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Lecture 3 - Wednesday October 21 F ig u r e 7.1 0 W h a t...

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Wednesday, October 21 CHEM 1251, Fall 2009 1 What is happening as the flames glow? A. Lighting the methanol gives it enough energy to react with the metal in the salt. The color indicates how exothermic the reaction is. (More energy released = more blue and violet wavelengths in the flame.) B. As methanol combusts, the heat excites electrons in metal ions. Light is emitted as electrons leave the ground state and jump to higher energy levels. C. Heat produced by combustion of methanol excites electrons in metal ions; light is emitted when electrons return to their ground states. D. Igniting the methanol allows the salts to burn. Some salts burn hotter than others, and the color of each flame corresponds to its temperature. CQ #1 2 Figure 7.10 3 An electronic transition from n = 2 to n = 1 is higher in energy than an electronic transition from n = 3 to n = 2. Which figure best represents this? A. The spatial picture on the left. B. The energy level diagram on the right.
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