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Quiz and Endo/Exo

Quiz and Endo/Exo. : |. Worksheet #4 Out on Desk. Warm Up. EQ: How do score 85%+++ on our quiz? HOT Q1: What does the Law of Conservation of Energy state? HOT Q2: What is an endothermic rxn? HOT Q3: What is an exothermic rxn?. Balance Al + HCl  H 2 + AlCl 3

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Quiz and Endo/Exo

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  1. Quiz and Endo/Exo : |

  2. Worksheet #4 Out on Desk Warm Up EQ: How do score 85%+++ on our quiz? HOT Q1: What does the Law of Conservation of Energy state? HOT Q2: What is an endothermic rxn? HOT Q3: What is an exothermic rxn? • Balance Al + HCl  H2 + AlCl3 2. Is the above a synthesis, single replacement, combustion, or double replacement reaction? 3. Predict the products of the following reaction: Ca(OH) 2+ Li2 SO4

  3. Agenda • Warm Up/Objective • Quick Review • Quiz • Hot Pack / Cold Pack Laboratory • ExiTicket • HW: STUDY FOR UNIT 7 TEST TUESDAY!

  4. Predicting Products • Review

  5. Quiz! • I will provide: polyatomic ion sheet and activity series • You need: PToE and pencil • No talking until everyone is done! • If you finish early, start working on Unit 7 Review in packet

  6. Hot Pack/ Cold Pack Mini Lab • Grab two baggies for your table. • With a marker label one Baking Soda, the other Yeast. • Fill the Baking Soda baggie with a few drops of Vinegar. Shake. • Fill the Yeast baggies with a few drops of Hydrogen Peroxide. Shake it. DATA/ANALYSIS: Describe in detail what happened in each reaction. • Vinegar & Baking Soda: • Hydrogen Peroxide & yeast:

  7. Vinegar & Baking Soda: HC2H3O2(aq) + NaHCO3(s) + ENERGY NaC2H3O2(aq) + CO2 (g) + H2O(l)

  8. Yeast and Hydrogen Peroxide • H2O2 O2 + H2O + energy • Yeast acts as a catalyst, increasing the rate of reaction • What type of reaction is this?

  9. Consensus Law of Conservation of Energy: What two types of energy have we learned about so far? 3rd Type: Chemical energy = energy stored in chemical bonds • EXOTHERMIC (energy EXits the system) • Thermal energy is released from the system  feels warm or hot CH4 + 2 O2 CO2 + 2 H2O + energy • ENDOTHERMIC (energy goes INTO the system) • Thermal energy from the system is absorbed during the rxn feels cold! HC2H3O2(aq) + NaHCO3(s) + ENERGY NaC2H3O2(aq) + NaCl(aq) + H2O(l)

  10. Practice Endothermic or Exothermic? • 1. Energy from the system is absorbed into the chemical bonds • 2. Energy is a product of the reaction • 3. Energy is a reactant of the reaction • 4. After two reactants are combined, the test tube feels cold to the touch • 5. When exposed to oxygen, the iron in a hot pack oxidizes and releases energy in the form of heat

  11. Happy Turkey Day! Exit Ticket • 2. When a chemical cold pack is activated, it becomes cool to the touch. What is happening in terms of energy? • a. An exothermic reaction is occurring, absorbing cold from its surroundings. • b. An exothermic reaction is occurring, releasing heat to its surroundings. • c. An endothermic reaction is occurring, releasing cold to its surroundings. • d. An endothermic reaction is occurring, absorbing heat from its surroundings.

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