Chapter 1. Introduction and Review

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1 Which of the following molecules has the greatest differences in electronegativity between the two different elements? CO CS2 H2O CN- 2 Arrange the following elements in the order of increasing electronegativity (least first). N, S, Li, Si, C S, Si, Li, C, N Li, Si, S, C, N Si, C, Li, N, S Li, C, N, S, Si 3 Arrange the following componds in the order of increasing ionic character of the indicated bonds (least first). C-Cl, C-S, C-O, C-N C-Cl, C-S, C-N, C-O C-S, C-N, C-Cl, C-O C-N, C-O, C-Cl, C-S C-O, C-N, C-Cl, C-S 4 Which of the following compounds are nonpolar? H2O, CO2, NH3, BF3, CHCl3 CO2, NH3 CO2, BF3 H2O, NH3 NH3, CHCl3 5 Carbon has a formal charge in which of the following compounds and ions? CO2 CO3-2 CS2 CF3+ 6 Nitrogen has a negative formal charge in which of the following compounds? NaNH2 N2 NH4Cl HCN 7 What is the molecular geometry (shape) of NO2+ ? Tetrahedral Linear Trigonal Pyramid 8 What is the molecular geometry (shape) of CH3- ? Tetrahedral Linear Trigonal Pyramid 9 How many constitutional isomers are there for an alcohol having the molecular fomular of C4H9OH? 2 3 4 5 10 Which of the following deos not belong in the group of constitutional isomers?