1. 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

2. 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

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

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

5. 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)

6. 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

7. 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!