WA4_CHE-121-jun16.odt - Name:Xin Ding College ID:xin.ding...

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Name:Xin Ding College ID:xin.ding Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: OL121 Semester and year: July 2016 Written Assignment 4: Chemical Reactions Answer all assigned questions and problems, and show all work. Write the (a) balanced equation for the formation of liquid water from hydrogen and oxygen gas, and use it to explain the following terms: (b) chemical reaction, (c) reactant, (d) product. (12 points) O H O H 2 2 2 2 2  b.Chemical reaction is a process in which a substance or substances change into one or more new substances. Here refer to H2 and O2 reacts and water is the new substance. c. Reactant is the starting materials in the reaction. In this reaction, H2 and O2 are reactants. d. Water is the product which is the new substance formed in this reaction. Balance the following equations: (18 points) 2 C + O 2 2 CO 2 CO + O 2 2 CO 2 2 Na + H 2 O H 2 + 2 NaOH Zn + 2 HCl ZnCl 2 + H 2 2 NaOH + H 2 SO 4 2 H 2 O + Na 2 SO 4 2 NH 3 + 3 CuO 3 Cu + N 2 + 3 H 2 O Calculate the mass in grams of iodine (I 2 ) that will react completely with 20.4 g of aluminum (Al) to form aluminum iodide (AlI 3 ). (5 points) 3 2 2 3 2 AlI I Al  g x x 9 . 287 2 * 127 * 3 27 * 2 4 . 20 (Reference: Chang 3.47)
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