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LARN 156 C39D4

Start the following in class:

1. Write your journal entry on sheets of three holed 8.5 inch by 11 inch ruled paper in your Journal notebook. In the upper right corner white space of each upward facing page, write your hand in number within a circle followed by your name. Each journal entry should either be at least a paragraph of exemplary writing and penmanship concerning a single topic, or be a concept map relating chemistry terms. Begin each day’s paragraph with a topic sentence, follow with explained instances, and close with a focused summary statement.  Rather than just to find answers to questions, the goal of journaling is to reflect on, synthesize, and clearly express your thoughts in statements of your own understanding, so do not paraphrase material from other sources that you do not understand.

a. The required journal focus topics, J156A, for today are

a. What is the difference between an equilibrium constant expression for water, Keq, and the equilibrium expression for the self-ionization of water, Kw?

b. What is the difference between an equilibrium constant expression for an acid, Keq, and an acid dissociation constant expression, Ka?

c. What is the difference between an equilibrium constant expression for a base, Keq, and a base dissociation constant expression, Kb?

d. What is the difference between strong and weak acids?

e. What does the magnitude of the acid dissociation constant, Ka, reveal about the strength of the acid?

f. What does the magnitude of the base dissociation constant, Kb, reveal about the strength of base?

1.b. The second required learning journal assignment, J156B, for today is as follows.  On your learning journal page record the answers to these four questions:

a. What is the similarity in the formulas of a Brønsted-Lowry acid and its conjugate base? 

             Please make your answer to this question longer than a sentence.

b. What is the similarity in the formulas of a typical Brønsted-Lowry acid and an Arrhenius acid?  Please give an example of formulas of both a Brønsted-Lowry acid and an Arrhenius acid.

c. What is the similarity in the formulas of a typical Brønsted-Lowry base and an Arrhenius base?  Please give an example of formulas of both a Brønsted-Lowry base and an Arrhenius base.

d. What is the similarity in the formulas of a typical Brønsted-Lowry base and a typical Lewis base?  Please give an example of the formula of both a typical Brønsted-Lowry base and a typical Lewis base.

2.a. Use the PQ5R or SQ5R method to prepare study guide for text section 19.3 on Strengths of Acids and Bases or go to https://socratic.org/chemistry  to research the topics brought up in section 19.3 of your text.  Read section 19.3 in your chemistry text, pages 605 through 611, and as you do, create a study guide using  the SQ5R or PQ5R method explained in class and on the distributed  handout packet. You may record vocabulary entries in the body of your study guide, or you may check them off on the chapter 19 vocabulary list  that was distributed as you think about the meanings of the terms and  add any notations to the vocabulary list for clarifications sake.

2.b.  After you have finished reading the assigned section of the chapter, answer the formative assessment questions and do some formative assessment problems to inform you about the degree of your comprehension and understanding.  Assessment questions are printed at the end of the section that you have just read.  Reflect on your answers to assure yourself that you have understood the major points in the section that you have just read.  Record your responses to questions that are challenging you, so that you can later review what you are learning.  If all problems seem easy to you, record the response to the problem that was least easy for you to answer.

Writing in blue or black ink, place your hand in number in a circle followed by your name in the upper right white space of a piece of three holed composition paper that hasn’t been written on.  Place the page reference for the problems to be considered to the left of the red marginal line on the first blue line.  Centered on the first blue line, write a descriptive title for the learning activity such as Section C1.4 Responses where C1.4 represents Chapter1.section4.  Before you write your response to each question or problem listed below, write its designation to the left of the red marginal line as listed below, followed by your response in ink to the right of the marginal line.

If solving the problem entails the use of multiplication or division, show your work by including a ? followed by the unit of the quantity you are solving for, an = sign, followed by the quantity given that has all or part of the dimensions of whatever quantity you are solving for, followed by mathematical operations on all labeled quantities, conversion ratios or comparison ratios that are used to obtain the sought for quantity.

  • Study Sample Problem 19.5 on page 610 which shows howto calculate a value for the acid dissociation constant, Ka, of a weak acid having a known formula, given the pH or [H+(aq)] of an aqueous solution of a solution of known nominal acid concentration at 25.0 °C.
  • FYI: Both acid dissociation constants, Ka, of weak acids and base dissociation constants of weak bases, Kb, are also called ionization constants, Ki, by some chemists.
  • Study Sample Problem 19.5 on page 600, do and show your work for practice problems I19-22 (In chapter 19, problem 22), and I19-23.
  • In the Section Assessment 19.3 on page 611, read, analyze, describe and explain practice problems I19-24ab (In chapter 19, problem 24ab), I19-25ab, I19-26, I19-27 and do and show work for practice problems I19-28abcd [For this problem sequence, show the correctly written formula, phase, and coefficient for each reactant and product, and show the check for mass and charge balance for each expression.], and I19-29ab.

After you have finished responding to the formative assessment questions and problems, check page R99 of the text and check each of those problems that you can by writing in either a check mark (√) or a correction in green ink.  Write down any question that you still have so that you can ask about it in class.  In the margin of your notebook page, circle the number of formative assessment questions do not have a suggested response given and check your response with that of your classmates when you come to class.

Recommended for those who have time left in their 45 minute study period, but not required of all:

  1. Continue to review the meanings of the words on the chapter 1, chapter 2, chapter 3, chapter 4, chapter 5, chapter 7, chapter 8, chapter 9, chapter 10, chapter 11, chapter 12, chapter 13, chapter 14, chapter 15, chapter 16, chapter 17, chapter 18, and chapter 19 vocabulary lists.  Place a – symbol in front of each word that you have to study more, and a change the- to a + symbol in front when you have demonstrated mastery over the word to a study buddy, parent, or friend.
  2. Read and study the Study Guides given on pages 33, 57, 95, 121, 148, 180, 206, 246, 280, 314, 346, 378, 406, 438, 464, 498, 534, 580, and 624 of the text.  Review the Key Concepts for each text section and clarify in your mind under what circumstances would it be helpful to use each of the different relationships shown in the Key Equations section.