Ch 12 - Roy Kennedy Massachusetts Bay Community College...

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Unformatted text preview: Roy Kennedy Massachusetts Bay Community College Wellesley Hills, MA Introductory Chemistry , 3 rd Edition Nivaldo Tro Chapter 12 Liquids, Solids, and Intermolecular Forces 2009, Prentice Hall Tro's Introductory Chemistry, Chapter 12 2 Interactions Between Molecules Many of the phenomena we observe are related to interactions between molecules that do not involve a chemical reaction. Your taste and smell organs work because molecules in the thing you are sensing interact with the receptor molecule sites in your tongue and nose. In this chapter, we examine the physical interactions between molecules and the factors that effect and influence them. Tro's Introductory Chemistry, Chapter 12 3 The Physical States of Matter Matter can be classified as solid, liquid, or gas based on what properties it exhibits. State Shape Volume Compress Flow Solid Fixed Fixed No No Liquid Indef. Fixed No Yes Gas Indef. Indef. Yes Yes Fixed = Keeps shape when placed in a container. Indefinite = Takes the shape of the container. Tro's Introductory Chemistry, Chapter 12 4 Structure Determines Properties The atoms or molecules have different structures in solids, liquids, and gases, leading to different properties. Tro's Introductory Chemistry, Chapter 12 5 Properties of the States of Matter: Gases Low densities compared to solids and liquids. Fluid. The material exhibits a smooth, continuous flow as it moves. Take the shape of their container(s). Expand to fill their container(s). Can be compressed into a smaller volume. Tro's Introductory Chemistry, Chapter 12 6 Properties of the States of Matter: Liquids High densities compared to gases. Fluid. The material exhibits a smooth, continuous flow as it moves. Take the shape of their container(s). Keep their volume, do not expand to fill their container(s). Cannot be compressed into a smaller volume. Tro's Introductory Chemistry, Chapter 12 7 Properties of the States of Matter: Solids High densities compared to gases. Nonfluid. They move as an entire block rather than a smooth, continuous flow. Keep their own shape, do not take the shape of their container(s). Keep their own volume, do not expand to fill their container(s). Cannot be compressed into a smaller volume. Tro's Introductory Chemistry, Chapter 12 8 The Structure of Solids, Liquids, and Gases Tro's Introductory Chemistry, Chapter 12 9 Liquids The particles in a liquid are closely packed, but they have some ability to move around. The close packing results in liquids being incompressible. But the ability of the particles to move allows liquids to take the shape of their container and to flow. However, they dont have enough freedom to escape and expand to fill the container(s). Tro's Introductory Chemistry, Chapter 12 10 Solids The particles in a solid are packed close together and are fixed in position....
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Ch 12 - Roy Kennedy Massachusetts Bay Community College...

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