LARN 128 C32D4
Start the following in class:
1. When a solutes concentration is expressed in terms of molar concentration, the number of moles of solute in a given measured volume of liquid is directly proportional to the volume of the solution measured out. The required focus topic, J128, for today is
a. When the number of moles of solute in successive samples of the same solution are plotted against the increasing volumes of solution measured out, describe the shape of the graphed relationship. Give an example to clarify what you are saying and explain how your example demonstrates the concept being considered.
b. When the number of moles of solute in successive samples of the same solution are plotted against the increasing volumes of solution measured out,what does the value of the slope of the plotted line correspond to? Give an example to clarify what you are saying and explain how your example demonstrates the concept being considered.
2.a. Use the PQ5R or SQ5R method to prepare study guide for text section 16.2 on Concentrations of Solutions or go to https://socratic.org/chemistry to research the topics brought up in section 16.2 of your text. Read section 16.2 in your chemistry text, pages 480 through 486, 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 16 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. 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 [chapter #.section#] Responses. 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. Use dimensional analysis and/or the algebraic definition of molar concentration cM= nsolute / (Vsolution) to help set up the next four problems. Include the units of each measured quantity and to divide out (“cancel“) identical units that are both in a numerator and a denominator of multiplied ratios.
- Show the correct answer circled and expressed to the proper number of significant figures. Study Sample Problem 16.2 on page 481 and then show your work including all conversion ratios for practice problems I16-8 (In chapter 16, problem 8) and I16-9.
- Study Sample Problem 16.3 on page 482 and then show your work including all conversion ratios for practice problems I16-10 (In chapter 16, problem 10) and I16-11ab.
- Use dimensional analysis and/or the algebraic dilution formula cM1·Vsolution 1 = cM2·Vsolution 2 to help set up the next two problems. Be sure both to include the units of each measured quantity and to cancel all units that are both in a numerator and a denominator of multiplied ratios. Show the correct answer circled and expressed to the proper number of significant figures. Study Sample Problem 16.4 on page 484 and then show your work including all conversion ratios for practice problems I16-12 (In chapter 16, problem 12) and I16-13.
- Use dimensional analysis and/or the definitions of volume concentration [percent by volume, % v/v] = (Vsolute) ·100 / (Vsolution) and of mass concentration [percent by mass, % m/m] = (msolute) ·100 / (msolution) to help set up the next four problems citing a solutions composition by a percent concentration.Be sure both to include the units of each measured quantity and to cancel all units that are both in a numerator and a denominator of multiplied ratios. Show the correct answer circled and expressed to the proper number of significant figures. Study Sample Problem 16.5 on page 485 and then show your work including all conversion ratios for practice problems I16-14 (In chapter 16, problem 14) and I16-15.
- In the Section Assessment 16.2 on page 486, read, analyze, describe and explain practice problems I16-16 (In chapter 16, problem 16), I16-17, and I16-18, and then show your work including all conversion ratios for practice problems I16-19, I16-20; I16-21; I16-22, I16-23.
After you have written your best effort response for each assigned item, check page R96 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 as we do in 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, and chapter 16 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, and 498 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.