Extra Credit Worksheet – Module 1 2 points

__1. SCIENTIFIC NOTATION, SIGNIFICANT FIGURES, AND ROUNDING__

__Questions.__

**Change the following numbers to scientific notation (without rounding):**

1. 66,793 _____________________ 5. 97,000 (use 2 significant figures) _____________________

2. 543.621 _____________________ 6. 0.00004300 _____________________

3. 0.00643 _____________________ 7. 0.6 _____________________

4. 889,674.0 _____________________

**How many significant figures does each of the following measurements have?**

5. 36.2 cm _____________________ 10. 8.0 ns _____________________

6. 0.0041 mL _____________________ 11. 1,762,493 atoms _____________________

7. 175 kg _____________________ 12. 0.1176 g/mL _____________________

8. 2642 cars _____________________ 13. 6.04 m _____________________

9. 4.62×104 miles _____________________ 14. 970.0 yards _____________________

**Round the following Round the following**

**to 3 significant figures: to 2 significant figures:**

21 198.675 _____________________ 24. 112.6 _____________________

22. 6.2253 _____________________ 25. 30.792 _____________________

23. 7189.66 _____________________ 26. 9.65×10–4 _____________________

**Perform the following calculations and express the answer with the appropriate number of**

**significant figures:**

27. 73.62 + 112.9 = _____________________

28. 167.42 × 1.94 = _____________________

29. (46.21 × 2.55) (2.643 × 0.662) = _____________________

30. (22.614 19.3) / 19.3 = _____________________

__2. CONVERSIONS, DIMENSIONAL ANALYSIS, AND DENSITY__

__SHOW THE CALCULATIONS__

__Questions__

1. Convert 172 inches to millimeters.

2. Convert 6.2×1013 nanometers to miles.

3. How many milliliters are there in 12.6 gallons?

4. How many ounces are there in 3.471 micrograms?

5. How many yards are there in 5.62×104 kilometers?

6. Convert 68.2 F to Celsius

7. Convert 443.62 F to Kelvin.

8. Convert 3.00×108 meters per second to miles per hour.

9. What is the density of lead sulfide if a sample has a mass of 12.4 g and a volume of 1.64 cm3?

10. What is the mass of 176 cubic meters of iodine (density = 4.93 g/mL)?

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