s. The density of pure gold is 19.32 g/ml. A student performs dhte is 19.32 g/ml
ID: 698910 • Letter: S
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s. The density of pure gold is 19.32 g/ml. A student performs dhte is 19.32 g/ml.. A student performs three separate expemen to b82g/ to determine the density of a test sample of pure gold and finds them to 18.15 gml and 18.27 g/mL. The student's data is an example ot.. A) good accuracy and good precision. D) good accuracy but poor precision. B) poor accuracy but good precision. E) none of the above C) poor accuracy and poor precision. 9. Express the number 0.000053 in scientific notation. A)53x1o- B) 53x10-3 C)5.3 x 10- D) 5.3 x 10-s E)5.3 × 106 How many significant figures are there in 0.3070 g? A) 6 B) 5 C)4 D)3 E) 2 10. 11. What is the correct answer for the following calculation, reported using the proper number ofsignificant figures: 38251x 3.1×5555? A) 658.7013455 B) 658.7 C) 660 D) 66 E) none of the above 12. What combination of protons, neutrons and electrons correctly represent the nuclide below? A) B) C) 37 87 protons, 37 neutrons, 85 electrons 50 protons, 37 neutrons, 50 electrons 37 protons, 87 neutrons, 39 electrons 87 Rb2 D) E) 37 protons, 50 neutrons, 35 electrons 37 protons, 50 neutrons, 37 electrons 13. Which of these elements is chemically similar to potassium? A) calcium B) arsenic C) phosphorus D) cerium E) cesium 14. Which ionic compound is formed when aluminum ion (Al) and sulfide (S2) combine? 15. What is the name of MnCL4? A) manganese tetrachloride B) manganese chloride C) manganese(l) chloride D) monomanganese tetrachloride E) manganese(IV) chloride 16. Barium sulfate is used in manufacturing photographic paper. What is its formula? A) BaSO. B) Ba(SO) C) Ba:SO D) Ba(SO E) BaSO,Explanation / Answer
8) C. The answer the student gets is precise as we can see the answers are calculated upto 2 decimal points and not just being rounded off. But the accuracy is very poor as the observed density value extremely deviates from the standard value. So these deviation indicates the inaccuracy of the results.
9) D. Scientifc notation tells us to represent numbers instead of zero's and give a substantial value in a presentable form. 5.3 * 10-5
10) D. 3 because the the zero after 7 does not hold any value as it is on the decimal side of the number.
11) B) 658.7 as the decimal values dont change the actual value by a larger factor.
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