Reading Questions Page 42 And 59

Ledgerwood Period D Chem 1H

Eamon Barkhordarian 8/31/09

Homework #5 Reading Questions pg. 42 and 59 I. Page 42 1.

What are the standards needed for measuring quantities?- Units

of measurement. Si measurement. 2. a. 5.0 g/mL-density b. 37 s-time c. 47 J-energy d. 39.56 g-mass e. 25.3 cm3-volume f. 325 ms-time g. 500 m2-area h. 30.23 mL-volume i. 2.7 mg-mass j. 0.005 L-volume 3. a. 10.5 g= 0.0105 kg b. 1.57 km= 1570 m c. 3.54ug= 0.000354 g d. 3.5 mol= 35000 umol e. 1.2 L = 1200 mL f. 358 cm3= 0.0358 m3 g. 548.6 mL= 548600 cm3 4. a.

b.

Ledgerwood Period D Chem 1H

Eamon Barkhordarian 8/31/09

c.

d. 5. a. 84.7 g/ 49.6 cm3 = 1.06 g/cm3 b. 84.7/7.75=10.92 49.6/10.92= 4.54 cm3 6. yes the student is performing the calculation correctly because for every 1 gram there are 1000 milligrams, which is what he wrote. II. Page 59 8. a. meters b. centimeters c. kilometers d. micrometers 9. a. kilograms b. grams c. grams 12. a. cm3 and m3 b. in3 and ft3 . They are the American terms not the SI. 13. a. liquids and solids are generally expressed in g/mL. Gases are kg/m3 or kg/m3 b. g/cm3 or g/mL c. Density varies with temperature. Most objects expand as temperature increases. 15.

Ledgerwood Eamon Barkhordarian Period D 8/31/09 Chem 1H a. Conversion factor-ratio derived from the equality between two different units that can be used to convert from one unit to another. b. You isolate the term you want to find out and plug in the conversion factor to get the answer you want.