29 August Science 8 Crystals, Brownian Motion, Density, Solubility–The atomic theory of matter

On a piece of lined paper:

  • Describe density in your own words. How can the differences in the densities of water, sunflower oil, and ethanol be explained? Make a sketch of your idea.
  • What was challenging for you in determining the densities of water, sunflower oil, and ethanol?
  • What do you think happens when substances like salt and sugar dissolve in water? Make a sketch of your idea.

The results from previous class:

https://docs.google.com/a/aes.ac.in/spreadsheets/d/1AwmoUXxJDUFW67pJYNVY59jpu_TpbImx-YP2J3P5UDs/edit?usp=sharing

Crystallization

  • Make super-saturated solutions with 3 substances (see board) and hot water.
  • Let the solutions cool in petri dishes.
  • If time, silver crystals from a reaction of copper and silver nitrate.

Observe Brownian motion.

Discuss the density results. dissolving and solubility.

Relate observations to the atomic theory of matter (also called the molecular theory of matter or the kinetic-molecular theory of matter).

Use the chart below to help you organize your observations and ideas about matter:

Consider these big questions (KEEP IN VIEW-KIV QUESTIONS AND IDEAS):

  • What can we observe about the structure and behavior of matter?
  • How can we explain what we observe (at the scale of our senses) by structures, entities, and behaviors at a scale we cannot see?
  • How can such explanations be tested?
MATTER
LARGE SCALE OBSERVATIONS
LINKING EVIDENCE
ATOMIC-MOLECULAR SCALE STRUCTURES AND BEHAVIORS
DATA
ARGUMENT
THEORY

Be sure to examine the following references:

Review the document: Fundamental-questions-about-matter

Extensions for our study of matter–The Periodic Table

See the following videos–express your ideas and questions.

http://ed.ted.com/lessons/the-genius-of-mendeleev-s-periodic-table-lou-serico

Hunting the Elements

https://youtu.be/TDY59XoFSQI

World within World from the Ascent of Man by Jacob Bronowski

http://www.dailymotion.com/video/x20o2dw_bbc-ascent-of-man-10-world-within-world_tv

Elements and the economy:http://www.bbc.co.uk/programmes/p01rcrn6/episodes/guide

 

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