LARN 100 C25D4

Start the following in class:

1.  To the left of the marginal line, print J100A 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  paragraph with a topic sentence, follow with explained instances, and close with a focused summary statement.

The required journal focus topic, J100A, for today is

a. In chemistry, all problems involving the prediction of the chemical amount of a reactant used up or of a product require the use of an equation mole conversion ratio (also known as a stoichiometric ratio).  When the equation mole ratio is set up, what will the units of the numerator of the equation mole ratio be, and what will be the units of its denominator?

b.  In a paragraph of several sentences, describe a problem solving strategy that uses conversion factors as a means of solving problems involving the prediction of the chemical amount of a reactant used up or of a product produced, as indicated by a chemical equation.  

Refer to the handout on how to use dimensional analysis and Figure 12.8 on the top of page 363 in your textbook if you need additional help.

2. The second required journal focus topic, J100B, for today is limiting and excess reagents.

A reagent is a pure substance that is to be used as a reactant in a chemical reaction.

  1. Compare the terms limiting reagent and excess reagent in terms of whether these substances present before the reaction are still present after the reaction.
  2. Explain why the amount of product produced in a chemical reaction depends on the amount of limiting reagent present before the reaction.
  3. Describe whether both reactants can ever both be limiting reagents.
  4. Explain the reasoning that justifies your conclusion about whether both reactants can ever both be limiting reagents.

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

4. Log onto Google Classroom and follow the instructions for LARN 100 C25D4 on Principles of Problem Solving Using Unit Conversion Ratios.

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

1. Study the handout on some of the conversion factors that are used in chemistry.

  • Learn the first seven named conversion factors, what ratios are represented by the names, and the units of the conversion factors.
  • Then from memory as a formative assessment, answer the following focus questions.
  1. 1a to 7 a.  What seven named conversion factors (used in the text and in class and listed on your handouts) can be used with dimensional analysis to quickly solve most stoichiometric problems?
  2.  1b to 7b.  Describe the units of the numerator and denominator of each ratio.
  3.  1c to 7c.  Describe how each conversion factor is obtained. [Hint: Some conversion factors are fixed ratios, but others depend on the substance or the chemical reaction and need to be looked up or calculated in specific ways.]

2.  In the upper right corner white space of each upward facing page of your Journal notebook, 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 J100B 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.
  • The required journal focus topic, J100B, for today is to construct a diagram as follows.

           Study Figure 12.3 on page 357 in your text and carefully construct a similar diagram with just five (5) rows.

Record the balanced chemical expression in row 1 of your diagram.

Carefully draw in space filling representations for each of the molecules in row 2 of your diagram immediately below each reactant and product formula unit represented in the equation in row 1 as shown in Figure 12.3.

Similarly draw in original row 4 from Figure 12.3 concerning molecules as row 3.

Similarly draw in original row 7 from Figure 12.3 concerning amounts of substances as row 4.

Similarly draw in original row 10 from Figure 12.3 about volumes of gases at standard temperature (0.00 °C) and pressure (101.325 kPa) as row 5, but reduce all coefficients so that they are prime relative to one another.

3. 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.   Consider each learning objective as you proceed through the chapter with the aim of being able to demonstrate your understanding and ability to apply the learnings.  For now, study and take Cornell notes on objectives 3, 4, 5 and 9.  

4.   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.