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keyIII - CHEM 3510 Exam III Answer the following questions...

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CHEM 3510 Exam III Answer the following questions in the space provided, SHOW ALL WORK) 1. (5 points) Complete the following reactions: __ 1 __ CuO + __ 1 __ CO Æ Cu + CO 2 __ 1 __ Be 2 C + __ 4 __ H 2 O Æ 2 Be(OH) 2 (s) + CH 4 (g) 2. (10 points) Discuss the bonding in carbon dioxide in terms of hybridization theory. Because the central carbon atom must form two σ bonds to the oxygen atoms, we assume that sp hybrid orbitals are formed. We consider that the 2p orbitals at right angles to the sp hybrid orbitals overlap with 2p orbitals of the oxgens to provide a pair of π bonds. 3. (5 points) Draw the electron-dot and molecular structures of tin(II) chloride. 4. (10 points) Describe (using words and equations) the industrial method of the synthesis of pure aluminum. 1) Digest bauxite Al 2 O 3 + 2 (OH - ) + 3 OH - Æ 2 [Al(OH) 4 - ] 2) Acidify 2 [Al(OH) 4 - ] (aq) → + H Al 2 O 3 . 3H 2 O + 2 OH - 3) Dehydrate Al 2 O 3 . 3H 2 O → Al 2 O 3 + 3 H 2 O 4) Combine alumina with cryolite and perform electrolysis on the molten mixture 2 Al 2 O 3 /Na 3 AlF 6 + 3 C
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