R03-A - 2 O 2 1s 2 2s 2 2p 6 Na 1s 2 2s 2 2p 6 Na Al 3 1s 2...

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CHEM 111 Recitation Week 6 Name: Answer Key February 26 th & 28 th , 2008 (10 points) Section: 1a. What is the general rule for determining whether a compound is ionic or covalent? (0.5 points) Ionic: between metals and nonmetals Covalent: between nonmetals and nonmetals 1b. Label each substance as an element, ionic compound, or covalent compound. (1 point) H 2 : element NaCl : ionic AgCl : ionic SO 2 : covalent CH 4 : covalent F 2 : element 2. Write the chemical formula for the product that will form when the following pairs of elements react. (2 points) Ba and F BaF 2 iron(II) and oxygen FeO K and Br KBr aluminum and oxygen Al 2 O 3 3. Indicate either the electron configuration or the charge of the given species. Label each as either diamagnetic (having no unpaired electrons) or paramagnetic (having unpaired electrons). (2 points) All are diamagnetic Ca: 1s 2 2s 2 2p 6 3s
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Unformatted text preview: 2+ O 2-: 1s 2 2s 2 2p 6 Na: 1s 2 2s 2 2p 6 Na + Al 3+ : 1s 2 2s 2 2p 6 4. Rank the species in #3 in order from largest to smallest: (1 point) O 2-> Na + > Ca 2+ > Al 3+ See figure 8.29 on page 320 in your book for more info. 5. Fill in the blanks with the appropriate number (0.5 points) 5 Total number of atoms in one molecule of CH 4 12 Number of oxygen atoms in one formula unit of Pb 4 SO 4 (CO 3 ) 2 (OH) 2 3 Number of sulfate ions in one formula unit of Fe 2 (SO 4 ) 3 6. Of the compounds below, which contain ionic bonds, which contain covalent bonds, and which contain both ionic and covalent bonds? (1 point) a. CoCl 2 ionic b. PCl 5 covalent c. LiF ionic d. CaCO 3 both 7. Draw the Lewis structure for each substance below. (2 points) HF N 2 NaCl H 2 O H F N N Na Cl H O H NH 4 + CH 3 OH N H H H H C O H H H H...
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