Question

How many milliliters is 0.005 L? A. 0.5 mL B. 5 mL C. 0.50 mL E. 200 mL Iron has a density of 7.86 g/cm^3. The volume occupied by 55.85 g of iron is A. 0.141 cm^3 B. 7.11 cm^3 C. 2.8 cm^3 D. 439 cm^3 E. None of the above Express the number 0.000053 in scientific notation. A. 5.3 times 10^-2 B. 5.3 times 10^-3 C. 5.3 times 10^-4 D. 5.3 times 10^-5 E. 5.3 times 10^-6 The number 1.050 times 10^9 has how many significant figures? A. 2 B. 3 C. 4 D. 9 E. 6 How many significant figures does the result of the following sum contain? 8.5201 + 1.93 A. 1 B. 2 C. 3 D. 4 E. 5

Answer 1

8) B

9) B

10) D

11) C

12) B

Rules for Multiplication

* Multiply the numbers.

* Round result to the same number of sig figs as least precise value.

13) C

Rules for Addition

*Add the numbers.

*Round result to the same number of decimal places as least precise value.

B 9) B 10) D 11) C 12) B Rules for Multiplication * Multiply the numbers. * Round result to the same number of sig figs as least precise value. 13) C Rules for Addition *Add the numbers. *Round result to the same number of decimal places as least precise value. 8) 1 L = 10^+ 2 ml so 0.005l = 5 ml Ans b) 9) Density = p = mass/volume p = 7.86 = 55.85/ v v = 55.85/7.86 = 7.106 cm^3 = 7.11 cm63 Ans) B 10) 0.0000 53 implies scientific Nolan = 5.3 times 10^- 5 Ans D) 11) Ans c implies 4 12) Ans) B implies 3 13) Ans) c implies 3