lect4prt - The English Minister John Dalton Law of Multiple...

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The English Minister John Dalton Law of Multiple Proportions Some elements combine to form different compounds. When they do, the ratio of masses of the two elements are always found to be small integer. His conclusion: Compounds must be made of fundamental units which he called atoms. The building blocks are manipulable only according to a fixed set of rules.
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John Dalton’s Atoms:
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A. Hydrogen and chlorine atoms aren't created or destroyed in the process so the reactant mass is the same as the product mass. B. Chlorine accepts hydrogen's electron to form polar covalent hydrogen chloride C. One atom of hydrogen combines with 35.453 atoms of chlorine in this reaction D. Hydrogen and chlorine atoms always combine in a 1:35 ratio. E. This is a simple mixture of elements because the ratio isn't a whole number ratio 1.008 grams of hydrogen combines with 35.453 g of chlorine to form 36.461 g of a pure compound (hydrogen chloride). Dalton's
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Unformatted text preview: form 36.461 g of a pure compound (hydrogen chloride). Dalton's explanation for this experimental fact might be: When elements react, their atoms combine in: A. Arbitrary proportions B. A simple whole number ratio (unique for each pair of elements) C. Simple whole number ratios (more than one possible) D. 1:1 ratios E. Pairs Count Alessandro Volta His battery, composed of pairs of copper and zinc disks separated by rags/conductive solutions. With more than 20 cells in series, “it caused considerable pain” Sir Humphrey Davy Demonstrating the effects of laughing gas at a public lecture No lab is complete without the necessary safety equipment. Davy needed one. But one day he forgot. And was blinded (temporarily) by an unexpected explosion. Michael Faraday. Began as Davy’s assistant. His electrolysis globe. Electrolysis “reverses” chemical reactions....
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  • Fall '07
  • ZAX,D
  • Michael Faraday, John Dalton, Hydrogen chloride, Humphry Davy

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