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Warm-up: How do substances dissolve?

Warm-up: How do substances dissolve?.

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Warm-up: How do substances dissolve?

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  1. Warm-up: How do substances dissolve?

  2. Salt is used in ice cream because of a special property it possesses: It lowers the freezing temperature of water. Consider making the most basic ice cream. You would mix together milk or cream, sugar and maybe eggs and some vanilla. But this mixture has to be frozen in order for it to become ice cream. You could try to pack it with ice, but milk just isn't going to freeze at 32 degrees F (0 degrees C), so you're going to need a little help. That's where salt comes in. If you pour salt on ice, it creates a briny mix that has a temperature nearing 0 degrees F (-18 degrees C) -- it's not "solid" like ice is, but it's nonetheless colder! This brine is so cold that it can easily freeze your ice cream mixture.

  3. Characteristics of a Solution

  4. Materials: 5 white cups marked 20 ml. • Glass jars half filled with water. • Measure 20 ml** of each substance using • a small white cup that has been pre marked. • Pour contents of white cup into clear glass jar. • Mark the appropriate column in your chart. • Stamped for accurate information. • *** only 5 ml of soap!!!!

  5. Page 398 in wk bkto be covered in today’s lesson. Please go ahead and write down these questions….. • What do acids release in water? • 2. What ion do acids make when they interact with water? • 3. What do bases release in water? • 4. How do acids taste? • 5. How do bases feel?

  6. Acids • Releases hydrogen ions, H+ when dissolved in water (hydrogen ions) • H+ ions interact with water molecules to form H3O+ ions (hydronium ions). • taste sour • corrosive • can react with metals • react with indicators to produce predictable changes in color

  7. An indicator is an organic compound that changes color in acid and base.

  8. Common acids: Vinegar, aspirin, vitamin C, Carbonic acid, Hydrochloric acid, nitric acid, Phosphoric acid, Sulfuric acid

  9. Bases • forms hydroxide ions, OH_ in a water solution • Any substance that accepts H+ from acids • opposite of acids • are crystalline solids in the pure, undissolved • state • feel slippery in solution • bitter taste • corrosive • react with indicators to produce changes in color

  10. Common bases Antacids, mortar and plaster, laxatives, Soaps, fertilizer, to make rayon and nylon

  11. Many of the products that rely on the chemistry of acids and bases are solutions. Because of its polarity, water is the main solvent in these products.

  12. When an acid dissolves in water, the negative areas of nearby water molecules attract the positive hydrogen in the acid. (H3O)

  13. Unlike acid dissociation, water molecules do not combine with the ions formed from the base ( they just dissolve into separate molecules).

  14. The strength of an acid or base depends on how many acid or base particles dissociate into ions in water. Ions in solution can conduct an electric current. The strong acid solution conducts more current.

  15. Acids and bases United streaming

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