LARN 104 C26D4

Start the following in class:

1.  Do the next equation mole ratio problem assigned on LARN 99.

2. Do the next equation mole ratio problem assigned on LARN 101.

3. To prepare for your journal entry J104A, read pages R38 and R39 on the properties and uses of the element hydrogen. In your learning journal record the answers to the questions asked below.  Please make your answers to all questions longer than one sentence.

a. What is the most interesting fact you read about?  Please make your answer to this question longer than one sentence.

b. What makes this so interesting to you? Please make your answer to this question longer than one sentence.

c. What is one fact about hydrogen that you either were not familiar with or were least familiar with?  Please make your answer to this question longer than one sentence.

4. Do all the pages in the chapter 12 Formative Test on Stoichiometry as a formative assessment to find out some of the things that you do and do not know, and not as a research project.

  • NOTE: On page 302 of the formative test for chapter 12 is a misprint.  In problem 11 the gas whose volume at STP is to be calculated is supposed to be carbon dioxide, CO2(g), not CO(g).
  • If you did not obtain a formative test for the chapter in class, go to MNSD Google Drive > Student Resources > Formative Tests and print off a copy of the test for the chapter you are studying.  Each chapter test is identified by a name whose last two digits is the chapter number.  When you open the chapter formative test the first page will have the words “Chapter Test A” in the title.
  • For each question or problem challenge, either answer the question to the best of your ability using one or more full sentences, or answer the problem to the best of your ability by recording any numbers and units together with the mathematical operations performed in symbolic terms, along with the solution to the problem which should be circled.
  • Each formative test is a real chapter test that some teachers in other schools might use as a chapter test, so after taking the test, make sure that you understand each unfamiliar word, idea, concept, and problem.  Be sure to finish this packet in its entirety.
  • After doing the formative test, but before you demonstrate your understanding on our class’ chapter test, you will check all your responses using green ink check marks √ for each correct response, and by lining out (striking trough) and inserting improved text in green ink when you think the suggested response expresses your present understanding in a better way.    In that way make sure that you understand each idea that you originally did not have a complete understanding of.  Then you will be able to study more efficiently by studying that which you corrected in green ink.

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

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 red marginal line, print J104B.
  • The required journal focus topic J104B for today is:

One way to determine which of two reacting substances is limiting is as follows.  Calculate the number of moles of each reactant actually present before the reaction, if it has not been given.  Divide the actual larger number of moles of one substance by the actual smaller number of moles of the other substance.  Compare this quotient to that obtained when the reacting equation mole ratio of the number of moles of the numerator substance is divided by the number of moles of the denominator substance.  If the actual mole ratio is less than the equation mole ratio, then the numerator substance is limiting.  If the actual mole ratio is equal to the equation mole ratio, then both reagents are limiting. If the actual mole ratio is greater than the equation mole ratio, then the numerator substance is in excess.

Explain why the method of analysis described above works to predict the limiting reagent.

2.  Download and open the Unit Learning Objectives for Cornell Notes document, press and hold the CTRL key while typing F to bring up a search (find) box.  Type in Chapter 12 in the search box and then move your cursor into the text area to the right and click there to see the first page of objectives. Study and take Cornell notes on objectives 3, 4, 5, and 9 through 13.

3.   Download current ActivInspire unit flipchart by logging on to the MNSD Google Drive and selecting it from the Student Resources > ActivInspire  folder.  Generally the flipchart name will begin with a capital U to designate the chemistry unit of study and end in a relatively high version number following the v at the end of the flipchart’s title.  Download the flipchart on stoichiometry after clicking on the following link: Stoichiometry Click through the chart quickly and take Cornell notes on concepts pertaining to the learning objectives that you are studying.  At the end of your study, write a summary statement of what you learned.

4. Study the Key Concepts given on pages 33, 57, 95, 121, 148, 180, 206, 246, 280, 314, 346, and 378 of the text.

5. 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; and 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.

6. Review the SI prefixes and their meanings until you can readily explain the meaning of each listed SI prefix as a numerical multiplier.

7. Think about the fifteen properties of covalent molecular substances listed on the Properties to be understood worksheet describing differences in the properties of metals, ionic compounds, covalent network solids, and covalent molecular compounds. Continue to study this handout for understanding and 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.Try to understand how each property of a given covalent molecular substance is related to the groups of covalently bonded atoms that form molecules whose van der Waals attractive forces only weakly attract other molecules.Be ready to ask your teacher in class specific question(s) about the one(s) that you do not understand.