Science 8 Moon. Ganges. Chemical reactions. Oct 4-10

Moon. Ganges. Chemical reactions.

A. Our upcoming topics include Earth Cycles and Astronomy. Take a look at the moon today. Compare to the last time we looked. Use an Ipad app to examine the rising and setting times of the moon and the related phase. Predict what the moon will look like during WOW.

We have just passed the autumnal equinox. What can you find out about that celestial event? What do you notice about the rising and setting times of the sun? How can this cycle of the seasons be explained.

During the months of October, November, and January, begin making regular observations of the moon. Note phase, time of day, position in the sky (direction you look and angle above the horizon). How can these observations be explained? Keep this data in your digital science notebook–you can make a folder called Moon Journal. What does the moon appear to do during the course of a day? What does the moon do during the course of a month?

B. Our upcoming topics include Earth Cycles and Astronomy. This is an excellent documentary on the Ganges. Watch it before going on WOW. During WOW pay attention to the river. Record your observations and reflections.

There are three parts:

 

 

 

 

http://youtube.com/user/kalpavata

 

C. So far we have examined some aspects of chemical reactions in the cande in a jar investigation, the rusting of steel wool in air and water, and the effervescence of alka seltzer and water.

  1. In your notebook, list the ideas you now have about chemical reactions. Relate your ideas to the three reactions mentioned above and your results. Include reference to the handout Fundamental Questions about Matter.
  2. Today we want to continue examining the reaction of alka seltzer and water. Observe the demonstrated procedures. Make procedure notes. Accomplish the procedures and record results in the assigned groups.

a)      What happens to the temperature of a sample of water when an alka seltzer tablet is added? What are your thoughts about the result? What do you think the significance is of temperature and temperature changes when chemical reactions occur?

b)      How much gas is produced from a single alka seltzer tablet? Balloon method.

c)       How much gas is produced from a single alka seltzer tablet? Gas generator / syringe and tube method.

d)      What tests can you design to find out more about the properties of the gas produced?

3. Here is a brief description of the alka seltzer and water reaction:

Alka Seltzer contains aspirin (not a part of the effervescent reaction), citric acid, and sodium hydrogen carbonate (also called baking soda or sodium bicarbonate).

What are your thoughts about the chemical formulae and equation listed below? What do you think the symbols mean? Explain. See the diagrams of the reactants and products: Molecular models

C6H8O7 + 3NaHCO 3H2O + 3CO2 + Na3C6H5O7
See these: http://rfrazier.msblogs.aes.ac.in/2012/01/13/ball-and-stick-models-of-molecules-science-8/

and

http://rfrazier.msblogs.aes.ac.in/2012/08/25/middle-school-students-and-scientific-invention/

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