1. Mr. Burkholder soburkho@smsd.org Ch 1 A PowerPoint Notes soburkho@smsd.org

2. Mass/ Matter is anything that has mass and takes up space. Wrong!!! Tell your chemistry teacher he was wrong. Mass: resistance to change in motion from a force. Which is harder to move: me or the wall? Therefore which has more mass?

3. Qualitative measurements- descriptive nonnumeric form. Opinion or survey example: How hot is it in here?

4. Quantitative measurements- definite form, numbers Can be measured with a device like a meter stick. ex: How hot is it?

5. Accuracy- closeness of a measurement to the actual value, correctness, or truth. How long are these pencils?

6. Precision- How close the measurements are to each other. Repeatability. or 12.5cm is more precise then 12cm

7. Is significant figures about accuracy or precision?

8. Add: significant figures to precision WOD?

9. Precision- How close the measurements are to each other or 12.5cm is more precise then 12cm (Similar to # of decimal places) Which is more precise? A.) 3 B.) 3.14 C.) 3.14159265

10. Precision- How close the measurements are to each other. For a GROUP of numbers, the smaller the range, the more precise. Which is more precise? A.) 3, 4, 5 B.) 3.14, 6.27, 9.14 C.) 3.14159265, 6.276584, 9.14159265

11. Precision- How close the measurements are to each other. For a GROUP of numbers, the smaller the range, the more precise. Which is more precise? A.) 3, 4, 5 Ans Range = 5-3 = 2 (Closest Grouping) B.) 3.14, 6.27, 9.14 Range = 9.14-3.14 = 6 C.) 3.14159265, 6.276584, 9.14159265 Range = 6

12. Explain accuracy and precision for each of the three targets?

13. Scientific notation: The first number must always have the correct number of sig figs.

14. 0.0001 = 1 x 10 -4 0.00045 = 4.5 x 10 -4 5.4= 5.4 x 10 0 0.000000001= 1 x 10 -9 45000000 = 4.5 x 10 7 How many significant figures?