li>36,600 </li></ul><ul><li>exponent of 10 is a positive whole number </li></ul><ul><li>value of the exponent = number of places the decimal point must be moved so that the notation is in standard form. </li></ul><ul><li>36,600 x 10 0 Non-standard </li></ul><ul><li>3.66 x 10 4 Standard </li></ul>
16. 17. Negative Exponents <ul><li>0.00563 </li></ul><ul><li>exponent of 10 is a negative whole number </li></ul><ul><li>value of the exponent = number of places the decimal point must be moved so that the notation is in standard form </li></ul><ul><li>0.00563 x 10 0 Non-standard </li></ul><ul><li>5.63 x 10 -3 Standard </li></ul>
17. 18. Write each value in scientific notation.
18. 19. Convert to Scientific Notation <ul><li>727 m </li></ul><ul><li>17200.0 s </li></ul><ul><li>0.000984 kg </li></ul><ul><li>1.56 x 10 4 m </li></ul><ul><li>3.6 x 10 -2 kg </li></ul>Convert to Decimal Form
19. 20. Rules for calculations with scientific notation.
20. 21. Write this down! <ul><li>NEVER EVER </li></ul><ul><li>enter x 10 ^ into your calculator! </li></ul>
21. 22. Calculate
22. 23. Calculate
23. 24. Calculate
24. 25. SI Base Units
25. 26. SI Unit Prefixes
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