Section: Name: PRE-LABORATORY QUESTIONS, EXPT. 2 CHEMICAL MEASUREMENTS To be com

Question

Section: Name: PRE-LABORATORY QUESTIONS, EXPT. 2 CHEMICAL MEASUREMENTS To be completed and handed in prier to the start of the laboratory period. Show all work. 1) (+1.5 points) Give the correct number of significant figures for the following numbers: a. 150875 b. 0.0106 3 c. 21180.0 e 4.03 x103 points) Give the correct answers for the following calculations; be sure to include the proper d. 21180 or f 4.030 x 10 4 a. 9.03 18mL 23 305 14274mL = b. 04460g . 26.9815g/mol o LG in decimal format - or in scientific notation c. 2.113g (0.145mL x0.162g/mL) PEn DAS 3) (1.5 points) The center of each circle below represents the "true" result and the x's are individual measurements. Label each circle as either: A: accurate and precise, B: accurate but not precise, C: precise but not accurate, or D: neither accurate nor precise. 19

Explanation / Answer

1) a. 5

    b. 3

    c. 6

    d. 5 or 4

    e. 3

    f. 4

2) a. 23.306 mL

    b. 0.0165 mol in decimal format

    1.65 10-2 mol in scientific notation

c. 2.09g

3) First circle D

Second circle C

Third circle A

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