1. 12/8 - 8 th Grade Agenda Learning Objective: Learn about Fire Safety Collect HW: Reading & Notetaking: p.117 – 118 Textbook Reading p. 237-245 HW: Reading & Notetaking p.119 – 122 Reminder HW: Science Fair Background due 1/14 & 1/15 (10 Points)

2. Daily Reflection Prompt: What is the difference between an exothermic and endothermic reaction?

3. What is Conservation of Mass? The total mass of the reactant must equal the total mass of the products During a chemical reaction, matter is not created or destroyed

4. Open End vs Closed End systems

5. What is a coefficient 2 H 2 + O 2  2 H 2 O The number in front of a chemical formula in a chemical is called an coefficient It tells you how many molecules or atoms of each reactant or product take part in the reaction

6. What is a Chemical Equation Reactant + Reactant  Product + Product H 2 + O 2  H 2 O 2 Subscript shows the number of atoms of an element in a molecule

7. Balancing Equation

8. Types of Chemical Reactions What is a Synthesis? When two or more substances (elements or compounds) combine to make a more complex substance, the process is called a synthesis

9. Types of Chemical Reactions What is Decomposition? Decomposition reaction breaks down compounds into simpler products

10. What is a Replacement reaction? It is similar to a girl switching boyfriends A reaction in which one element replaces another in a compound

11. What is an activation energy? The minimum amount of energy that has to be added to start a reaction. Think of a chemical reaction as being like a rock resting behind a ridge at the top of a hill.

12. Energy in Chemical Reactions Every chemical reaction involves a change of energy. (In the test)

13. What affects the rate of chemical reactions? Concentration Surface Area Temperature Catalysts

14. What is a Catalyst? A Material that increases the rate of a chemical reaction by lowering the activation energy What does it mean?

15. Catalyst Demonstration Paper clips represents reactants If I place two paper clips in a cup, no matter how hard I shake the cup, I can not get the paper clips to link up.

16. Catalyst Demonstration In this model, Paper clip = Reactant Dollar bill = Catalyst

17. Another Catalyst Demonstration Hydrogen Peroxide decomposes into Water and Oxygen slowly 2H 2 O 2 -> 2H 2 O + O 2 Yeast acts as a Catalyst and speeds up the reaction.

18. What is an enzyme or catalyst? Enzyme is biological catalyst which provide a surface on which reactions take place. This helps reactions happen at lower temperatures because it lowers activation energy.

19. What is combustion? Combustion is a rapid reaction between oxygen and a substance called a fuel.

20. What are the three things necessary to start and maintain a fire? Fuel Oxygen Heat

21. What are four common sources of fires at home? Small heaters Fires in the kitchen Faulty electric wiring Carelessness with cigarettes.

22. How can you fight a fire? A. Blow air on it? B. Cover it with baking soda? C. Use a fire extinguisher? D. Pour water on it?

23. Which of the following is a safety aid in a fire safe home. A) smoke detectors B) gasoline can in the basement C) Fire extinguishers D) Box of baking soda in the kitchen