24 - Topics for the day Administrative stuff Gases,...

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Topics for the day Administrative stuff Gases, Liquids, Solids Properties of Gases The Gas Laws Boyle’s law Charles’ law Avogadro’s law Ideal gas law Applications of the ideal gas law Administrative stuff Homework ALEKS Objective 3 over ALEKS Objective 4 due in one week (3/29 at 10 am) ALEKS prep also due (3/29 at midnight) How to access ALEKS Revision topics in ALEKS Obj 3 Limiting reactants (Section 3.9) Solutions and dilutions (Section 4.3) Precipitation reactions, solubility (Section 4.5. Table 4.1) Blackboard grade book now shows both exams and Fve completed homeworks Beckman Scholar competition Science Study Break this Wednesday
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Gases, Liquids, Solids Time to change direction entirely. After half a semester talking about theoretical ideas and understanding chemical bonds, it’s time to get more practical and talk about the phases of matter. Gases, liquids and solids, are covered in Chapters 5 and 16. We’ll start with gases . We’ll Fnd that simple models that explain most of gases behaviour are based on the idea that gas molecules are pretty much all the same, and that everything we learned about chemical bonding is pretty irrelevant to studying gases. This makes them boring, but easy. When we move to the condensed phases ( liquids and solids ), we’ll learn about intermolecular forces , and Fnd out that what we learned about chemical bonding will be very useful in explaining and predicting the properties of these phases of matter. Properties of gases I called liquids and solids “condensed phases”. Molecules in the gas phase are very far apart from each other, whereas molecules in their liquid or solid state are much closer together. This can be seen by looking at the density of these phases of matter. Density (g mL –1 ) Solid Liquid Gas CCl 4 1.70 1.59 0.00503 H 2 O 0.917 0.998 0.000588 Gas density << Liquid/Solid densities
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Low density Compressible Expands to ft the available volume Applies a Force (pressure) to all sides oF the containing vessel Miscible (mixes completely with any other gas unless they react) Properties of gases Pressure Pressure is defned as the Force per unit area applied to an object in a direction perpendicular to its surFace. Pressure = Force Area Evangelista Torricelli created the frst barometer using a tube flled with mercury, and used it to measure air pressure in 1643.
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24 - Topics for the day Administrative stuff Gases,...

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