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Monday 5-6-13

Monday 5-6-13. Fill out planner for the week Note: the quiz on Wednesday is over properties of water, types of bonds, & pH. Update Journal Warm Up- Explain how to determine if a molecule is polar or nonpolar by looking at its structure. Check Homework. Acids, Bases and pH.

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Monday 5-6-13

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  1. Monday 5-6-13 • Fill out planner for the week Note: the quiz on Wednesday is over properties of water, types of bonds, & pH. • Update Journal • Warm Up- Explain how to determine if a molecule is polar or nonpolar by looking at its structure. • Check Homework

  2. Acids, Bases and pH

  3. Acids, Bases, and pH

  4. pH foldable notes Cut along dotted lines then Fold up Bottom folds The Hydrogen ion (H+) is the basis of pH (parts Hydrogen ion) The Scale measures how acidic or basic something is. Acids Neutrals Bases The pH scale Ranges from 0 to 14 0 1 2 3 4 5 *O is a strong Acid *5 is a weak Acid 6 7 8 *7 is a pure neutral substance • 10 11 12 13 14 *9 is a weak base *14 is a strong base

  5. Water, Acids and Bases • Water can split into two ions: H2O H+ + OH- • H+ or H3O+ is called a Hydronium Ion. • OH-is called hydroxide ion.

  6. pH foldable notes Fill in the following on your foldable Acids Neutrals Bases • Release H+ ions • The Higher the concentration of H3O+ (Hydronium ions) =‘s lower pH • Low concentration of OH- ions • H2O  H+ + OH- • Pure water Has equal amounts of hydronium (H+ or H3O+) and hydroxide (OH- ) ions • Release OH- ions • Contain a High concentration of OH- (Hydroxide) ions • Low concentration of H3O+ ions

  7. Acids • Strong acids have • a pH of 1-3 • Produce lots of • H+ ions

  8. Bases • Strong bases have a • pH of 11 to 14 • Contain lots of OH- • ions and fewer H+ ions

  9. Indicators(Top of page under title) • A substance that changes color in the presence of an acid or a base

  10. pH foldable notes Fill in the following on your foldable Acids Neutrals Bases • Turn Blue litmus paper red • Taste Sour • React with metals to form hydrogen gas Examples: • Do not change color of litmus paper. • When a base and an acid are mixed they produce neutral H2O & salt (Neutralization) • Turns Red litmus paper blue • Tastes bitter • Slippery to the touch Examples:

  11. Use this scale to complete the examples in your notes.

  12. pH and Biological Systems • Different organisms live well in different pH’s. • For example, bacteria in our stomach live well in an acidic environment.

  13. Enzymes, which control all the reactions in living organisms, work at different pH levels. • When the pH is changed this can have dramatic affect on those organisms. • If human blood is not between a pH of 7.35 & 7.45 it: • causes acidosis when it is too acidic • And alkalosis when it is too basic • Both of which can be deadly

  14. Most substances become more acidic if an acid is added to it and more basic if a base is added. • Buffers – substances that do not change pH when an acid or base is added to it. • Biological molecules can often keep the change from being too drastic.

  15. To Do: • Update SN • Worksheet

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