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Phases of Matter SolidLiquid Gas Visualize it! Quiz.

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Presentation on theme: "Phases of Matter SolidLiquid Gas Visualize it! Quiz."— Presentation transcript:

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2 Phases of Matter SolidLiquid Gas Visualize it! Quiz

3 Heating/cooling curves: Sublimation is when a solid goes directly to a gas without passing through the liquid phase. Heat of fusion potential energy increases kinetic energy remains the same Heat of vaporization potential energy increases kinetic energy remains the same Answers to odd questions page 47-48

4 K = C C = K Answers to odd questions page 49

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6 Q = M * C* Change in T

7 Heat of fusion is the amount of energy needed to melt one gram of ice into water at 0 degrees Celsius 343 J / g

8 Heat of vaporization is the amount of heat needed to evaporate 1 gram of water at 100 degrees Celsius H f = 2260 J /g

9 Answers to odd questions page Ex: 25 grams of water are cooled from 20 o C to 10 o C What is the # of joules of heat energy released? It involves a change in temp so use the formula Q = M x C x (change in T) M = 25 grams; C = 4.18 J/g x o C Change in T = 10 Answer = 1045 J Ex: What are the total # of Joules needed to heat 150g of ice to water at 0 o C. No temp change and ice to water means heat of fusion. H f = 334 J/g ; Mass = 150 g Answer: 334J x 150 = 50100J Ex : How many Joules of heat are needed to vaporize 100g of water to vapor at 100 o C. No temp. change and 100 o C. H v = 2260 J/g ; Mass = 100 g Answer: 2260J x 100 = J

10 Kinetic Molecular Theory Postulates of the Kinetic Molecular Theory of Gases 1.Gases consist of tiny particles (atoms or molecules) 2.These particles are so small, compared with the distances between them, that the volume (size) of the individual particles can be assumed to be negligible (zero). 3. The particles are in constant random motion, colliding with the walls of the container.? These collisions with the walls cause the pressure exerted by the gas. 4. The particles are assumed not to attract or to repel each other. 5. The average kinetic energy of the gas particles is directly proportional to the Kelvin temperature of the gas

11 Kinetic Theory and the Gas Laws Dorin, Demmin, Gabel, Chemistry The Study of Matter ?, 3 rd ?Edition, 1990, page 323 (newer book)

12 A Gas Sample is Compressed Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 429

13 Boyles Law Timberlake, Chemistry 7 th ?Edition, page 253

14 P vs. V (Boyles Data) Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 404

15 Boyles Law Illustrated Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 404

16 Charles?s Law Timberlake, Chemistry 7 th ?Edition, page 259

17 Plots of V vs. T (Different Gases) Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 407

18 Ideal vs. Real Gases No gas is ideal. As the temperature of a gas increases and the pressure on the gas decreases the gas acts more ideally. Answers to odd questions page

19 Gas Mixtures and Daltons Law Daltons law states that the pressure of the total system is equal to the sum of all the partial pressures.

20 Filtration is used to separate Heterogeneous solutions. Large particles which are not dissolved in the solution are easily separated using filters. Heterogeneous Mixtures

21 Chromotography Distillation Separation of Homogeneous mixtures Separates substances based on boiling points Answers to Odd questions page 59


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