Express the product of 4.0 × 10-2 m and 8.1 × 102 m using the correct number of significant digits.
A. 3.2 × 101
B. 3.24 × 101
C. 32.4
D. 30

C. 32.4 is the answer

Expert answered|migzptz|Points 2360|

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Asked 9/30/2011 1:11:10 PM

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Express the sum of 5762.7 and 67.2 to the correct number of significant digits.
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Asked 9/30/2011 2:52:57 PM

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In which of the following is number of electrons the ion contains given correctly?
A. H+ has 1 electron.
B. Br- has 34 electrons.
C. Al3+ has 16 electrons.
D. Ca2+ has 18 electrons.

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Updated 10/1/2011 2:44:26 PM

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