Enter your Name:   Enter your E-mail Address:  01. How many oxygen atoms are in an Al2(CO3)3 molecule? 02. Polyatomic ions are often said to be a cross between covalent molecules and ionic molecules. Why can they be characterized in such a way? 03a. Give the chemical formula for calcium acetate 03b. Give the chemical formula for barium chromate 03c. Give the chemical formula for ammonium carbonate 04. Give the balanced chemical equation for the reaction that occurs when aqueous ammonium chloride reacts with aqueous barium nitrate to produce solid barium chloride and aqueous ammonium nitrate. 05. In VSEPR theory, which repels other electron groups more bly, a bond or a non-bonding electron pair? 06. Explain, in your own words, why molecules sometimes attain three-dimensional shapes rather than just being flat. 07. Determine the shape of an I2 molecule. Give its bond angles and draw a picture of it. 08. Determine the shape of a NHF2 molecule. Give its bond angles and draw a picture of it. 09. Determine the shape of a CHI2Cl molecule. Give its bond angles and draw a picture of it. 10. Determine the shape of an I2O molecule. Give its bond angles and draw a picture of it. 11. Determine the shape of an SiS2 molecule. Give its bond angles and draw a picture of it. 12a. Classify NHF2 ionic, polar covalent, or purely covalent. 12b. Classify CHI2Cl as ionic, polar covalent, or purely covalent. 12c. Classify I2O as ionic, polar covalent, or purely covalent. 12d. Classify SiS2 as ionic, polar covalent, or purely covalent. 12e. Classify KNO3 as ionic, polar covalent, or purely covalent. 12f. Classify CF4 as ionic, polar covalent, or purely covalent. 12g. Classify I2 as ionic, polar covalent, or purely covalent. 13a. If you have ever poured gasoline on your hands, you know that washing with soap and water doesn't get the gasoline smell off of your hands very well. Why? 14a. What common household product might you wash your hands with to better remove the gasoline smell from your hands?