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Representative Gases & Properties of Gases - State the five assumptions of the Kinetic-Molecular Theory of gases.

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Introduction

Representative Gases & Properties of Gases 1. State the five assumptions of the Kinetic-Molecular Theory of gases. a) Gases consist of large numbers of tiny particles. These particles, usually molecules or atoms, typically occupy a volume about 1000 times larger than occupied by the same number of particles in the liquid or solid state. Thus molecules of gases are much further apart than those of liquids or solids. Most of the volume occupied by a gas is empty space. This accounts for the lower density of gases compared to liquids and solids, and the fact that gases are easily compressible. b) The particles of a gas are in constant motion, moving rapidly in straight lines in all directions, and thus passes kinetic energy. The kinetic energy of particles overcomes the attractive forces between them except near the temperature at which the gas condenses and becomes a liquid. Gas particles travel in random directions at high speeds. c) The collisions between particles of a gas and between particles and container walls are elastic collisions. An elastic collision is one in which there is no net loss of kinetic energy. ...read more.

Middle

The spontaneous mixing of the particles of two substances because of their random motion is referred to as diffusion. f) Exertion Gases also have the ability to exert pressure on a surface. 3. Methods of production of the representative gases. 1) Balanced equations required: a) Oxygen (2 methods): One method of preparation is decomposing hydrogen peroxide. Oxygen can be prepared by passing hydrogen peroxide through a catalyst, manganese dioxide. It is then collected by water displacement. The second method is decomposing water through electrolysis. Electricity is passes though water, separating Hydrogen and Oxygen. Method 1: 2H2O2(aq) -MnO2� 2H2O(l) + O2(g). Method 2: 2H2O(l) -electrical energy� 2H2(g) + O2(g). b) Ozone (1 method): If enough energy is present, O2 will become O3. Method: 3O2(g) + energy � 2O3(g). c) Hydrogen (2 methods): One of the methods of preparing Hydrogen is just like preparing Oxygen, through the use of electrolysis. Method 1: Method 2: 2H2O(l) -electrical energy� 2H2(g) + O2(g). Another commonly used method is reacting metals with acids. Method 2: Zn(s) + H2SO4(aq) � ZnSO4(aq) + H2(g). d) Ammonia (1 method): The Haber Process is the catalytic systhesis of ammonia from nitrogen gas and hydrogen gas. ...read more.

Conclusion

If Oxygen was in a test tube and you placed a buring splint up to it, it should suck the flame in and make a "pop" sound. Or it would re-ignite a glowing splint. oOnly Oxygen and Ozone have color in their liquid and solid states. oOnly Carbon Dioxide, Ozone, and Ammonia have odor. The most difficult gas to identigy would be Hydrogen. 7. Define allotrope Allotrope - One of the two or more forms of an element that exists in the same physical state. 8. What is a eudiometer? Eudiometer - A eudiometer is a gas collecting tube. 9. What kinds of attractive forces exists between molecules? Describe all three. How are these attractive forces different from those we stuidied previously? Intermolecular forces - The forces of attraction between molecules. Dipole-dipole forces - The forces of attraction between polar molecules. London dispersion forces - Intermolecular attractions resulting from the constant motion of electrons and the creation of intantaneous dipoles and induced dipoles. 10. What is an ideal gas? When does a real gas behave like an ideal gas? An ideal gas is a gas that fits the kinetic molecular theory perfectly. Noble gases tend to behave like an ideal gas. Real gases behave like an ideal gas when it fits the 5 assumptions of KMT. ...read more.

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