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Solutions

Solutions. Subtopics include: (1) Describing Solutions, (2) Concentrations, (2) Solubility & (3) the Effects of Solutes on Solutions. Solutions. Describing Solutions. Define: solution, solute, solvent, suspensions, colloidal dispersions, distillation filtration & chromatography.

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Solutions

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  1. Solutions Subtopics include: (1) Describing Solutions, (2) Concentrations, (2) Solubility & (3) the Effects of Solutes on Solutions.

  2. Solutions

  3. Describing Solutions Define: solution, solute, solvent, suspensions, colloidal dispersions, distillation filtration & chromatography. Explore types of solutions. Identify homogenous mixtures that are not solutions. Identify the process of separating solutions: distillation, filtration & chromatography. Molecular Set: 3 water molecules, 2 hydrogen florides, 2 Iodines

  4. Aim: How can we describe solutions? Essential Questions: • What is a solution? • What are some types of solutions? • How do we separate solutions? Explain. Key Words: solution, solute, solvent, suspensions, colloidal dispersions, distillation, filtration, chromatography.

  5. Name Some Solutions! Q: What are some solutions you have encountered today?

  6. Which One is a Solution? SaltWater Oil Water • The Salt Water • The Oil Water • Both • Neither

  7. Deduction Q: Based on the previous example, how can we describe a solution?

  8. Notes • Describing Solutions • Definitions • Solution - homogenous mixture of a solute dissolved in a solvent.

  9. Solutes, Solvents & Solutions Solute Solution Solvent

  10. Notes 2. Solute – 3. Solvent – 4. Solution –

  11. What Makes Solutions Homogenous? Water and rubbing alcohol have different densities so why don’t they separate themselves into layers based on their densities as shown in the picture? Why do they form solutions instead? What makes their atoms arrange together homogenously? ---

  12. Notes B. “Like Dissolves Like” • In a solution, all particles attract each other with intermolecular forces of similar strength. • Polar substances dissolve other polar substances and ionic substances. • Nonpolar substances dissolve other nonpolar substances.

  13. Solutions Exist Between Particles in Different States (Gas, Liquid, Solid)! Can you think of any examples.

  14. Notes C. States of Matter & Solutions • The solute and solvent may be in different phases as long as the particles are evenly distributed amongst each other. • Ex: Solid NaCl dissolved in liquid water. • Ex: Gaseous CO2 is dissolved in liquid soda. • All mixtures of gases are solutions.

  15. Solutions Among Various Phases of Matter

  16. How Do We Determine Which Substance is a Solute & Which is the Solvent?

  17. Notes D. Identification of Solutes vs. Solvents • If the solute and solvent are in different phases, then solute assumes the solvent’s phase. • If the solute and solvent are in the same phase, then the solvent is the one that there is more of.

  18. Our Chemistry class has run out of salt and we want to make a new batch from collected sea water. How do I separate the salt from the water?

  19. E. Separating Solutions

  20. Video Clip Distillation http://www.youtube.com/watch?v=mP4Hgui-g6U&playnext=1&list=PL73CDD6FFC04D04A4&feature=results_main

  21. Cont’d

  22. Filtration

  23. Learning Check 1) The solvent is the part of the solution that A. gets dissolved B. does the dissolving C. changes phase 3) What is a solution? 4) What are some types of solutions? 5) How do we separate solutions? Explain.

  24. Notes Describing & Separating Solutions

  25. Describing Solutions • Definitions • Solution - homogenous mixture of a solute dissolved in a solvent. • Solute – substance dissolved. • Solvent – substance that does the dissolving. • Solution – A homogenous mixture composed on tiny particles. • “Like Dissolves Like” • In a solution, all particles attract each other with intermolecular forces of similar strength. • Polar molecules dissolve other polar molecules and ionic compounds. • Nonpolar molecules dissolve nonpolar molecules. 2. In gasses there are essentially no intermolecular forces, therefore all mixtures of gasses are solutions. C. States of Matter & Solutions • The solute and solvent may be in different phases as long as the particles are evenly distributed amongst each other. • Ex: Solid NaCl dissolved in liquid water. • Ex: Gaseous CO2 is dissolved in liquid soda. D. Identification of Solutes vs. Solvents • If the solute and solvent are in different phases, then solute assumes the solvent’s phase. • If the solute and solvent are in the same phase, then the solvent is the one that there is more of.

  26. E. Suspensions – suspensions are formed by the physical homogenous mixture of large particles. (Solutions are made by the chemical mixture of smaller particles). • Suspensions will settle in time (solutions will not). • A light bean passing through a suspension mixture will be visible (in a solution, it will not). • Ex. Sand + Water F. Colloidal Dispersion – formed when particles larger than those in solution but smaller than those in suspensions are dispersed in a medium • The terms dispersed substance vs dispersed medium are used for colloidal dispersion instead of solute and solvent. • A colloidal dispersion will not settle. • Tyndall effect: a light beam passing through will be clearly visible. • Ex. Whipped cream, mayonnaise, paint, gelatin & marshmallow.

  27. G. Separating Solutions • Evaporation– separates dissolved SOLUTE from SOLUTION. • Ex. Separating salt from water • Simple distillation– separates solvent from solution • Ex. Obtaining pure water from sea water • Fractional distillation– separates one liquid from a mixture of different liquids that have different boiling points. • Ex. Obtaining ALCOHOL from wine or oxygen/nitrogen from air.

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