Name 1st Hour Ex. Chem 112-01 February 24, 2015 5% of Final Grade) Words of Wisd

Question

Name 1st Hour Ex. Chem 112-01 February 24, 2015 5% of Final Grade) Words of Wisdom:This test contains short answer questions and problems. For the problems, SHOW ALL YOUR WORK. I do not award credit without work. Take time and set-up the problems. You will get at least 80% credit for setting-up the problem correctly. BE NEAT . Anything not easily understood could be marked wrong. READ the question and THINK about you're being asked before you start to answer. Do NOT try to make the questions hard. Watch your units. This test contains 4 pages. Be sure you have a complete test and write your name on all pages. Turn off your cell phones and put them away. Use of such devices during a test is not allowed. All papers will be picked-up at 10:45 L Short Answers (2 points per blank, 30 points total) List 4 factors that affect reaction rate: 2. A reaction has been found to be second order in Reactant A and first order in Reactant B. Write the rate law for this reaction. 3. What are the units of rate of reaction ? 4 The series of individual steps that takes the system from reactants to products is called the Write the reaction quotient equation for the following reaction: 2 NO, (g)7H, (g) 2 NH, (g)4H,O (g) 6. Using LeChateliers Principle, predict the shift in the equilibrium o2 pressure because of the following stresses on the reaction. 2 CaSO,(s) 2 Cao (s) 2 SO, (g)O2 (g) a. Adding CaSO, b. Removing SO C Increasing the pressure

Explanation / Answer

7) pH = -log[H+] (negative of logarithmic value of the concentration of H+).

8) NaOH --> Na+(aq) + OH-(aq)
[OH-] = 0.001 M = 10-3 M
pH + pOH = 14
pH = 14 - pOH = 14 - (-log[OH-]) = 14 + log(10-3) = 14 - 3 =11

pH = 11

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