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Table of Contents

Explore the properties and behaviors of solids, liquids, and gases. Learn about changes of state, gas behavior, and how pressure, temperature, and volume affect gases.

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Table of Contents

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  1. Table of Contents • States of Matter • Changes of State • Gas Behavior • Graphing Gas Behavior

  2. - States of Matter Solids • A fixed, closely packed arrangement of particles causes a solid to have a definite shape and volume.

  3. In amorphous solids, the particles are not arranged in a regular pattern. - States of Matter Solids • Solids that are made up of crystals are called crystalline solids.

  4. - States of Matter Liquids • Because its particles are free to move, a liquid has no definite shape. However, it does have a definite volume.

  5. - States of Matter Gases • As they move, gas particles spread apart, filling all the space available. Thus, a gas has neither definite shape nor definite volume.

  6. Key Terms: Examples: surface tension viscosity gas - States of Matter Building Vocabulary • A definition states the meaning of a word or phrase by telling about its most important feature or function. After you read the section, reread the paragraphs that contain definitions of Key Terms. Use all the information you have learned to write a definition of each Key Term. Key Terms: Examples: solid A solid has a definite shape and a definite volume. Surface tension is the result of an inward pull among the molecules of a liquid that brings the molecules on the surface closer together. crystalline solid Solids that are made up of crystals are called crystalline solids. Another property of liquids is viscosity—a liquid’s resistance to flowing. amorphous solid In amorphous solids, the particles are not arranged in a regular pattern. Like a liquid, a gas is a fluid. Unlike a liquid, however, a gas can change volume very easily. liquid A liquid has a definite volume but no shape of its own. fluid A liquid is also called a fluid, meaning “a substance that flows.”

  7. - States of Matter Viscosity • Click the Video button to watch a movie about viscosity.

  8. End of Section:States of Matter

  9. - Changes of State Changes Between Solid and Liquid • The change in state from a solid to a liquid is called melting.

  10. - Changes of State Changes Between Solid and Liquid • The change of state from liquid to solid is called freezing.

  11. - Changes of State Temperature and Changes of State • A beaker of ice at –10ºC was slowly heated to 110ºC. The changes in the temperature of the water over time were recorded. The data were plotted on the graph shown here.

  12. Temperature (ºC) on the y-axis, time (minutes) on the x-axis Reading Graphs: What two variables are plotted on the graph? - Changes of State Temperature and Changes of State

  13. The temperature is rising from 0ºC to 100ºC. Reading Graphs: What is happening to the temperature of the water during segment C of the graph? - Changes of State Temperature and Changes of State

  14. Segment B: melting point of ice; segment D: boiling point of water Interpreting Data: What does the temperature value for segment B represent? For segment D? - Changes of State Temperature and Changes of State

  15. Change from solid to liquid; change from liquid to gas Drawing Conclusions: What change of state is occurring during segment B of the graph? For segment D? - Changes of State Temperature and Changes of State

  16. Water molecules in segment E have more thermal energy because they are at a higher temperature. Inferring: In which segment, A or E, do the water molecules have more thermal energy? Explain your reasoning. - Changes of State Temperature and Changes of State

  17. - Changes of State Outlining Changes in State • As you read, make an outline about changes of state. Use the red headings for the main topics and the blue headings for the supporting ideas. • Changes Between Solid and Liquid • Melting • Freezing • Changes Between Liquid and Gas • Evaporation • Boiling • Boiling Point and Air Pressure • Condensation • Changes Between Solid and Gas

  18. - Changes of State Data Sharing Lab • Click the PHSchool.com button for an activity about sharing data for the Skills Lab Melting Ice.

  19. End of Section:Changes of State

  20. - Gas Behavior A Change in Pressure • A punctured basketball deflates as gas particles begin to escape.

  21. - Gas Behavior Using Formulas • Pressure can be calculated using the formula below. Force is measured in newtons (N). If area is measured in square meters (m2), pressure is expressed in pascals (Pa). • Pressure = Force/Area • For example, a machine exerts a force of 252 N on a piston having an area of 0.430 m2. What is the pressure in pascals on the piston? • Pressure = 252 N/0.430 m2 = 586 Pa

  22. Practice Problem A trash compactor exerts a force of 5,600 N over an area of 0.342 m2. What pressure in pascals does the compactor exert? P = 5,600 N/0.342 m2 = 16,374 Pa - Gas Behavior Using Formulas

  23. - Gas Behavior Pressure and Volume • As weights are added, the gas particles occupy a smaller volume. The pressure increases.

  24. - Gas Behavior Pressure and Temperature • When a gas is heated, the particles move faster and collide more often with each other and with the walls of their container. The pressure of the gas increases.

  25. - Gas Behavior Gas Laws Activity • Click the Active Art button to open a browser window and access Active Art about gas laws.

  26. - Gas Behavior Volume and Temperature • Changing the temperature of a gas at constant pressure changes the volume similarly.

  27. - Gas Behavior Asking Questions • Before you read, preview the red headings. In a graphic organizer like the one below, ask a what or how question for each heading. As you read, write answers to your questions. Questions Answers What measurements are useful in studying gases? Volume, temperature, and pressure How are the pressure and volume of gases related? When the pressure of a gas increases at constant temperature, its volume decreases. How are the pressure and temperature of gases related? When the temperature of a gas increases at constant volume, its pressure increases. How are the volume and temperature of gases related? When the temperature of a gas increases at constant pressure, its volume increases.

  28. End of Section:Gas Behavior

  29. - Graphing Gas Behavior Making a Graph • The x-axis (horizontal) and the y-axis (vertical) form the “backbone” of a graph.

  30. - Graphing Gas Behavior Temperature and Volume • As the temperature of the water bath increases, the gas inside the cylinder is warmed by the water.

  31. - Graphing Gas Behavior Temperature and Volume • The data from the experiment are recorded in the notebook table.

  32. - Graphing Gas Behavior Temperature and Volume • The graph of Charles’s law shows that the volume of a gas is directly proportional to its kelvin temperature under constant pressure.

  33. - Graphing Gas Behavior Pressure and Volume • Pushing on the top of the piston decreases the volume of the gas. The pressure of the gas increases.

  34. - Graphing Gas Behavior Pressure and Volume • The data from the experiment are recorded in the notebook table.

  35. - Graphing Gas Behavior Pressure and Volume • The graph of Boyle’s law shows that the pressure of a gas varies inversely with its volume at constant temperature.

  36. - Graphing Gas Behavior Previewing Visuals • Before you read, preview Figure 23. In a graphic organizer like the one below, write questions that you have about the diagram. As you read, answer your questions. Graphing Charles’s Law Q. What is the relationship between temperature and volume? A. The volume of a gas is directly proportional to its temperature under constant pressure. Q. What does the dotted line show? A. The dotted line predicts how the graph would look if the gas could be cooled further.

  37. - Graphing Gas Behavior Links on Gases • Click the SciLinks button for links on gases. • Some sample links from SciLinks are found on the next slide!

  38. http://kids.earth.nasa.gov/archive/air_pressure/balloon.html http://www.nclark.net/GasLaws.html http://www.pbs.org/wgbh/nova/balloon/virtual/virtual.html

  39. End of Section:Graphing Gas Behavior

  40. Graphic Organizer Solids, Liquids, and Gases Example (at room temperature) State of Matter Shape Volume Solid Definite Definite Diamond Liquid Not definite Definite Water Gas Not definite Not definite Oxygen

  41. End of Section:Graphic Organizer

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