Download Chemistry Exam: General Chemistry I - CHEM103 and more Exams Chemistry in PDF only on Docsity! Exam I CHEM103 Name__ September 25, 1998 General Chemistry I Section 31 Prof. J.M. Bellama TA____ DIRECTIONS; 1. Do not open the examination until the "start" signal is given. You may fill in the above section immediately. 2. PRINT your name on this and each page of the examination. Also write the correct section number and the name of your TA in the block above. 3. Please use ink, but not red ink. 4. Failure to follow above directions will result in a five point penalty. 5. In problems: a. All work must be shown. No credit awarded for answers without correct method of solution neatly and logically shown. b. Answers must be expressed to correct number of significant figures. 6. Writing must stop when the end of the exam is announced. A penalty will be enforced! Scoring: Parti 1 ___ 2a ___ 2b ___ 3 ___ 4 ___ 5 ___ 6 ___ 7 ___ Partn 1 TOTAL Name_____________________^_ PART I. CALCULATIONS 1. A friend is trying to find the identity of a compact disk cleaner. Since densities of various solvents are readily available, finding; the density would identify the solvent. Helping your friend, you find, that 25.00 mL of the substance has a mass of 19.625 g at 20° C. What is the density of the cleaner? 2. Aspirin (C9HgO4) can be synthesized by reacting salicylic acid (CyHgOa) with acetic anhydride (C4H6O3). The balanced equation is C7H6O3 + C4H6O3 --> C9H8O4 + HC2H3O2 a. Calculate the mass of acetic anhydride needed to consume (completely) 1.00 x 102 g of salicylic acid. b. What is the maximum mass of aspirin (the theoretical yield) that could be produced in this reaction? -1- 7. a. The element "terrapinium" (chemical symbol Tp) has an atomic number of 118 and an atomic mass of 306. i) The number of protons is ______. ii) The number of neutrons is ____ iii) The number of electrons in Tp2+ is b. Write the product(s) of the reactions (need not be balanced) i) K + 02 -» ii) Na + H2O -* PART II. NOMENCLATURE (22 points) 1. Write the correct chemical formula for each of the following substances: a. sodium dihydrogen phosphate b. potassium acetate c. ammonium cyanate d. barium nitride e. ferric carbonate 2. Write the correct chemical name for each of the following substances: a. Cf2(SO3)3 (Stock system) b. Mg(HC03h c. d. CuCl (common name) e.KMnO4 f. NiCl2«6H2O -4-
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