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**“How do you evaluate data and conclusions to determine the validity of **

Essential Question “How do you evaluate data and conclusions to determine the validity of research?”

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Objectives 1. Define SI base units for time, length, mass and temperature. 2. Explain how adding a prefix changes a unit. 3. Compare the derived units for volume and density. 4. Express numbers in scientific notation.

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**Objectives 5. Define and compare accuracy and precision;**

6. Use significant figures and rounding to reflect the certainty of data; 7. Use percent error to describe the accuracy of experimental data; 8. Interpret graphs.

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**Significant Figures 1. All digits that are not zero, are significant.**

45678 5sf 2. Zero’s between non – zero digits and significant numbers. 7804 4sf 7 sf

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Significant Figures 3. Zeros to the left of the 1st non – zero digit are not significant. 2 sf 4. Zeros to the right of a decimal point are significant if the right of a decimal point are significant if they are at the end of the number. 4 sf 777.0 4 sf

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**Significant Figures 5. Always assume zeros at the end of a**

number to be non-significant Compare 3400 and 3400 has 2 sig fig has 5

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**Addition and Subtraction**

When adding or subtracting numbers, the answer should have as many places of decimal as the smaller or smallest place of decimal in the numbers being added or subtracted. Example: = 60.4 NOT should only have 1 place of decimal.

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**Multiplication and Division**

When multiplying or dividing numbers, the answer should have significant figures as many as the least number of significant figures in the numbers being multiplied or divided. For example: x 1.2 x 2.23 = 65 NOT

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**Division Example 465.75/45.6 must have 3 significant figures.**

Therefore, /45.6 = 10.2 NOT ….

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**Combined Multiple Operations**

If a problem combines addition or subtraction and multiplication or division, apply rules separately. That is, use places of decimal for addition and subtraction and significant figures to multiplication and division portion of the problem.

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**Combined Multiple Operations**

Example (9.12 – 8.9)/8.9 = 0.2/8.9 = 0.02 Note: (9.12 – 8.9) = 0.2 based on 1 pld 0.2/8.9 = 0.02 based on 1 sf in 0.2

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Significant Figures. Rule 1: Digits other than zero are significant 96 g = 2 Sig Figs 152 g = __________ Sig Figs 61.4 g = 3 Sig Figs21.567 g = __________.

Significant Figures. Rule 1: Digits other than zero are significant 96 g = 2 Sig Figs 152 g = __________ Sig Figs 61.4 g = 3 Sig Figs21.567 g = __________.

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