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Routine #3

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Routine #3

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  1. 1) Half Sheet: Think  Share  Pair Write down your thoughts, then share and write down your partner’s thoughtsBases often exhibit all of the following properties EXCEPT? A. feeling soapy & slippery B. tasting bitter C. releasing hydrogen gas when reacted with metals D. neutralizing acid2) Worksheet #123) QUIZ #6

  2. Did you know that some juices and vinegar taste sour because of the chemical properties of the acid in those liquids? And that when acids and bases are mixed together, they always counteract each other, producing water and a salt? • For thousands of years people have known that vinegar, lemon juice and many other foods taste sour. However, it was not until a few hundred years ago that it was discovered why these things taste sour - because they are all acids. The term acid, in fact, comes from the Latin term acere, which means "sour". While there are many slightly different definitions of acids and bases, in this lesson we will introduce the fundamentals of acid/base chemistry.

  3. In the seventeenth century, the Irish writer and amateur chemist Robert Boyle first labeled substances as either acids or bases (he called bases alkalies) according to the following characteristics: • Acids taste sour, are corrosive to metals, change litmus (a dye extracted from lichens) red, and become less acidic when mixed with bases. • Bases feel slippery, change litmus blue, and become less basic when mixed withacids. • While Boyle and others tried to explain why acids and bases behave the way they do, the first reasonable definition of acids and bases would not be proposed until 200 years later.

  4. Routine #3 • Arrange into groups of 4 • One person read page 329, one person read page 330, one person read page 331, and one person read page 332 • Then talk as a group about how all 4 pages connect and what they have in common • Then fill out Extend and Challenge

  5. Routine #4 • You Tube: Acid Base Reactions in Solution: Crash Course • Video

  6. QUIZ #6 • Name one property of an acid • Name one property of a base • If a substance has a pH of 2, is it an acid or a base?

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