HW05-key - Chemistry 111 Homework #5 Due: October 5, 2005...

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Chemistry 111 Homework #5 Due: October 5, 2005 (Wednesday) 1. Would you consider a “bond” formed between Ca and Cl to be predominantly covalent or predominantly ionic? Your answer in blackboard should be either covalent or ionic. Although technically we have to think more about this, I am satisfied for the moment if you consider that a metal and a non-metal tend to form predominantly ionic bonds. 2. Although both of these bonds are considered to be covalent, which would you consider to have a higher ionic character and why: H-F or H-Br ? Your answer in blackboard should be either HF or HBr. I would base this on the difference in electronegativity. Fluorine is the most electronegative atom in the periodic table, so there is a larger difference in electronegativity between the H and the F. This molecule is said to be more polar, or to have a larger ionic character. Answer: HF . 3. Which of these two bonds would have a larger dipole moment: H-Cl or H-S ? Answer should be either HCl or HS. This is completely analogous to the previous question. Cl is much more electronegative than S. Therefore, a bond between H and Cl would be more polarized. Answer: HCl . 4. Which atom would be considered to be the one carrying a slightly negative charge in a bond between C and N? The most electronegative. Answer: N . 5. Which atom carries a slight positive charge ( δ +) in the F-F bond? Your answer should be right F , left F or neither . Since the electronegativity difference between the two atoms is zero, there is no dipole in this molecule. Therefore, the answer is neither . For questions 6-10 , consider the structures seen below…
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Chemistry 111 2 Homework #5 / Fall 2004 Answer Key H C H H C H H C H Br H H C H H C H H C H Br H H C H H C H H C Br H H H C Br H C H H C H H H H C H H C H Br C H H H H C H H C Br H C H H H 1 2 3 4 5 6 6. What is the relationship between structures 1 and 2 ? Write the word identical or different in blackboard. We can see that the bromine is bonded to a different carbon atom in the second structure. This is certainly not the same molecule. Answer: Different . 7. What is the relationship between structures 2 and 3 ? Write the word identical or different in blackboard. These two structures are exactly the same. The only difference is that the molecule was rotated. Answer: Identical . 8. What is the relationship between structures 1 and 6 ? Write the word identical or different in blackboard. Remember that, as we mentioned in class, there is no difference between the three positions on that carbon. That is, whether the Br is on the bottom, the top, or the right, it is impossible to distinguish. This is because the molecule is NOT flat as shown and once we understand its three dimensionality, this point will be trivial. Answer: Identical . 9. What is the relationship between structures
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HW05-key - Chemistry 111 Homework #5 Due: October 5, 2005...

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