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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, &amp; 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 &divide; 2.5 L
29. 64.0 g + 0.112 g
25. 256.0 g &divide; 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?
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