14 October Science 8 Catching up–How to determine a complete reaction

Several things to do today:

  1. Clean up bottle experiments. You may test the gas as demonstrated 2 classes ago. Conditions: Only one basin and one test at one table at a time. When you are ready to test, call me (Dr. F) to your table and explain the planned procedure. Remember all safety precautions.
  2. If you do not want to test the gases, just clean up the bottles. Take off the tape label.  Empty the contents–liquid down the sink; solids in the dust bin. No solid material in the sink, please. Rinse the bottles and place them in the box upside down. Put the lids in the designated container.
  3. If you have not done so, enter your data in the spreadsheet for the mass of the vinegar and baking soda reaction in a closed container. https://docs.google.com/a/aes.ac.in/spreadsheets/d/1hWjsbOp17SJ8QmKZPCLgmAi789UvalbGIkjqqo2FNXI/edit?usp=sharing
  4. Today / Tonight view the moon. Check out the view for 14 October: https://www.timeanddate.com/moon/india/new-delhi

Begin keeping a moon journal. Make a sub-folder in  your astronomy folder. For each observation:

  • date
  • time
  • location (describe as precisely as you can
  • direction you are looking along the horizon (bearing or azimuth)
  • angle of elevation above the horizon
  • appearance–phase, orientation (photo if you have a good camera, sketch; if you have binoculars, look at the moon and notice the appearance of the surface; it is very interesting to look right at the edge of the illuminated portion; what do you see?)

5. Be sure you have answered the homework questions:


  • What does the author mean, “we all practice chemistry without being aware of it?” Please include specific examples to support your answer. Refer to a paper from the beginning of our unit Fundamental-questions-about-matter.
  • What part did craft knowledge play in the development of chemistry, according to the author? Use specific examples.
  • What were the dreams of “alchemy?”
  • What are some of the “ironies” in the history of chemistry? Look at the stories of various substances to see where they started and the surprising place they ended.
  • What is meant by “tapirage?” Why is this example included in the article?
  • What is the role of the balloon in the development of chemistry? What is significant about a balloon in studying matter?
  • How did ideas about elements change from those of the ancient Greeks to those of scientists who followed Mendeleev?
  • Pick one of the pictures and write a detailed analysis of it.

6. Bring your observations–evidence/argument–atomic-molecular theory chart up-to-date. Show me (Dr. F). Matter chart (this should be updated with each matter experiment and activity matter-chart or


7. In a new group of 3. Discuss how you would address this question/problem: What is the proportion of vinegar and baking soda that will completely react with each other so that no vinegar is left over and no baking soda is left over. What can you do to see that neither of the reacts remains after a reaction? Remember that in a chemical reaction, the molecules of the reactants are rearranged to make new molecules. (The total number of atoms remains unchanged.) If the reaction is complete, there are no more of the original molecules. When you have an idea, discuss with me (Dr. F.). If you have 5 grams of baking soda, how much vinegar is needed so that all the 5 grams of baking soda reacts and all of the acetic acid in the vinegar reacts? That means there is no more baking soda and no more vinegar. How much gas (in grams) is produced from these portions?

8. Bring your digital science notebook up-to-date.

  • An entry for every class. Each entry includes:
  • Notes you would normally take.
  • Sentences about what you did
  • Sentences about what you saw
  • Sentences about what you and others talked about
  • Sentences about your ideas, questions, wonderings, reflections
  • A photo of something important from the class that helps you think and remember
  • A sketch of something important from the class that helps you think and remember–the sketch can be of an idea, it does not have to be of an object.

Show and tell of DSN soon.


About rfrazier

AES profile = http://aes.ac.in/viewprofile.php?u=6946
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