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Fall 07 HW1 - Be sure to fill in the complete X A Z symbol...

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Homework Assignment #1 1. Chapter 1, Problem 1, 39, 46, 53, 55 (Show the number before AND after rounding), 59, 67, 74, 78 2. Chapter 2, Problem 5, 6, 40, 49, 131, 140, 151 (Instead of using colors, give the symbols of the elements for your answer). 3. Chapter 2, Problem 17. Include the table below that shows the mass of each reactant and product in each experiment. Mass of Reactants Mass of Material Present After Mass of Elements Consumed in the Reaction Experiment #1 Experiment #2 4. a) The center on a basketball team is 7 ft 1 in tall. How tall is he in centimeters (cm)? Show all conversion factors in your answer. b) The area of a telescope lens is 5465 mm 2 . What is the area of the lens in square cm (cm 2 )? c) What is the area of the lens in problem 2b in square feet (ft 2 )? 5. The volume of a certain bacterial cell is 1.65 μ m 3 . a) What is its volume in mm 3 ? b) What is the volume occupied by 5.08 x 10 4 cells? 6. Fill in the following table.
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Unformatted text preview: Be sure to fill in the complete X A Z symbol. Symbol # of protons # of neutrons # of electrons Se 79 34 37 48 37 + 2 40 20 Ca 16 16 18 7. Until yesterday, Gallium was thought to only have two isotopes, 69 Ga and 71 Ga. A new isotope has been found, 72 Ga! The masses and abundances are listed in the table below. Find the “new average atomic mass” by taking the weighted average. Element % abundance Isotopic mass 69 Ga 40.11 % 68.9256 amu 71 Ga 31.62 % 70.9247 amu 72 Ga 28.27 % 71.9235 amu 8. a) Copper has two naturally occurring isotopes, 63 Cu and 65 Cu. Based on the atomic mass listed on the periodic table, which is present in greater abundance? Explain. b) Chapter 2, Problem 49. 9. a) Calculate the mass of 3.25 x 10 19 Ni atoms. b) How many atoms are present in 14.25 g of Au atoms. c) Calculate the molar mass of Al 2 (SO 4 ) 3 . d) Calculate the number of oxygen atoms in 3.45 grams of CuCO 3 ....
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