by horse Comment Closed

LARN 069 C18D1

Study for the summative assessment on chapter 8 on Covalent Bonding that is to be given on your next school day that our class meets.  Today is day 69.  Study for your test which is scheduled for school day 70!  If your class does not meet on day 70, today’s home learning activities are listed under day 70 and on day 70 your home learning activities are those listed below.

Start the following in class:

1. Go to http://www.phschool.com/webcodes10/index.cfm?wcprefix=cda&wcsuffix=1080&area=view  and take an online formative assessment for chapter 8, Covalent Bonding.  Then click on the Score My Test button and study anything that you do not yet understand.

2. 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 J69 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 topic J69 for today is:

a. What does the presence of a weak attraction of a substance such as oxygen towards a strong magnet tell us about the arrangement of electrons within the substances molecules?

b. What is this phenomenon of a weak attraction of a substance such as oxygen towards a strong magnet called?  [Hint: Do not confuse this property with the weak attraction of polar molecules situated between electrically charged plates.]

3.  Study for your chapter 8 summative assessment on covalent bonding.  

a.  Be able to:

  1. Write the outer electronic configuration both for single atoms and for monatomic ions of elements in groups 1, 2, 13, 14, 15, 16, 17, or 18.
  2. Apply the rule for finding the total number of valence electrons for given neutral or charged atoms using the periodic table.
  3. Use TE, VE, SE, and NBE arithmetic calculations to help you to rapidly and correctly write dash/dot formulas for molecules of substances.
  4. Describe what bond dissociation energy is and be able to use the concept of bond dissociation energy to solve chemistry problems.
  5. Describe the differences between single, double, and triple bonds, and distinguish how many sigma or pi bonds are involved in single, double, and triple bonds.
  6. State which nonmetals occur as diatomic molecules [H2(g), N2(g), O2(g), F2(g), Cl2(g), Br2(l), I2(s)] and be able to describe the bonding within these molecules and to write dash/dot formulas for single molecules of those substances.
  7. Describe what an electron group is and understand the relationship between the number of electron groups surrounding the kernel of a nonmetal and the approximate measure in degrees of the resulting bond angles.
  8. State the geometric name given to arrangements of atoms (nuclei) that are tetrahedral pyramidal, trigonal pyramidal, trigonal pyramidal, bent, or linear.
  9. State the approximate values of various bond angles associated with tetrahedral pyramidal, trigonal pyramidal, trigonal pyramidal, bent, and linear molecular geometries.
  10. Describe specific bonds between two covalently bonded atoms as being either a sigma or a pi bond.
  11. Describe the kind of hybrid atomic orbitals (sp, sp2, or sp3) in the valence shell of a central bonded atom based on the total number of bonding and nonbonding electron groups surrounding that central atom.
  12. Classify bonds as nonpolar covalent, polar covalent, and ionic based on the electronegativities of the two atoms participating in the bond and the presence or absence of symmetry in the way any bond polarities are oriented.
  13. Describe the conditions for which polar bonds within molecules might or might not make the entire molecule a dipole.
  14. Classify molecules as polar molecules if they contain one or more polar bonds which do not cancel out, or as nonpolar molecules if they contain either no polar bonds or polar bonds of equal magnitude which symmetrically cancel out.
  15. Describe examples that clarify the meaning of the solubility rules that “like dissolves like” (substances having formula units of like polarities dissolve substances of similar polarity) and that “unlikes tend not to dissolve in each other”.

b.  Review and study your notes, and your journal reflections. Study the Cornell notes that you took in and out of class.  Review anything that you previously corrected on the Chapter 8 Study Guides, Chapter 8 Section Reviews, Chapter 8 Covalent Bonding [Formative] Test A, and other work sheets which you have checked using green ink.  Look up anything that you still don’t understand in your text, glossary, vocabulary study sheets, class notes, or come to help class if you need help.

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

1.  Review the sixteen properties of metals, ionic compounds, covalent network solids, and covalent molecular compounds listed on the Properties to be understood worksheet.

  • Review how the typical properties of members of these classes of compounds depend on whether the compound has localized or delocalized electrons, and upon whether strong metallic, ionic, or covalent bonding or weak van der Waals forces of attraction are predominant between representative particles of the substances.
  • Relate each property of a given covalent molecular substance to the groups of covalently bonded atoms that form molecules whose van der Waals attractive forces only weakly attract other molecules.
  • In your Learning Log record any question(s) you would want to ask your teacher in class about the above mentioned properties.

2. In preparation for your summative assessment, review and reinforce your command over certain important concepts.

  1. Review the meanings of the words on the chapter 1, chapter 2, chapter 3, chapter 4, chapter 5, chapter 6, chapter 7, and chapter 8 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. Check out the student made Quizlet for chapter 8 at https://quizlet.com/176002648/ch-8-covalent-bonding-flash-cards/
    ionic-metallic- bonding-flash- cards/    .  Do all the definitions reflect a thorough and correct understanding?
  3. Study the Key Concepts given on pages 33, 57, 95, 121, 148, 180, 206, and 246 of the text.
  4. Study the SI prefixes and their mathematical meanings until you can readily explain the meaning of each listed SI prefix as a numerical multiplier. Go over each of these concepts with your study partner.
  5. Review the concepts of substance, element, atom, compound, formula unit, phase, coarse mixture, colloidal suspension, solution, aqueous phase, chemical change [as different from a physical change], chemical reaction, reactant, product, word equation, and formula unit equation. Go over each of these concepts with your study partner.