CHAPTER 1:UNIT OF MEASUREMENT
1. i) ii) iii) Write the SI prefixes for : nano and deci milli and mega kilo and centi
2. 6.0 km is how many micrometers? 3. How many milliliters is 0.005 L? 4. Lead melts at 601.0 C. What temperature is this in F? 5. Many home freezers maintain a temperature of 0 F. Express this temperature in C 6. Liquid nitrogen boils at –195.8 C. Express the boiling point of liquid nitrogen in kelvin. 7. Dry ice (carbon dioxide) changes from a solid to a gas at –78.5 C. What is this temperature in F? 8. How many square kilometers are equivalent to 28.5 cm ? 9. Report the results of the following calculations to the correct number of significant figures. i) 423.1K to°C ii) 6.167 + 83.1 5.3 iii) (13.7 + 0.027) × 8.221 iv) 8.52010 ×7.9 + 1.93 v) 218.7201 – 218.63 –4 vi) (1.5 ×10 × 61.3) + 2.01 10. Determine the number of significant figures in each of the following measurements. i) 311.080 K ii) 0.0899 g/L 5 iii) 4.300 x10 atoms iv) 2.0 kg 9 v) 1.050 vi) 1.3070 11. The density of ammonia gas under certain conditions is 0.625 g/L. Convert its density into ng/mm . 12. Convert 6020 cm to nm . 13. How many significant figures are indicated by the following? 2 a) 3.340 x10 b) 0.0030 c) 1.080 d) 2.12 14. Consider a single piece of aluminum foil that is 1.0 m long, 304 mm wide and 0.60 mm thick 3 and the density of Al is 2.70 g/cm . a) How many grams of Al are there in the piece of foil?
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15. In 1828, the diameter of the U.S. dime was changed to approximately 18 mm. What is this diameter when expressed in nanometers?
SM/AS/CHM138/UiTM NS
CHAPTER 1:UNIT OF MEASUREMENT
16. Express the following number in scientific notation. i) 26.7 ii) 0.000053 17. A block of iron has a mass of 826 g. What is the mass of a block of magnesium that has the same 3 ; 3 3 graphite, 1.8 g/cm ; iron, 7.9 g/cm . 18. The density of lead is 11.4 g/cm at 25 C. Calculate the volume occupied by 25.0 g of lead.
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