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LARN 162 C41D2

Start the following in class:

Log onto your MNSD Honors Chemistry Google Classroom.  Take the two formative assessments labeled: 

  1. QUIZ on SI Prefixes
  2. Cycle 41 Day 2:   Steps to Construct a Unit Conversion Ratios Setup and then to Check it.

1. Write your journal entry on sheets of three holed 8.5 inch by 11 inch ruled paper in your Journal notebook. In the upper right corner white space of each upward facing page, write your hand in number within a circle followed by your name. 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.  Rather than just to find answers to questions, the goal of journaling is to reflect on, synthesize, and clearly express your thoughts in statements of your own understanding, so do not paraphrase material from other sources that you do not understand.

Answer the following questions, J162abc, in your Journal Notebook.

a. To check the setup to a chemistry problem that has been solved with dimensional and unit analysis, what must be checked for on the left side of the equation?

b. To check the setup to a chemistry problem that has been solved with dimensional and unit analysis, what three (3) things must be checked for on the right side of the equation?

c. To check the response or answer to a chemistry problem that has been solved with dimensional and unit analysis, what three (3) things must be checked for in the answer?

2.   Review how to show dimensional analysis setups for problem solving as given on the handouts entitled Unit Analysis Strategy and Unit Analysis Step by Step Guidance .

a. Thoroughly study the last page of the Unit Analysis Strategy  document so as to be able to properly check each problem.  As a help to review and to clearly show examples of what is required for top level evaluation of this assignment, a few of the problems have been worked through step by step using the flipchart entitled Dimensional and Unit Analysis.

b. In your Learning Log use blue or black ink to place your hand in number in a circle followed by your name in the upper right white space of new page in your spiral bound notebook.

  • Centered on the first blue line, write the title for the learning activity:  Showing Setups for Dimensional Analysis Problems.
  • Show the solution to the ten (10) problems listed below using the method of dimensional analysis/unit analysis.
    • Place the page number to the left of the red marginal line starting on the third blue line.  Underneath the page number write the date, and underneath the date, the problem number for each problem just before solving it.
    • Write your problem setups and answer in ink to the right of the marginal line in accord with the instructions given on the handouts listed in number 2 above.
    1. text page 82, I3-29
    2. text page 85, I3-34
    3. text page 85, I3-35
    4. text page 86, I3-36
    5. text page 86, I3-37
    6. text page 87, I3-43
    7. text page 87, I3-45
    8. text page 93, I3-48b
    9. On page three (3) of the handout entitled Unit Analysis Strategy, do formative assessment problem #1 or FA#1:

What mass of hydrogen gas, H2(g), in grams is produced when 5.97 g of zinc, Zn(s) completely react with 6.00 M HCl(aq)?

  1 Zn(s) + 2 HCl(aq) → 1 ZnCl2(aq) + 1 H2(g)

   5.97 g                                                           ? g

                      ? g = 

 

              10. On page three (3) of the handout entitled Unit Analysis Strategy, do formative                                     assessment problem #2 or FA#2:

When 5.97 g of zinc, Zn(s), completely react with 6.00 M HCl(aq) and produce 31.9 L of hydrogen gas, H2(g), what volume of 6.00 M HCl(aq) solution in liters is used up?   Recall that the symbolism 1.00 M HCl(aq) means 1.00 moles of HCl(aq) ·(1 L of solution)-1.  The -1 exponent on the unit of measure means that this unit is in the denominator of a fraction whose numerator is the quantity by which it is being multiplied.

1 Zn(s) + 2 HCl(aq)     →     1 ZnCl2(aq)    +    1 H2(g)

5.97 g      ? L HCl(aq)

                          ? L HCl(aq) =