4 Sept. Science 8 Cooling curve; periodic table of elements; matter, elements, and atoms

Opening routine.

  1. Close devices, books, conversations, and eyes for a mindful moment. Breathe. Become calm. Focus. “The best way to capture moments is to pay attention. This is how we cultivate mindfulness. Mindfulness means being awake. It means knowing what you are doing.” ~Jon Kabat-Zinn
  2. Review DSN entry from previous class.
  3. Browse blogpost for today.
  4. Prepare new document for DSN entry for today.
  5. Questions.
  • * * * * *

Period 7 and Period 8 need to complete this. Period 5 did this during the last class:

*Learning habits response and reflection–turn in your responses by email to Dr. F <rfrazier@aes.ac.in> by the end of class. Make sure your full name and period are included. Keep a copy for your DSN.:

Respectful, Responsible, Collaborative, Perseverant

For each learning habit, reflect on your work so far this year in Science 8. The DSN is a primary piece of evidence that you are responsible and perseverant–that you are fully engaged in the class and that your engagement and effort to learn is sustained over time. You should have a collaboration document that you can refer to. To what extent do you contribute to the group’s success? To what extent are you inclusive?  To what degree to you  participate, lead, follow? Rate yourself–consistently, usually, sometimes, rarely. Cite examples. Cite specific examples. What do you think will help you develop consistently positive learning habits?

  • * * * * *

Temperature vs. Time graph of cooling and freezing a sample of water.

Work with a partner that you have not worked with before. For each discussion that you have on the items below, keep a written record of your and your partner’s comments, questions, ideas, insights, and wonderings. These notes should be written in your DSN entry for today.

Update the collaboration document in your DSN.

Share the graph you constructed of temperature curves from the freezing of water.

Use the guidelines for graphing below to check each other’s graphs.

  • a. Use pencil only. No ink or color until the graph has been reviewed and is without error.
  • b. Use any graph paper and you may orient it as you wish (portrait; landscape)
  • Graph paper available for printing: http://rfrazier.msblogs.aes.ac.in/various-resources/graph-paper/
  • c. Do not try to hand draw extra marks outside the printed graph paper.
  • d. Label axes with variable names and units first.
  • e. Examine data and find the ranges for the two variables that will be graphed. See if there are any extreme outliers.
  • f. Select a scale for each axis.
  • g. The lines on the graph will be numbered, not the spaces.
  • h. For each axis, the scale needs to accomplish several things simultaneously.
  • i. All data should be accommodated (there are exceptions for extreme outliers).
  • j. The scale factor is based on the value of one division along the axis. Thus, 1 division = some number of units. (Do not try to fix the scale by counting how many divisions = 1 unit.)
  • k. The scale should be based on numbers that are convenient and easy to use. Pick scale factors from this series: 1 division = .01, .02., .05; .1, .2, .5,; 1, 2, 5; 10, 20, 50; 100, 200, 500; etc.
  • l. The scale must be consistent across the axis.
  • m. The graphed values should take up at least 1/2 the paper (so that the graph is as large as possible).
  • n. Always include a title.

Discuss the changes in the water you observed and where they occurred on the temperature curve. Include the points of discussion in your entry for today. Give credit for each partner’s comments and questions.

What are some possible interpretations of the part of the temperature curve where the water stopped cooling and the temperature remained constant for a while before it started cooling again? (One student thought the thermometer was broken during this phase of the cooling and freezing.)

What significance is there, do you think, in the temperature plateaus (flat sections) when water is heated and when it is cooled?

Consider these claims. Do your results support them? When water is liquid, the temperature of a sample can change. When water is solid, the temperature of a sample can change. When water changes from liquid to gas, the temperature of the sample does not change. When water changes from liquid to solid the temperature of the sample does not change. We have not tried to see if water in the gas form can change temperature, but what do you think? Could water vapor change temperature? What other observations with temperature did you make during either the heating or cooling of water?

Periodic table:

Search for a periodic table app for your ipad. Find one that you like. Download it. Explore it. You and your partner may choose the same app or different ones. Share what you discover and share your questions with each other.

Examine this creative periodic table: http://vis.sciencemag.org/chemhaiku/

And this one: http://elements.wlonk.com/

And this one: https://mymodernmet.com/illustrated-periodic-table/

With your partner, make a list of questions from your examination of the periodic table in different forms?

How would you define in your own words, what an element is?

What elements do you know?

What elements have you held or touched in their pure form?

What do you think the relation is between element and compound? between atom and molecule? between pure substance and mixture?

With your partner, explore the following website. Identify your questions. What ideas are being proposed? Look at the sections on matter, atoms, elements, and the periodic table. Do not venture into chemical reactions. We will investigate those ideas later.

http://www.chem4kids.com/files/matter_intro.html

Here is an experiment to try at home with supercooled water. It looks fun. If you try it, take pictures and make notes. Let us know what happens.

https://www.scientificamerican.com/article/freeze-your-fruit-with-science/

For any partner pair that finishes the above early, begin watching together Atoms from the Ring of Truth. Take notes and questions.

 

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