Name: 1. 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) (a) 2H2 + O2 = 2H2O (b) Chemical reaction: The chemical reaction is the rearrangement of atoms into different combinations, but exact combinations in which new substances forms have different properties than the original substances. In this equation energy is released in the form of heat. The Hydrogen gas and Oxygen gas combine to form liquid water. (c) Reactants: The reactants are the starting substances Hydrogen and Oxygen. They are both elements and both have atomicity 2. This means that a molecule of Hydrogen has 2 atoms and a molecule of Oxygen has 2 atoms. (d) Product: The new substance formed is water. The compound form is H2O. Water is a covalent bond. In every molecule of water 2 Hydrogen atoms are sharing their total of 2 electrons with Oxygen, which has 6 electrons in its outermost shell. 2. Balance the following equations: (18 points) a. 2 C + O 2 → 2 CO b. 2 CO + O 2 → 2 CO 2 c. 2 Na + 2 H 2 O → H 2 + 2 NaOH d. Zn + 2 HCl → ZnCl 2 + H 2 e. 2 NaOH + H 2 SO 4 → 2 H 2 O + Na 2 SO 4 f. 2 NH 3 + 3 CuO → 3 Cu + N 2 + 3 H 2 O 1 Copyright © 2017 by Thomas Edison State University . All rights reserved.
3. 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) 2Al + 3I2 = 2AII3 Al (# of moles reacting) No of moles = mass/molar mass = 20.4/26.98 =0.756 2AI + 3AII3 = 2AII3 2(0.756) of Al reacts with 3(0.756) moles of Iodine moles of Iodine = 3(0.756) = 2.268 moles
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