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Physical Science Ms. Cilli November 29/30, 2011

Describing reactions Part 1. Physical Science Ms. Cilli November 29/30, 2011. Objectives. Interpret chemical equations in terms of reactants, products, and conservation of mass. Balance chemical equations by manipulating coefficients. Chapter Notes/Study Guide.

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Physical Science Ms. Cilli November 29/30, 2011

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  1. Describing reactions Part 1 Physical Science Ms. Cilli November 29/30, 2011

  2. Objectives • Interpret chemical equations in terms of reactants, products, and conservation of mass. • Balance chemical equations by manipulating coefficients. Physical Science pages 192-198

  3. Chapter Notes/Study Guide • Starting this chapter I will be providing you with a basic outline for you to take notes with • Hopefully it will help with retention from class to class and studying for the test • You will need to need to type the notes in the document or print it and write on it • It will be due prior to the test for points

  4. What is happening? Physical or Chemical Change? Physical Science pages 192-198

  5. What are three signs that a chemical reaction is occurring?

  6. Chemical Equations Reactants  Products Reactant is the name we give to the stuff we start out with Product is the name we give to the stuff we end up with Physical Science pages 192-198

  7. Law of Conservation of mass • Mass is neither created nor destroyed in a chemical reaction Physical Science pages 192-198

  8. Conservation of Mass Physical Science pages 192-198

  9. Steps to balancing equations

  10. Example One Cu + O2 -> CuO Reactants Products Cu O Physical Science pages 192-198

  11. Rocket fuel N2H4 + O2 -> N2 + H2O Reactants Products N O H Physical Science pages 192-198

  12. And Another One Na + H2O -> NaOH + H2 Reactants Products Na H O

  13. Practice makes permanant! HCl + CaCO3 -> CaCl2 + CO2 + H2O Reactants Products C Cl Ca O H

  14. Got it?!?! Al + Cl2 -> AlCl3 Reactants Products Al Cl Physical Science pages 192-198

  15. Your Turn • Balance the three equations on the next slide. • You will need to complete one of the equations • Call me in when you are done Physical Science pages 192-198

  16. Zn + HCl ---> ZnCl2 + H2 KClO3 ---> KCl + O2 S8 + F2 ---> SF6

  17. Answers…. Zn + 2HCl ---> ZnCl2 + H2 2KClO3 ---> 2KCl + 3O2 S8 + 24F2 ---> 8SF6

  18. Practice Site • http://www.preparatorychemistry.com/balancing_equations_tutorial.htm • http://education.jlab.org/elementbalancing/index.html

  19. Closure • The substances that are present before a chemical reaction takes place are called _________ . • Reactants • Products • Coefficients • Elements • Which of the following is a balanced equation for the synthesis of NaBr from Na and Br2 ? • Na + Br2 NaBr • 2Na + Br2 NaBr • Na + Br2 2NaBr • 2Na + Br2 2NaBr

  20. T/Th Assignment: MWF • Independent Practice: • Read section 7.1 • Answer the review questions and define the vocabulary words • Homework: • Section 7.1 HW • Due Wednesday, November 30th by 8PM

  21. MWF Assignment: MWF • Independent Practice: • Read section 7.1 • Answer the review questions and define the vocabulary words • Homework: • Section 7.1 HW • Due Thursday, December 1st by 8PM

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