1 .		Which of the following orders of electronegativity is incorrect? Online Text [Hint]
2 .		How many valence electrons are shown in the Lewis structure of CN-? Online Text [Hint]
3 .		The C-O bond lengths in H2CO are shorter than would be expected for C-O single bonds. Rationalize this observation. Online Text [Hint]
4 .		Write Lewis structures for the following: (i) HOBr (ii) H2O2 (the O atoms are bonded to one another) (iii) H2CO (both H atoms are bonded to C) Pick the incorrect response below. Online Text [Hint]
5 .		What is the formal charge on the chlorine atom in the chlorite ion ClO2- and the chlorate ion ClO3-? Online Text [Hint]
6 .		Is the C-O bond in CH3OH longer or shorter than the C-O bond in CH3COCH3? Why? Online Text [Hint]
7 .		Write a single Lewis structure that satisfies the octet rule for ClO2-. What are the formal charges? Online Text [Hint]
8 .		Using Lewis structures that satisfy the octet rule, determine the number of electrons around the central S atom in SO32- and SO42-. Online Text [Hint]
9 .		Which is the best Lewis structure for COS? (Formal charges are not shown.) Online Text [Hint]
10 .		The Lewis structures of which of the following compounds obey the octet rule? (i) SO32- (ii) BH3 (iii) I3- (iv) AsF6- (v) O2- Online Text [Hint]
11 .		How many pairs of electrons are there around the central atom in the Lewis structure of ICl2-? Online Text [Hint]
12 .		Which of the following does not exhibit bond resonance? Online Text [Hint]
Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.