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PRACTICE FOR CHAPTER 2 Scientific Notation: Express values in scientific notation. 1. 2. 3. 4. 0.000238 840.2 2000 2000.0 5. 6. 7. 8. 0.004080 780 43.080 0.0660 Expressing values using different units: Convert values into the desired units. Use scientific notation. 9. 388 mm = __________km 11. 0.546 kL = _________dL 13. 248 g = _________mg 10. 0.006590 dg = ______ kg 12. 4,703 m = _________dm 14. 0.00238 cm = ______km Significant Figures: How many significant figures are in each value? 15 .00450 L _____ 16. 2005.8 g ______ 17. 150 km ______ 18. 0.02004 mg _____ 19. 100.0 g _____ What is the difference between numbers 19, 20, & 21? 20. 100. g _____ 21. 100 g _____ 22. How many significant figures are in #1 - #8? Expressing values with correct significance: Use your calculator to solve these problems, then express your answer with correct significance and using scientific notation. 23. 2.45 g x 0.04 g 28. 64 g + 0.112 g 24. 0.004 L ÷ 2.5 L 29. 64.0 g + 0.112 g 25. 256.0 g ÷ 28 mL 30. 280 L + 1 L 26. 300 km x 2.56 km 31. 281 L + 1 L 27. 28.0 x 13 32. 0.84 cm - 0.0632 cm PRACTICE PROBLEMS IN ALGEBRA AND PROBLEM SOLVING Try and use ‘unit cancellation’ method to set up and solve these problems. Remember, you can use relationships as numerical ratios; miles/gal or gal/mile, $/cookie or cookie/$, grams/mole or mole/gram. 1. If your car got 26.8 miles per gallon and you had 14.2 gallons in your car, how far could you drive? 2. If oreo cookies cost $1.85 per package and each package contains 36 cookies, how much does each cookie cost? 3. There are 1000 milligrams (mg) in one gram (g) and 1000 grams in one kilogram (kg). How many milligrams are in 2.68 kilograms? 4. If gas costs $3.87 per gallon and your car gets 33.0 miles per gallon, how far could you drive if you spent $78.28 on gas? 5. How many grams of copper would you have if copper has a molar mass of 65.3 grams per mole and you have 28.2 moles of copper? 6. How many moles of copper would you have if you have 0.775 grams of copper and the molar mass is 65.3 grams per mole? 7. If 12.0 moles of lead weigh 2.486 x 103 grams, what is the mass of one mole of lead (MM)? 8. A box of oreos weighs 248 grams and costs $2.38. A gallon of ice cream weighs 360 grams and costs $2.95. Which delicious food costs the least per gram?