by horse Comment Closed

LARN 063 C16D3

Start the following in class:

1. In your Journal Notebook write your journal entry on sheets of three holed 8.5 inch by 11 inch ruled paper.  In the upper right corner white space of each upward facing page, use a blue or black pen to write your hand in number within a circle followed by your name.  To the left of the marginal line, print J63 and circle it. 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.  The required journal focus activity J63 for today is

Compare single, double, and triple covalent bonds in a table with the following five column headings:

Type of Bond Dot Symbol for the Bond Dash Symbol for the Bond Relative Strength of the Bond

[1, 2, or 3  as Strongest]

 Relative Reactivity of the Bond

[1, 2, or 3 as most reactive]
1 Single Covalent Bond
2 Double Covalent Bond
3 Triple Covalent Bond

2. Doing ChemThink interactives are part of the core experiences for all chemistry students.

  • Log onto the ChemThink web site http://simbucket.com/chemthinkserver/chemthink/ to do the tutorial and question set on Ionic Bonding.
  • Choose menu the selections:  Molecular Shapes  > Go to the Tutorial.  [If you are logged onto the ChemThink web site, you do this by clicking on the green triangle in the white circle to the right of the displayed module’s name. If you were taken directly to a web page with an orange Tutorial button and a blue Problem Set button, click on the orange Tutorial button.]
  • If you do not have a copy of the worksheet that goes with this module, click on the provided link to the ChemThink worksheet for this module or, if that doesn’t work, locate it in the Student Resources > Handouts > ChemThink Formative Assessment Note Sheets folder. Download the worksheet, and print off a copy.
  • Place your hand in number and name in ink in the upper right corner of the worksheet.
  • Now work your way through the online tutorial.  You will have to answer each problem correctly to advance to the following page. FYI: When there are check boxes given before possible correct responses in either the tutorial or the problem set, more than one response may be correct, so carefully consider each response before submitting your answers.
  • Record a response to each question asked on the worksheet.
  • Then choose the menu selections:   Molecular Shapes  > Go to the Problems to formatively assess the understanding that you have built up by doing the Tutorial.  Try to do each problem in the Problem Set correctly during your first attempt at working your way through the problem set.  If you get a problem wrong, focus on understanding why each problem in the question set is answered in the way that it is.   Your goal is eventually to have a deep enough understanding to score 10 out of 10. If you did not attain that level of understanding the first time through, review some more, and do the problem set again until you have mastered the content with a 10 out of 10 score.
  • Place the worksheet in the Notes section of your 3 ring binder and bring it to class.

Diagramfix:

If your Chrome browser displays the questions but not the diagrams for a ChemThink assignment, it is because Chrome needs to be updated to a version that supports the webgl 2.0 standard.  Actions you can do to try to get the diagrams displaying:

  1. Clear the Chrome cache:
    1. Hold down CTRL+SHIFT+DELETE
    2. Enter All time
    3. Check all boxes
    4. Click on Delete
    5. Close the Chrome browser
    6. Open the Chrome browser and go to and log on to the ChemThink website
  2. If that doesn’t work:
    1. Enter Chrome://flags in the address bar
    2. Search for webgl
    3. Enable Webgl 2.0 compute
    4. Click Relaunch at the lower right.
    5. Go to and log on to the ChemThink website

3. Reread section 8.2 on the Nature of Covalent Bonding in your chemistry text, pages 226 through 229, and reflect on the points that you recorded in your Learning Log study guide for that section. Review the chapter 8 vocabulary as you think about the meanings of the terms and add any notations to the vocabulary list for clarifications sake.

  • Study Conceptual Problem 8.2 on page 225 and then show your TE, VE, SE, NBE work for practice problems I8-9, and I8-10.
  • In the Section Assessment 8.2 on page 229 read and analyze review questions I8-13, I8-14, I8-15, I8-16, I8-20, and show your TE, VE, SE, NBE work for practice problem I8-21abc.
  • Study Conceptual Problem 8.2 on page 225 and then show your TE, VE, SE, NBE work for practice problems I8-11ab, and I8-12  on p.225, and for I8-12 on p.229.
  • In the Section Assessment 8.2 on page 229, read, analyze, and do practice problems I8-17, I8-18, I8-19, and show your work for I8-22. 
  • After you are finished, check page R88 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.  Some questions do not have a suggested response given.  For each such question, circle the number of the question in the margin of your notebook paper 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. Construct dot formulas and dot/dash formulas for the first nine models in the packet of papers distributed for laboratory model building activity U05-5 (a.k.a. A28LA) entitled Three Dimensional Models of Covalent Molecules.  Use the total number of noble gas tendency electrons (TE), total number of valence electrons (VE), calculated number of shared electrons (bonding electrons) (SE), and calculated total number of nonbonding electrons (NBE) method of constructing dot formulas that was taught in class and is also explained on the handout entitled Guidelines for Drawing Lewis Structures for Covalently Bonded Atoms.

Using blue or black ink write in small print in the column on the left and show your calculation of the total number of tendency electrons, TE, your calculation of the total  number of valence electrons,VE, the calculated number of shared electrons, SE, and the calculated number of non-bonding electrons, NBE, for a molecule of each substance. Then use the calculated quantities and with a pencil draw a small dot formula for a molecule of each substance in the column on the right. The dot formula needs to be small to fit neatly into the rather small box provided.

Again use blue or black ink to construct the structural dot/dash formula for a molecule of each substance in the column titled Structural Dot/Dash Formula.

Note: The atom chain for dot and dash/dot formulas of H2O2 is H-O-O-H and should be drawn with a bent-bent structure.