AP Chemistry Review Questions Integrating Content, Inquiry and Reasoning I. Cova

Question

AP Chemistry Review Questions Integrating Content, Inquiry and Reasoning I. Covalent bonds may be classified as polar or nonpolar based on the difference in electronegativity bet ween two aloms. Look up electronegativity values in your textbook: a. Why are C-H honds considered nonpolar? b Which is more polar, an O-H or N-H bond? Explain. 2. To convert the following compounds from a solid to a liquid, what types of intermolecular forces must be overcome? b, H20(s) H20(1) C. Nal(s) Nal(l) 3. In order for a substance to conduct electricity, it must have free-moving charged particles. a. Explain the conductivity results observed for ionic compounds in the solid state and in aqueous solution. b. Would you expect molten sodium chloride to conduct electricity? Why or why not? c. Use the model of metallic bonding described in the Background section to explain why metals conduct electricity IN7654 O 2013 Flinn Scienific. Inc. All Rights Reerved. Reproduction permission is grasied oaly lo science eachers who haueie Iim Flinn Scicntific. Inc. No pant of this material may he reproduced or tranmistted in any form or hy any mcam informasive Morape and rciricval sysem, withoul permission in writing from Flinn Scieniie, Inc

Explanation / Answer

Bonds

1. Types of covalent bonds

a. C-H bonds are considered non-polar due to the very small difference in electronegativity between C and H atoms.

b. Of the two O-H bonds are more polar than the N-H bonds. This is because the electronegativity of O is greater than N, making O-H bonds more polar (large difference in electronegativity) than the N-H bonds.

2. To convert the following,

a. I2(s) --> I2(l)

Weak van der waals dispersion forces are broken in I2(s) to go to I2(l) state

b. H2O(s) ---> H2O(l)

strong intramolecular hydrogen bonding forces are broken when going from H2O(s) to H2O(l) state

c. NaI(s) --> NaI(l)

ionic interaction between Na+ and I- are broken in this case

d. C16H32(s) --> C16H32(l)

since it is hydrocarbon, weak london dispersion forces are broken down when going from s to l state.

3. In order for a substance to conduct electricity, it must have free moving charged particles,

a. In solid state, the charge transfer in a crystal in much faster and efficient and thus solids are better conductors than liquids.

b. molten sodium chloride still has free Na+ and Cl- ions and thus they may conduct electricity in molten form.

c. metals tends to have free valence electrons which are readily transferred by the meta-metal bonds, thus making the metals good conductor of electricity.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.