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The Basics of General, Organic, and Biological Chemistry, 2011

The Basics of General, Organic, and Biological Chemistry, 2011

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• Identify a quantity properly with a number <strong>and</strong> a unit.<br />

EXERCISES<br />

1. Why are both parts <strong>of</strong> a quantity important when describing it?<br />

2. Why are measurements an important part <strong>of</strong> any branch <strong>of</strong> science, such as chemistry?<br />

3. You ask a classmate how much homework your chemistry pr<strong>of</strong>essor assigned. Your<br />

classmate answers, “twenty.” Is that a proper answer? Why or why not?<br />

4. Identify the number <strong>and</strong> the unit in each quantity.<br />

a. five gr<strong>and</strong>children<br />

b. 16 c<strong>and</strong>les<br />

c. four score <strong>and</strong> seven years<br />

d. 40 days <strong>and</strong> 40 nights<br />

e. 12.01 grams<br />

f. 9.8 meters per second squared<br />

g. 55 miles per hour<br />

h. 98.6 degrees Fahrenheit<br />

ANSWERS<br />

1. <strong>The</strong> number states how much, <strong>and</strong> the unit states <strong>of</strong> what. Without the number <strong>and</strong> the<br />

unit, a quantity cannot be properly communicated.<br />

3. No, it is not a proper answer; you do not know whether the pr<strong>of</strong>essor meant homework<br />

problem number 20 or 20 homework problems.<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

27

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