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Hmwk2 - Chem 2070 Homework#2 1 Balance the following...

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Chem 2070 Fall 2011 Homework #2 Due September 9 1. Balance the following reactions: P 4 + Cl 2 PCl 3 P 2 H 4 PH 3 + P 4 Cl 2 O 7 + H 2 O HClO 4 FeCl 3 + H 2 S Fe 2 S 3 + HCl C 7 H 14 + O 2 CO 2 + H 2 O KClO 3 + C 12 H 22 O 11 CO 2 + H 2 O + KCl 2. A hydrocarbon of formula C x H y is burned in oxygen and one mole produces 3 moles of carbon dioxide and three moles of water. Find x and y . 3. Do problem 3-11 from our text. 4. Do problem 3-17 from our text. 5. Do problem 3-33 from our text. 6. The work function of a metal is the energy required to release an electron, as in the photoelectric experiment. Work functions for a number of metals are provided below in the table. Metal Cs Rb Na Ca Li Mg Al Work Function (aJ) 0.34 0.36 0.38 0.46 0.47 0.59 0.68 How do the work functions vary (a) Down a column; (b) Across a row; (c) Estimate the work function for potassium, K; (d) What periodic property would you expect the work function to behave most like? 7. Our text mentions how Mendeleev predicted the properties of Gallium before it had been
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