177Exam1KeySS06

177Exam1KeySS06 - PROF. JOSEPH BURNETT SUMMER 2006 THIS...

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PROF. JOSEPH BURNETT SUMMER 2006 THIS EXAM CONSISTS OF 18 QUESTIONS ON 9 PAGES CHEM 177 HOUR EXAM I June 1st, 2006 NAME______________________ RECITATION INSTRUCTOR CIRCLE ONE: Salil Sabnis Ziwei Just GRADING PAGES Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 TOTAL POINTS 16 pts 20 pts 14 pts 20 pts 15 pts 10 pts 5 pts 100 pts SCORE ________ ________ ________ ________ ________ ________ ________ NOTE: THE METHOD YOU USE IN SOLVING QUESTIONS MUST BE CLEARLY SHOWN IF YOU ARE TO RECEIVE FULL CREDIT. QUESTIONS ARE WRITTEN ON BOTH SIDES OF EACH PAGE. THE LAST PAGE CONTAINS A PERIODIC TABLE . THIS SHOULD BE REMOVED AND USED FOR ADDITIONAL REFERENCE AND SCRATCH PAPER. DO NOT PUT ANSWERS ON THE TEAR AWAY PAGE. Answer Key
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2 1. (4 pts) Which one of the following represents a chemical change? A. When iron oxide (rust) is ignited in the presence of aluminum, heat and light is given off and the rust is converted to pure iron and the aluminum to aluminum oxide. B. In the presence of sufficient heat, gold melts to form a liquid and addition of more heat, gold evaporates to form a gas. C. When a propane tank is opened and the propane escapes, the valve becomes cold enough to condense water out of the air. D. A heterogeneous mixture is filtered to separate the mixture into its components. E. A liquid solution containing alcohol and water is distilled to collect the alcohol. 2. Use the figures below to answer the following questions. Each of the symbols represents an atom of a different type: i. (2 pts) Which figure BEST illustrates a pure element ? ii. (2 pts) Which figure BEST illustrates a heterogeneous mixture ? iii. (2 pts) Which figure BEST illustrates a pure molecular compound ? 3. (4 pts) Three small cubes of identical mass are made of pure lead, pure silver, and pure gold. The cube with the largest volume is _______ . Densities at 25 o C [g/ml]: lead - 11.3; silver - 10.5; gold -19.3 A. lead B. silver C. gold D. Insufficient information has been provided to answer question. 4. (2 pts) True or False _________________ The nucleus of an atom occupies the majority of the volume of the atom. A B C D B D A False
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3 5. Complete and balance the following reaction equations. For full credit, include the phase of all products. i. (2 pts) 3 K 2 CO 3 (aq) + 2 Fe(C 2 H 3 O 2 ) 3 (aq) Fe 2 (CO 3 ) 3 (s) + 6 KC 2 H 3 O 2 (aq) ii. (2 pts) 2 HNO 3 (aq) + Ba(OH) 2 (aq) 2 H 2 O ( l ) + Ba(NO 3 ) 2 (aq) iii. (2 pts) N 2 (g) + 3 Mg (s) Mg 3 N 2 (s) iv. (2 pts) 2 C 3 H 8 O (g) + 9 O 2 (g) 6 CO 2 (g) + 8 H 2 O ( l ) v. (2 pts) _____________ (aq) + _____________ (aq) Ni(OH) 2 (s) + (NH 4 ) 2 SO 4 (aq) 6. Identify the reactions from the previous question as combustion, combination, decomposition, or metathesis. i.
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This note was uploaded on 03/26/2008 for the course CHEM 177 taught by Professor Greenbowe during the Summer '06 term at Iowa State.

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177Exam1KeySS06 - PROF. JOSEPH BURNETT SUMMER 2006 THIS...

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