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10 th Grade Chemistry: 1/27/14

Learning Target: Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties. 10 th Grade Chemistry: 1/27/14.

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10 th Grade Chemistry: 1/27/14

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  1. Learning Target: Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties. 10th Grade Chemistry: 1/27/14 Must Do: Use iPadsto Google and read about Decomposition and Synthesis reactions. Write down your interpretations and think about how you would write equations for the decomposition and synthesis of water. Puzzle Warm-up • Agenda: • Must Do • WWK • Brief Lesson/video • iPadChemMahjong Smack down

  2. WWK L L + L

  3. Fuel Cell • Fuel cell • A device that produces electricity by combining a fuel, usually hydrogen, with oxygen. In this reaction, electrons are freed from the hydrogen in the fuel cell by a catalyst, and gain energy from the chemical reaction binding hydrogen and oxygen; this provides a source for electric current. Noun a device that produces a continuous electric current directly from the oxidation of a fuel, as that of hydrogen by oxygen.

  4. Goal for this unit • Write a complete and balanced chemical equation from a prompt • Example: Write the chemical equation for the reaction of Magnesium metal and Chlorine gas to form magnesium chloride • Balance the reaction • What type of reaction is this?

  5. Reaction Classification • Five Types or Reactions (VIDEO) • Decomposition • Synthesis • Single Replacement • Double Replacement • Combustion

  6. Decomposition • NI3 I2 + N2 • The starting material (reactant) in this case is a VERY unstable and highly explosive solid…too unstable to use as an explosive. • Whilst we wait for the Ammonium hydroxide and iodine to be delivered to my house (I’m sure I’m on HSA’s watch list now) this video will give you a good preview. • 2H2O  2H2 + O2 • This reaction takes a lot of energy to drive from reactant to product (luckily!) • Can you think of a process that we use to drive this reaction forward? It’s one of your vocabulary words.

  7. Electrolysis • We can drive the decomposition of water with an electric current. • Video Link When a potential greater than 2.06 V is applied such that the forward cell has a positive potential, the following reactions take place.

  8. Synthesis • We discussed how the reaction 2H2 + O22H2O is a synthesis reaction. This reaction is classified as spontaneous, though H2 and O2 will react very slowly unless some energy (a spark) is applied to the mixture (this is formally called “activation energy”). Can you think of a way to use this reaction to generate electrical energy?

  9. Fuel Cell!!

  10. Chem Mahjong! • I’ve loaded the Chem Mahjong app on all the iPads • I know that sounds pretty nerdy, but it’s kind of fun • High score gets bragging rights…maybe some chocolate. • The one to play is the polyatomic ions in x-board format. • The goal is to help you to memorize the formulas in a way that isn’t as painful, and dreadfully boring as flash cards.

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