As chief chemist at Superior Analytical Products (SAP) you must design an experi
ID: 1005671 • Letter: A
Question
As chief chemist at Superior Analytical Products (SAP) you must design an experiment to determine the density of an unknown liquid to three (3) significant figures. The density is of the order of 1 g/cm^3. You have approximately 7 mL of the liquid and only graduated cylinders and balances are avaiTable for your use. Which of the following combinations of equipment will allow you to meet but not exceed your goal? a) Graduated cylinder with plusminus0.1 mL uncertainty; balance with plusminus0.1 g uncertainty b) Graduated cylinder with plusminus0.01 mL uncertainty; balance with plusminus0.1 g uncertainty c) Graduated cylinder with plusminus0.01 mL uncertainty; balance with plusminus0.01 g uncertainty d) Graduated cylinder with plusminus0.001 mL uncertainty; balance with plusminus0.001 g uncertainty e) Graduated cylinder with plusminus0.1 mL uncertainty; balance with plusminus0.001 g uncertainty Bud N. Chemist must determine the density of a mineral sample. His four trials yield densities of 4.77 g/cm^3, 4.67 g/cm^3, 4.69 g/cm^3, and 4.81 g/cm^3. Independent studies found the correct density to be 4.75 g/cm^3. Which of the following statements represents the best analysis of the data? a) Bud's results have much greater accuracy than precision. b) Bud's results have much greater precision than accuracy. c) Bud's results have high accuracy and high precision. d) Bud's results have low accuracy and low precision. e) Bud's equipment is faulty. Which of the following correctly expresses 52,030.2 m in scientific notation? a) 5.20302 ' 10^4 m b) 5.20 ' 10^4 m c) 5.20302 ' 10^5 m d) 5.2 ' 10^4 m e) 5.203 ' 10^4 m Which of the following correctly expresses 0.000007913 g in scientific notation? a) 7.913 ' 10^6 g b) 7.913 ' 10^-6 g c) 7.913 ' 10^5 g d) 7.913 ' 10^-9 g e) 7.913 ' 10^-5 gExplanation / Answer
26) Buds results are 4.77 g/cm3 , 4.67 g/cm3, 4.69 g/cm3 4.81 g/cm3
Correct density is 4.75 g/cm3
These results are results are much accurate than precise.
Thus, the correct option is 'a'
27) 52,030.2 = 5.20302 * 10^ 4
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