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UP Academic League of Chemical Engineering Students (UP ALCHEMES) Academics Affairs Committee Review and Tutorials Program, AY 2012-2013 Chem 16 First Exam (SAMPLE EXAM) Avogadro’s number: 6.022 x 10 23 , C: 12 g; Mg: 24.3 g; O: 16 g; H: 1 g; S: 32 g; Cl: 35.45 g; Al: 26.98 g; Si: 28.09 g; F: 19 g; Fe: 55.85 g; Li: 7 g; Cu: 64 g; Na: 23 g I. True or False: Write TRUE if the underlined word makes the statement correct. If the underlined word makes it False, write the correct answer. 1. Physical properties can be observed in changes in composition. 2. Each component of a solution retains its own properties. 3. Most metals can be found in nature in their pure state. 4. Some of the neutron-poor nuclei, especially the heavier ones, decrease their neutron to proton ratios by undergoing alpha emission. 5. 58.44 g of sodium chloride contains 6.022 x 10 23 ions . 6. In the reaction between 50 mL 0.1 M NaOH and 26 mL 0.2 M HCl, NaOH is the limiting reagent. 7. 2KCl + Cu(NO 3 ) 2 → 2KNO 3 + CuCl 2 : This is an example of a double displacement reaction. 8. In order to prepare 85 mL of 0.3 M HCl from 12.1 M HCl, 4 mL of stock HCl solution must be diluted with water. II. Chemical Equations: Write the balanced chemical reactions for the following: 1. Pb 3 (PO 4 ) 2 + Zn(OH) 2 → Pb(OH) 2 + Zn 3 (PO 4 ) 2 2. Ferric oxide + carbon monoxide yield solid iron and carbon dioxide 3. The products of the complete combustion of butane (C 4 H 10 ) are carbon dioxide and water III. Multiple Choice 1. Which of the following compounds will contain the most number of oxygen atoms:
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