assignment 1 - Consider the isotope Bromine-81, Br Select...

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Question 1 Multiple Choice 1 points What is 252 MPa in kPa ? 2.52 × 10 5 2.52 × 10 11 2.520 2.52 × 10 -7 2.52 × 10 6 Ans:a Question 2 Multiple Choice 1 points How many significant figures are there in the result of the following calculation: 0.2979 J/g/°C × ( 33.560°C - 33.060°C) × ( 297.90 g) 4 2 1 5 3 Ans:a Question 3 Multiple Choice 1 points Pure ethanol has a density of 0.785 g/mL at 25C. What would be the mass of 11.4 mL of ethanol at 25C? 11.4 g 14.5 g 0.11 g 6.30 g 8.95 g Ans:e Question 4 Multiple Choice 1 points A solid object has a mass 6.20 g with a density of 1.80 g/mL. What volume of water is expected to be displaced if this object is fully submerged in a container of water ? 3.10 mL 0.290 mL 0.247 mL 2.93 mL 0.261 mL 3.44 mL Ans:e Question 5 Multiple Choice 1 points The chemical symbol for Calcium is ? Cm Ca Cf C Cs Question 6 Multiple Choice 1 points Bromine is the only nonmetal that is a liquid at room temperature.
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Unformatted text preview: Consider the isotope Bromine-81, Br Select the combination which lists the correct atomic number, neutron number, and mass number, respectively. 1 46, 81, 35 81, 46, 35 35, 81, 46 35, 46, 81 Ans:d Question 7 Multiple Choice 1 points Calculate the molar mass of (NH 4 ) 3 PO 4 . 153.56 g/mol 115.95 g/mol 104.62 g/mol 149.10 g/mol Ans:d Question 8 Multiple Choice 1 points What is the chemical formula for Ammonium Bromide (NH 4 ) 2 Br NH 4 Br NH 4 Br 2 NH 4 Br 3 NH 3 Br Ans:b Question 9 Multiple Choice 1 points P 4 S 10 is used in the manufacture of safety matches. What is the systematic name of this compound? tetraphosphorus decasulfide phosphoric sulfide phosphorus decasulfide phosphorus sulfide Ans: a Question 10 Multiple Choice 1 points How many moles of iron(III) oxide are there in 4.05g Fe 2 O 3 ? 0.0228 mol 647 mol 0.0216 mol 39.4 mol 0.0254 mol Ans: e 2...
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This note was uploaded on 10/16/2009 for the course CHM 104 taught by Professor Igor during the Three '09 term at Charles Sturt University.

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assignment 1 - Consider the isotope Bromine-81, Br Select...

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