1. Bellringer 3. 12. 2013 Balance the following equations: 1. ____ C + _____H 2 →_____ CH 4 2. ___ Na +____ Br 2 → ___NaBr

2. Test: Thursday 3.14 Review: Evidence a chemical reaction has taken place Reactants vs products Coefficients, subscripts, etc. 4 types of chemical reactions Balancing chemical equations

3. Evidence of chemical reaction Precipitate is formed: a solid that forms as a result of chemical reaction Color change Gas is produced: bubbles form Odor

4. Type of Reaction Definition  Equation Synthesis Decomposition Single Replacement Double Replacement TYPES OF CHEMICAL REACTIONS: A = Red B = Blue C = Green D = Yellow A + B → AB AB → A + B AB + C → AC + B AB + CD → AC + BD Two or more elements or compounds combine to make a more complex substance Compounds break down into simpler substances Occurs when one element replaces another one in a compound Occurs when different atoms in two different compounds trade places

5. Identifying Chemical Reactions 1. ____ P + O 2 → P 4 O 10 2. ____ BaCl 2 + Na 2 SO 4 → NaCl + BaSO 4 3. ____ Al 2 O 3 → Al + O 2 4. ____ Cl 2 + NaBr → NaCl + Br 2 S = Synthesis D = Decomposition SR = Single Replacement DR = Double Replacement

6. Balancing Equations ____ C + _____H2 →_____ CH4 Use coefficients, can’t change subscripts Reactants Products