1. 12/4 & 12/5 - 8 th Grade Agenda Learning Objective: Balancing Chemical Equations Collect HW: Reading & Notetaking: p.114 – 116 Collect Signed Grade Printout. Drug Outreach and Education Program Textbook Reading p. 235-239 HW: Reading & Notetaking p.117 – 118 Reminder HW: Science Fair Background due 1/14 & 1/15 (10 Points)

2. Daily Reflection Prompt: Write 3 questions about chemical equations.

3. 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

4. How many atoms are there? Water: H 2 O Carbon Dioxide:CO 2 Carbon Monoxide: CO Methane: CH 4 Propane: C 3 H 8 Sugar: C 12 H 22 O 11 Rubbing alcohol: C 3 H 8 O Ammonia: NH 3 Sodium chloride: NaCl Washing soda: Na 2 CO 3 Baking soda: NaHCO 3.

5. 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

6. Open End vs Closed End systems

7. 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

8. 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

9. Balancing Equation

10. 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

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

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