1. Review Questions Write your answer, and nothing else, on the white board. Work together with people around you. Hold up your answer, but don’t say it too loudly.

2. Which of these numbers has the most significant figures? 8.02 E 568,400.0100204540,000.0100204 (6 SF)

3. Round this number so that it has 3 significant figures: 3187.21 3190

4. Perform the following calculation and express your answer to the proper number of significant figures: 14 mL - 8.43 mL 6 mL

5. Perform the following calculation and express your answer to the proper number of significant figures: 4.784 g / 7.3 mL 0.66 g/mL

6. Perform the following calculation and express your answer to the proper number of significant figures: 1.24 cm x 1.29 cm x 1.17 cm 1.87 cm 3

7. What volume in mL would you record from this beaker? 16 mL (or 17 mL, or 13 mL, etc.) 30 20 10

8. How long is this object? 1.3 cm or 1.2 cm or 1.5 cm Even 1.8 cm would be an acceptable answer

9. How long is this object? 1.45 cm or 1.43 cm or 1.48 cm 1.4 cm or 1.5 cm would not be an acceptable answer

10. What temperature does this thermometer read? 30.0 o is correct, and so is 30.1 o or 29.9 o

11. Record mL measurements and the number of sig figs for these: 3.0 mL 2 SF 0.33 mL 2 SF 5.74 mL 3 SF

12. Change this number to scientific notation:.0006015 g 6.015 x 10 -4 g

13. Convert 12.5 g into ounces (1 ounce = 28.35 g) 0.441 ounces

14. Perform the following calculation and express your answer to the proper number of significant figures: 2.18 X 10 -5 g / 8.0 X 10 -8 cm 3 2.7 X 10 2 g/cm 3 or 270 g/cm 3

15. Convert the previous answer into the following unit: kg/m 3 Convert g to kg; 1000g = 1kg Convert cm 3 to m 3 ; 100cm = 1m You must convert cm to m three times in order to get m 3 270,000 kg/m 3 or 2.7 X 10 5 kg/m 3

16. You place a marble on a scale and measure its mass to be 8.450 g. You fill a graduated cylinder and measure its volume to be 34.5 mL. After placing the marble in the cylinder, the water level rises to 39.7 mL. Calculate the density of the marble. Subtract the initial volume from the final volume to get the volume of the marble (5.2; 2 SF due to the addition subtraction rule)) Divide mass by volume to get density Answer: 1.6 g/mL (2 SF due to the multiplication rule)