Chemistry Essay

1876 WordsMay 14, 20138 Pages
Chapter 14: THE BEHAVIOR OF GASES 14.1 Properties of gases Key concepts: Why are gases easier to compress than solids or liquids are? What are the three factors that affect gas pressure? Vocabulary Compressibility Compressibility: When a car comes to a sudden stop, the people in the car will continue to move forward unless they are restrained. The driver and any passengers are more likely to survive a collision if they are wearing seatbelts to restrict their forward movement. Compressibility: is a measure of how much the volume of matter decreases under pressure. When a person collides with an inflated air bag, the impact forces the molecules of gas in the bag closer together. The compression of the gas absorbs the energy of the impact. Kinetic theory can explain why gases are compressed more easily than solids and liquids. Gases are easily compressed because of the space between the particles in the gas. Factors Affecting Gas Pressure: Kinetic theory can help explain other properties of gases, such as their ability to expand and take the shape and volume of their containers. The particles move along straight line paths until they collide with other particles or the walls of their containers. The motion of the particles is a constant and random. Because there are no significant forces of attraction or repulsion among particles in a gas, particles in a gas can move freely. Four variables are generally used to describe a gas. The variables and their common units are pressure (P) in kilopascals, volume (V) in liters, temperature (T) in kelvins, and the number of moles (n). The amount of gas, volume, and temperature are factors that affect gas pressure. Amount of gas: When a gas is pumped into a closed rigid container, the

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