lect5prt - When elements react their atoms combine in A...

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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
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Dalton assigned carbon an atomic weight of 6. He also assumed that the simplest binary compound of carbon and hydrogen had one atom of each in it. We know that carbon atoms weigh 12 times as much as hydrogen atoms. Which gas that we know today did Dalton use as his representative of the simplest binary compound of carbon and hydrogen? A. Methane (CH 4 ) B. Ethane (C 2 H 6 ) C. Ethylene (C 2 H 4 ) D. Acetylene ( C 2 H 2 ) E. Benzene ( C 6 H 6 )
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Charles-Augustin de Coulomb 1736-1806 Coulomb’s Law: There exists a property we call charge. Like charges repel. Unlike charges attract.
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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”
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Sir Humphrey Davy Demonstrating the effects of
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Unformatted text preview: 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. André-Marie Ampère 1775-1836 Hans-Christian Ørsted 1777-1851 “He has no manners, he is awkward, shy and presents himself badly.” Spoken by his future wife…. Demonstrated the intimate connection of magnetism and electricity Michael Faraday. Began as Davy’s assistant. His electrolysis globe. Electrolysis “reverses” chemical reactions. One of Faraday’s long-lasting contributions to science and technology. C athode R ay T ube Circa 1935 J J Thomson Cathode ray inseparable from the negative charge. Negative charge has mass about 1/2000 th of the atom. ATOMS are DIVISIBLE Thomson’s Plum Pudding Model of the Atom Positively charged bulk Negatively charged electrons How small is the atom? What is the mass of (anything)? Very small....
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  • Fall '07
  • ZAX,D
  • Atom, Electron, Electric charge, Sir Humphrey Davy, simplest binary compound

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