Project Keys

Project Keys - CHEMISTRY 1103 Project #1 NAMES: (Please...

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CHEMISTRY 1103 Project #1 NAMES: (Please alphabetize by last names.) (7:30 Section) 1. A small cube of copper (d = 8.94 g/cm 3 ) measures 28.4 mm on a side. What is its mass in grams? ANSWER: 205 grams 2. You need to drive a distance of 195 km at a constant speed of 64 miles/hour. How many hours will it take you? HINTS: 1 meter = 1.094 yards 1 mile = 1760 yards ANSWER: 1.9 hours 3. How many molecules of C 2 H 6 O (Ethanol) are present in a 5.0 L sample with a density of 0.789 g/ml? ANSWER: 5.2x10 25 molecules CHEMISTRY 1103 Project #1 NAMES: (Please alphabetize by last names.) (8:30 Section) 1. How many pounds of Methanol does it take to fill an 18.5 gallon fuel tank? 1 kg = 2.205 pounds, 1 gallon = 4 quarts 1 liter = 1.057 quarts Methanol has a density of 0.791 g/cm 3 ANSWER: 122 pounds 2. Give the answer to the calculation below to the correct number of significant figures. All values represent measurements not exact numbers. (2.140 – 2.6x10 - 3 ) 1.62x10 5 ANSWER: 1.32x10 - 5 3. Thiophene, C 4 H 4 S, is used to manufacture pharmaceuticals. How many C atoms are present in 600.0 mg of Thiophene? ANSWER: 1.718x10 22 Carbon atoms CHEMISTRY 1103 Project #1 NAMES: (Please alphabetize by last names.) (9:30 Section) 1. Your vehicle gets 4.54 km/L in gas mileage. What is your gas mileage in miles/gallon? HINTS: 0.6214 mile = 1 km 1 liter = 1.057 quarts 4 quarts = 1 gallon
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ANSWER: 10.7 miles/gallon 2. You have a 3.282 cubic feet sample of Chloroform with a density of 1.483 g/ml. What is the mass of the sample in grams? HINTS: 2.54 cm = 1 inch, 12 inches = 1 foot ANSWER: 1.378x10 5 grams 3. Which sample below has the greatest number of atoms total? Estimate using what you know about a mole of each substance. a) 75 grams of As b) 60 grams of Ar ANSWER: b) c) 1.0x10 21 molecules of H 2 O 2
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PROJECT #2 CHEMISTRY 1103 Names: (Please alphabetize by last name.) 7:30 Section 1. Which of the following is named incorrectly? a) CCl 4 Carbon tetrachloride b) N 2 O 4 Dinitrogen tetroxide c) Al 2 O 3 Dialuminum trioxide d) Fe 2 O 3 Iron (III) oxide ANSWER: c) as ionic ones don’t need the prefix to tell you how many 2. A 3+ ion has 32 neutrons and 24 electrons. What is its correct isotopic notation? ANSWER: The element is Co and the mass number is 59, atomic number 27, and charge 3+ 3. Europium consists of two isotopes: Eu-151 with a mass of 150.92 amu and Eu-153 with a mass of 152.92 amu. Calculate the % abundance of Eu-151 if the average atomic mass of Eu in a natural sample is 151.965 amu. ANSWER: 47.75% Cu-151 PROJECT #2 CHEMISTRY 1103 Names: (Please alphabetize by last name.) 9:30 Section 1. Which of the following is named incorrectly? a) CS 2 Carbon disulfide b) CoCl 3 Cobalt (III) chloride c) Na 2 S Disodium sulfide d) S 7 O 2 Heptasulfur dioxide ANSWER: C) as ionic ones don’t use the prefixes to tell you how many 2. Nitrogen consists of two naturally occurring isotopes: N-14 with atomic mass of 14.003074 amu and N-15 with atomic mass of 15.000108 amu. What is the % natural abundance of
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Project Keys - CHEMISTRY 1103 Project #1 NAMES: (Please...

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