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The Panama Puzzle The name's Reed. Walter Reed: Major, US Army Medical Corps.

The Panama Puzzle The name's Reed. Walter Reed: Major, US Army Medical Corps.

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The Panama Puzzle The name's Reed. Walter Reed: Major, US Army Medical Corps.

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  1. The Panama Puzzle The name's Reed. Walter Reed: Major, US Army Medical Corps. I need your help. It's June 25th, 1900, and I've just been posted to Cuba after the end of the Spanish-American war. We lost more men to disease than bullets in that campaign. One disease in particular. In Panama, our boys have started digging a canal so that our warships can get from the Atlantic to the Pacific. Some canal! We've got big trouble - hundreds of our men have died so far from this maddening disease. We call it "yellow jack" (yellow fever). They get a high fever and jaundice. Up to half of those who show symptoms die. It's my responsibility to find out what's causing it and put a stop to it. Like I said, I need your help. The surgeon general has put three assistant surgeons under my command: James Carroll, Jesse W. Lazear and Aristides Agaramonte. We've got a few ideas so far about what could be causing the disease: The hot, humid air the men have to breathe A disease spread by rats A disease spread by mosquitos A disease spread by drinking water A disease caused by germs (bacteria) What do you think?

  2. The Particle Theory Ch. 2 pages 44 to 47

  3. Assignment • Read pages 44, 45,46 and 47 • Write definitions of bolded words in your notebook. • Copy over: Table 1 page 44 Figure 1 page 45 Table 2 page 46

  4. The Particle Theory More than 2000 years ago, a Greek philosopher Democritus suggested that matter was made of tiny particles too small to be seen. He thought if you kept cutting a substance into smaller and smaller pieces, you would find the building blocks of matter.

  5. 4 Principles of the Particle Theory • All matter is made of tiny particles. • All particles of one substance are the same. - Different substances are made of different particles. • The particles are always moving. - The more energy the particles have, the faster they move. • There are attractive forces between particles. - These forces are stronger when the particles are closer together.

  6. Molecules and Atoms and the periodic table http://www.youtube.com/watch?v=sxvEOVOFB8k

  7. Vocabulary (with an example of each) Pure Substance Mixture Heterogeneous mixture Solution Elements Compounds

  8. Vocabulary Pure Substance – contains only one kind of particle. For example Mixture – contains at least two different pure substances or two particles Heterogeneous mixture – If the particles don’t mix well together, like granola, where you can see the different parts. Solution – may be made up of liquids, solids, or gases. Air is solution of gases, alloys are solutions of metals. The parts mix well together so you can not see the different parts. Elements – pure substances that can not be broken down into simpler substances. These elements are on the periodic table. Compounds – are pure substances that contain two or more different elements in a fixed proportion. They are formed when elements combine to form a chemical reaction.

  9. Vocabulary (with an example of each) Atoms Molecules

  10. Vocabulary (with an example of each) Atoms – can also be termed element. The periodic table is the collection of elements. Molecules – atoms join together in combinations to make molecules. Molecules can contain thousands of atoms. Water is hydrogen and oxygen and air is oxygen. Atoms and Molecules/Mass etc. http://www.youtube.com/watch?v=GyA38vUV2BQ

  11. Group Project In groups of 4 (two girls, two boys) prepare a presentation of the vocabulary words from pages 44 to 47. Be prepared to present your unique presentation to the class. Use your imagination!

  12. Metals and Non-metals Page 50 – 51

  13. Chemical Symbols and Formulas Page 58 – 59 A chemical symbol is an abbreviation of the name of an element (periodic table). A chemical formula is the combination of symbols that represents a particular compound. The chemical formula indicates which elements are present in the compound and in each proportion. The chemical formulas are made from periodic table elements.

  14. Chemical Formulas Each chemical symbol in a formula represents an element. If only one atom of an element is present in a compound, no number is included. If there is more than one atom of that element in the compound, the symbol is followed by a number written below the line. The number is called a subscript. H2O = two hydrogen, one oxygen NaHCO3 =

  15. Try this 1. What are the symbols for the following elements: a) calcium b) iron c) chlorine d) phosphorus e) copper 2. Write a chemical formula for the following: a) a molecule of hydrogen gas that is made up of two atoms of hydrogen. b) a molecule of propane gas that is made up of three atoms of carbon and eight atoms of hydrogen. 3. Turn to page 59, copy table 2 in your notebook and answer question 4.

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