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Learning Goal – to understand the importance of significant figures Questions over the reading Demonstrations with physical and chemical changes? Notes / practice with significant figures Homework

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Questions over Sec 3.1 and 3.2 1. What is the difference between a qualitative and quantitative measurement? a. Give an example of each. 2. Record 6,510,000 in scientific notation 3. Write out 1.54 x 10 -3. 4. Which set of measurements are the most precise? a. 3g, 2.5g, 2g b. 3.0g, 2.5g, 2.0g c. 1g, 2g, 3g d. 1g, 1.5g, 2.5g

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Why are significant figures important? What is the volume in the following containers? Always estimate the last digit

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What is the measurement of the metal bar based on the left and right rulers?

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Sig Fig Rules Imagine a map of the US: If the decimal is Absent, count from the Atlantic side If the decimal is Present, count from the Pacific side Always start counting with the first non-zero digit Pacific Side (decimal is present) Atlantic Side (decimal is absent)

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Lets Practice! Determine the number of sig figs in the following: 100 100. 40.0 0.0081 2.075 5000 1 sig fig 3 sig figs 2 sig figs 4 sig figs 1 sig figs

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Take out your planner and record your homework: Due Friday Finish Sig Fig wkst and check answers online Read and take notes over Sec 3.3, 3.4 & 3.5 Due Monday Sig Fig quiz on Moodle by Monday!

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1 Significant Figures (Sig Figs) Quantity includes all known digits plus one estimated digit = last digit of # Indicates precision 500 vs 500.01.

1 Significant Figures (Sig Figs) Quantity includes all known digits plus one estimated digit = last digit of # Indicates precision 500 vs 500.01.

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