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Unformatted text preview: Mixtures Mixtures
Unit III Properties of Matter BELLWORK BELLWORK What is a mixture? How can it be separated? Can you provide another example?. BELLWORK BELLWORK Mixtures Mixtures
A mixture is a physical blend of two or mixture physical more substances. Their composition varies (Air). There are two types of mixtures: There homogenous and heterogenous homogenous Mixtures Mixtures
Heterogenous mixtures Heterogenous Is the type of mixture that is not uniform in composition. composition. If you were to sample one portion of such a mixture, it’s composition would be different from that of another portion. different Mixtures Mixtures
Homogenous mixture Homogenous Is the type of mixture that has a completely uniform composition throughout itself. throughout It’s components are evenly distributed throughout the sample. Homogenous or Heterogenous? Homogenous
1. 2. 3. 4. 5. 6. 7. Air Salt water Tea Brass Vinegar Hydrogen peroxide Steel 1. 2. 3. 4. 5. 6. 7. Salad dressing Apple Sand Paint Granite Laundry detergent Cereal Solutions Solutions Is Is the special name that scientists give to homogenous mixtures. homogenous Solutions may be gases, liquids or solids. An example: solution of sugar in water. Solutions Solutions
Some common types of solutions System Examples Gas-gas CO2 and O in N (air) Gas-gas Liquid-gas Water vapor in air CO2 in H2O (Soda water) Gas-liquid Liquid-liquid Solid-liquid Solid-solid
Acetic acid in H2O (vinegar) NaCl in H2O (brine) NaCl Cu in Ag (Sterling silver) Phases Phases Any Any part of a system with uniform composition and properties is called a composition phase. phase On a homogenous mixture you have “one On phase” only. phase” On a heterogenous mixture you have “two On or more phases”. or Phases in a heterogenous mixture Phases Phases in a homogenous mixture Phases Separating Mixtures Separating
Suppose you had a mixture of iron nails, salt and water… salt How would you separate this mixture completely? Based on which physical properties would you base your method on? Separating Mixtures Separating
How would you separate the components in tap water? in Distillation Distillation A liquid is boiled to produce vapor that is then condensed again to a liquid Separating Mixtures Separating Mixtures Mixtures
Sample problem How can a mixture of iron fillings and aluminum fillings be separated? fillings 1.-Analyze: Plan a problem solving strategy 1.-Analyze: List the properties of iron and aluminum and look for something that would be useful in separating the mixture separating Mixtures Mixtures
2.- Solve: Apply the problem-solving strategy. Iron: Metal Grayish Not soluble in water Attracted to a magnet Aluminum: Metal Grayish Not soluble in water Not attracted to magnets Make use of a property that differentiates the metals; use a magnet to attract the iron fillings. Mixtures Mixtures
3.-Evaluate: Does the result make sense? Because the magnet attracts iron but not aluminum filings, the iron would be removed while the aluminum would be left behind. while Practice Problems Practice What What physical properties could be used to separate iron filings from salt? separate Which of the following are homogenous? Which heterogenous? heterogenous?
1.-Spaghetti sauce 4.-Cough syrup 1.-Spaghetti 2.-Glass 5.-Mixture of nitrogen gas 2.-Glass 3.-Muddy Water and helium gas 3.-Muddy This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com Is home to well over a thousand powerpoints submitted by teachers. This a free site. Please visit and I hope it will help in your teaching ...
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- Spring '08