LARN 157 C40D1
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 first required focus questions, J157A, for today are
a. For what reasons is every Arrhenius acid-base neutralization reaction classifiable as a double replacement reaction?
b. What are the products of the reaction of an Arrhenius acid and an Arrhenius base?
c. Write the net ionic equation for the reaction of an Arrhenius acid and an Arrhenius base.
d. What is the relationship between the end point of a titration and the equivalence point?
e. How does one calculate the number of moles of acid required to neutralize a given number of moles of base of known formula when the chemical equation for the neutralization reaction is known? [Hint: study Sample Problem 19.6 on page 614.]
f. How does one determine the concentration of an acid by titration, given the chemical equation for the neutralization reaction, the volumes of acid and base used to arrive at the end point of the titration, and the known nominal concentration of the the base of known formula? [Hint: study Sample Problem 19.7 on page 616.]
1.b. The second required learning journal assignment for today, J157B, is as follows. On your learning journal page record the answers to these four questions: a. The hydrogen ion concentrations in aqueous solutions of acids and bases can vary from about 1 M to 0.000 000 000 000 010 M. Expressing small numbers can more compactly be accomplished by using power of ten notation.
a. What is the advantage of using logarithms to express powers of ten? Please make your response longer than one sentence.
b. According to Figure 19.12 on page 602, what is the color change interval and end point color of the indicator known as bromothymol blue? Please make your response longer than one sentence.
c. According to Figure 19.12 on page 602, what is the color change interval and end point color of the indicator known as methyl red? Please make your response longer than one sentence.
d. According to Figure 19.12 on page 602, what is the color change interval and end point color of the indicator known as phenolphthalein? Please make your response longer than one sentence.
2.a. Use the PQ5R or SQ5R method to prepare study guide for text section 19.4 on Neutralization Reactions or go to https://socratic.org/chemistry to research the topics brought up in section 19.4 of your text. Read section 19.4 in your chemistry text, pages 612 through 617, 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 19.6 on page 614 which reviews howto use an equation mole ratio to calculate the number of moles of an acid needed to neutralize a given number of moles of base.
- For practice problems I19-30 (In chapter 19, problem 30), and I19-31 on page 614 write down the specific neutralization equation being referred to and show your work.
- Study Sample Problem 19.7 on page 616 which reviews howto use an equation mole ratio and the relative volumes of an acid and a base that are equivalent in neutralizing power to calculate the concentration of an acid that has been titrated with a base.
- For practice problems I19-32 (In chapter 19, problem 32), and I19-33 on page 616 write down the specific neutralization equation being referred to and show your work.
- In the Section Assessment 19.4 on page 616, read, analyze, describe and explain practice problems I19-34 (In chapter 19, problem 34), and I19-35. Do and show your work for practice problems I19-36ab, and I19-37abcd.
- For problem sequence I19-37abcd, show the correctly written formula, phase, and coefficient for each reactant and product of an acid-base neutralization reaction, and show the check for mass and charge balance for each expression.
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:
- Review those concepts that we have discussed in class that are in your study guides, that are in your text study guide at the end of the chapter, and that on the chapter vocabulary sheet provided to you that describes what is a substance, an element, a compound, a coarse mixture, a colloidal suspension, a solution; an atom; a formula unit, a molecule; a phase, an aqueous phase; a chemical change, a physical change; a chemical reaction, a reactant, a product, a word equation, and a formula unit equation. How are these concepts different? You need to be able to explain the meaning of each of these terms, and be able to differentiate the terms, be able to compare and contrast these related terms, and give examples that make clear the points that you are trying to explain. Go over each of these concepts with your study partner.
- Review the SI prefixes and their meanings until you can readily explain the meaning of each listed SI prefix as a numerical multiplier.