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9 Cards in this Set
- Front
- Back
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what is a mixture?
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a mixture is a physical blend of two or more substances. An important characteristic of mixtures is that their compositions may vary. example the air in a forest may differ from the ar in an industrial city, particularly in the amounts of pollutants.
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what are the two categories of mixtures?
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Mixtures can be heterogenous or homogeneous?
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what is a heterogeneous mixture?
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A heterogeneous mixture is one that is not uniformin composition. if you were to sample one portion of such a mixture , its composition would be different.
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What is a homogeneous mixture?
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A homogeneous mixture is one that has a completely uniform composition. It's components are evenly distributed throughout the sample. Saltwater is an example. Homogeneous mixtures are very important in chemistry. They are called solutions.
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What is a solution?
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a solution is a homogeneous mixture.
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what are some common types of solutions? Name by system and examples.
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System Gas-gas carbon Dioxide and oxygen in nitrogen (air) system; Liquid-gas water vaporin air (moist air); gas-liquid Carbon dioxide in water (soda water); liquid-liquid acetic acid in water (vinegar); Solid-liquid Sodium chloride in water (brine); solid-solid Copper in silver (sterling silver, an alloy)
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Phase
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any part of a system with uniform composition and properties is called a phase. A hogeneous mixture has a single phase. a heterogeneous mixture has two or more phases.
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Describe ways in which various components of amixture can be seperated.
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Physical-distillation,
Magnets- used to seperate iron fillings and sulfur |
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what is distillation and give an example.
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distillation is the process in which a liquid is boiled toproduce a vapor that is then condensed back inta a liquid.
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