26.07.2021 Views

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

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

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

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

10. Perform each operation <strong>and</strong> express the answer to the correct number <strong>of</strong> significant<br />

figures.<br />

a. 3.00 ÷ 1.9979 = ?<br />

b. 2,300 × 185 = ?<br />

c. 16.00 × 4.0 = ?<br />

11. Use your calculator to solve each equation. Express each answer in proper scientific<br />

notation <strong>and</strong> with the proper number <strong>of</strong> significant figures. If you do not get the correct<br />

answers, you may not be entering scientific notation into your calculator properly, so<br />

ask your instructor for assistance.<br />

a. (5.6 × 10 3 ) × (9.04 × 10 −7 ) = ?<br />

b. (8.331 × 10 −2 ) × (2.45 × 10 5 ) = ?<br />

c. 983.09 ÷ (5.390 × 10 5 ) = ?<br />

d. 0.00432 ÷ (3.9001 × 10 3 ) = ?<br />

12. Use your calculator to solve each equation. Express each answer in proper scientific<br />

notation <strong>and</strong> with the proper number <strong>of</strong> significant figures. If you do not get the correct<br />

answers, you may not be entering scientific notation into your calculator properly, so<br />

ask your instructor for assistance.<br />

a. (5.2 × 10 6 ) × (3.33 × 10 −2 ) = ?<br />

b. (7.108 × 10 3 ) × (9.994 × 10 −5 ) = ?<br />

c. (6.022 × 10 7 ) ÷ (1.381 × 10 −8 ) = ?<br />

d. (2.997 × 10 8 ) ÷ (1.58 × 10 34 ) = ?<br />

ANSWERS<br />

1. Significant figures represent all the known digits plus the first estimated digit <strong>of</strong> a<br />

measurement; they are the only values worth reporting in a measurement.<br />

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

Saylor.org<br />

45

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!