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Entrance Question

Entrance Question. Mark the following as heterogeneous or homogeneous Salt water Orange juice Salad dressing Brass A ir. homogeneous. heterogeneous. heterogeneous. homogeneous. homogeneous. Solutions and Mixtures. 4-2. Describe the difference between the pictures below.

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Entrance Question

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  1. Entrance Question Mark the following as heterogeneous or homogeneous • Salt water • Orange juice • Salad dressing • Brass • Air homogeneous heterogeneous heterogeneous homogeneous homogeneous

  2. Solutions and Mixtures 4-2

  3. Describe the difference between the pictures below

  4. What is a mixture • Matter that is two or more substances together but is not chemically combined • Each substance keeps its own specific properties • Physical properties may change but not chemical • Substances can be present in any amount • Can be separated by physical means (boiling, filtering etc)

  5. What could change in a mixture? • Appearance may change, like the salt in salt water will dissolve and can no long be seen • Freezing or boiling points may change • BUT! No matter what the chemical composition of the materials do not change!

  6. Types of mixtures: heterogeneous • Mixture that is not the same throughout (not evenly mixed) • It is the least mixed • Example Granite Orange Juice The particles making up the mixture are often large and can be easily separated out Blood Smoke Paint Salad dressing

  7. Immiscible • Two or more liquids that do not mix These particles are in suspension the particles can settle out if they sit for a long time and be separated

  8. A second type of mixture: Homogeneous • Mixtures that are a uniform blend of substances • The same throughout • You can not see the individual particles • Will not separate if left to sit • Fresh water • Salt water • Rubbing alcohol • Nail polish remover • Brass • Gasoline • Air • CO2 in pop

  9. Type of homogeneous mixture: Colloids • Mixture with small particles that can’t be filtered out • Often look cloudy • Fog • Smoke • Egg whites • Milk • Blood • Whipped cream • paint

  10. Another type of homogeneous mixture: Solution Solvent Solute The thing being dissolved (salt, sugar, juice mix, etc) • The substance doing the dissolving (water typically)

  11. Solution • Properties of a solution • Usually can not be separated by physical means (filtering, picking out etc) • Best mixed of all mixtures • Particles are evenly distributed throughout entire mixture

  12. Soluble vs insoluble • Soluble – a substance dissolves in another • Insoluble – a substance will not dissolve in another • Will salt keep dissolving no matter how much you put into a glass of water? • Solubility – The amount of solute that can be completely dissolved in a given amount of solvent at a specific temperature.

  13. alloy • Two or more metals mixed together • Zinc + copper = brass • Tin + copper = bronze • Mercury + silver = amalgam

  14. Identify the solute when baking soda is dissolved in water. • Water • Baking Soda • The water baking soda mix • Colloids • I don’t know

  15. What term means uniform (same) throughout • Equilibrium • Heterogeneous • Exothermic • Homogeneous • I don’t know

  16. A mixture of two or more metals is called a(n) • Heterogeneous mixture • Alloy • Solution • Solvent • I don’t know

  17. Granite is an example of • A heterogeneous mixture • An alloy • A homogeneous mixture • A solution • I don’t know

  18. What type of heterozygous mixture has large particles that you could filter out easily • Suspensions • Colloids • Homogeneous mixture • Immiscible • I don’t know

  19. What term means will not mix • Suspension • Heterogeneous • Immiscible • Emulsions • I don’t know

  20. Write your answer on paper • A friend watches you stir a spoonful of sugar into a glass of clear lime drink. They say that sugar went away because it can not be seen anymore. How would you explain what happened to the sugar, and how could you show how you could get the sugar back.

  21. I would say that the sugar has dissolved, not disappeared. The sugar is now spread evenly throughout the drink, making it a homogeneous solution. To get the sugar back I could not filter it out, dissolved particles can not be filtered out no matter how fine of a filter is used. The only way to get the sugar back would be to evaporate the liquid. During evaporation, only the liquid water in the drink would evaporate, the sugar would be left behind as crystals on the glass. • My answer looks like yours and is similar in length and detail, I have used scientifically appropriate words and fully understand the question • My answer lacks supporting detail, I understand the question but did not answer in full detail, my answer is only half the length or less of yours. • My answer is weak, I used one or two words and did not complete my answer with any facts or vocabulary • Nope, didn’t get it, wrong idea, I am not on the right track.

  22. If vinegar is dissolved in water to make a weak acid, which substance is the solvent? • Water • Vinegar • The weak acid • The solution • IDK

  23. Which substance below is a heterogeneous mixture • Concrete • Sugar • Kool-aide • Water • IDK

  24. What type of mixture is made of tiny particles that will not settle out • Solution • Suspension • Colloids • Heterogeneous • IDK

  25. The best mixed of all mixtures • Solution • Heterogeneous • Colloids • Compounds • IDK

  26. What type of mixture is cereal • Homogeneous • Colloid • Solution • Heterogeneous • IDK

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