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Catalyst – December 88-(2x40.5) 2009

Catalyst – December 88-(2x40.5) 2009. Monday Mystery Element! It is very strong and very light. It is used in surgical pins and artificial hips. 10,000 pounds of this is used when making a Boeing 747. Weekly Goal!. Catalyst – December 88-(2x40.5) 2009. Monday Mystery Element!

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Catalyst – December 88-(2x40.5) 2009

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  1. Catalyst – December 88-(2x40.5) 2009 Monday Mystery Element! • It is very strong and very light. • It is used in surgical pins and artificial hips. • 10,000 pounds of this is used when making a Boeing 747. Weekly Goal!

  2. Catalyst – December 88-(2x40.5) 2009 Monday Mystery Element! • It is very strong and very light. • It is used in surgical pins and artificial hips. • 10,000 pounds of this is used when making a Boeing 747. TITANIUM

  3. Today’s Agenda • Catalyst • Endo/Exo Lingo! • Intro to Acids and Bases, pH, and Indicators • Lab Time • More Learnin! • Exit Question

  4. Today’s Objectives • SWBAT describe endothermic and exothermic reactions. • SWBAT classify substances as acidic, basic, or neutral using indicators.

  5. What happened during the 1st reaction? H3C6H5O7(aq) + NaHCO3(s)  CO2(g) + H2O(l) + Na3C6H5O7(aq) That’s right! It got…ICE COLD!!!

  6. What happened during the 2nd reaction? Mg(s) + HCl(aq)  H2(g) + MgCl2(aq) That’s right! It got…SPICY HOT!!!

  7. Why did the temperature change?!? • Because ENERGY is in the mix, y’all! Key Point #1: Every bond has energy holding it together. Breaking a bond requires energy. Forming new bonds releases energy. Unit for energy: kilojoules (kJ)

  8. Endothermic Reactions Key Point #2: If the total heat taken in by a reaction is more than the heat released, it is called an endothermic reaction. Net energy is absorbed! PRODUCTS REACTANTS

  9. Exothermic Reactions Key Point #3: If the total heat released by a reaction is more than the heat taken in, it is called an exothermic reaction. Net energy is released! REACTANTS PRODUCTS

  10. Which of these is endo/exo??? 1. 2 HCl + 185 kJ  H2 + Cl2 2. 4 NH3 + 5 O2  4 NO + 6 H2O + 1169 kJ 3. Cu + Cl2  CuCl2 + 220.1 kJ 4. H2O + C + 132 kJ  CO2 + 2H2

  11. Some Qu-Qu-Questions to ponder The combustion of the hydrocarbon glucose (C6H12O6) produces carbon dioxide, water, and releases 2830 kJ. Exo or Endo???

  12. Some Qu-Qu-Questions to ponder After absorbing 66.4 kJ of energy, 1 mole of nitrogen gas and 2 moles of oxygen gas react to form 2 moles of nitrogen monoxide. Exo or Endo???

  13. Acids and Bases

  14. WHY DO WE NEED TO KNOW ABOUT ACIDS AND BASES?

  15. Without ACIDS… You could NOT digest food! Cold drinks would NOT be the same!

  16. Without BASES… You could NOT get your body…or house…or car clean! You could NOT cure an upset stomach!

  17. The downside of some ACIDS… Acid rain destroys buildings and statues Acid in drinks damages tooth enamel Heart burn hurts!

  18. The downside of BASES… Bases slime your skin off.

  19. PROPERTIES OF….. Acids and Bases

  20. Acids PROPERTIES Key Point #1: Properties of acids: • Corrosive • Sour taste • pH less than 7

  21. Bases PROPERTIES Key Point #2: Properties of bases: • Soapy/slippery feel • Bitter taste • pH more than 7

  22. How do we tell if a substance is an acid or a base? Key Point #3: Scientists use INDICATORS to identify acids, bases, and neutral solutions. • An indicator is a substance that turns a certain color in the presence of an acid, base, or neutral solution. • A neutral solution is not acidic or basic.

  23. Litmus! • Litmus might sound like a terrible disease, but this is not true! • Litmus PAPER is a type of indicator used to identify acids, bases, and neutral solutions.

  24. Lab Time! • In this lab, you will be using the red and blue litmus paper to classify unknown solutions as acids, bases, or neutral solutions. • Place each color of litmus paper into each solution and record results in data table. • Hint for Post-Investigation Questions: • Lemon juice is an ACID • Ammonia is a BASE

  25. Red and Blue Litmus Paper • Red litmus paper turns blue in the presence of a base (doesn’t change color in acid) • Blue litmus paper turns pink/red in the presence of an acid (doesn’t change color in base)

  26. pH Scale Key Point #4: pH is a scale used to identify acids, bases, and neutral solutions. It ranges from 1-14. • Acids have a pH less than 7 • Bases have a pH more than 7

  27. Exit Question • Describe the difference between an endothermic reaction and an exothermic reaction. • If you have a solution that has a pH of 4.0, what color will it turn litmus paper? Is this solution an acid or a base? Please leave lab paper in folder!

  28. Exit Question • If you have a solution that has a pH of 4.0, what color will it turn litmus paper? Is this solution an acid or a base? Please leave lab paper in folder!

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