Discussion:
Chemistry: Unit Conversion and Significant Figures
1. Write each of the following as standard numbers.
- 1.2×104s
- 8.25×10-2kg
- 4×106g
- 5×10-3m
2. How many significant figures are in each of the following measurements?
- 20.60 L
- 200.66 g
- 4.00 m
- 18.4 °C
- 780 060 000 g
3. Round off each of the following measurements to three significant figures.
- 1.854 kg
- 163.4476 L
- 0.004 738 265 cm
- 7996 m
4. Perform each of the following calculations, and give answers with the correct number of decimal places:
- 41.74cm + 4.893cm
- 23.90g + 104.4g+0.015g
- 169.080mL- 21.0mL
- 1.14L- 0.630L
5. Perform each of the following calculations and give answers with the correct number of significant figures:
- 300×190
- 2.80/(4)(135)
- 0.819×3.4×5.7
- 5.3×0.252/5.86×30.0
6. Use metric conversion factors to solve the following problems.
The height of a student is 173 cm. How tall is the student in meters?
A cooler has a volume of 5500 mL . What is the capacity of the cooler in liters?
A hummingbird has a mass of 0.0059 kg . What is the mass of the hummingbird in grams?