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Chemical Reactions T. Trimpe http://sciencespot.net/

Watch the movie and then complete the chart. Two or more elements or compounds combine to make a more complex substance A + B → AB AB → A + B Compounds break down into simpler substances Occurs when one element replaces another one in a compound AB + C → AC + B AB + CD → AC + BD Occurs when different atoms in two different compounds trade places A = Red B = Blue C = Green D = Yellow

Watch the movie and then complete the chart. A = Red B = Blue C = Green D = Yellow

Chemical Reactions T. Trimpe http://sciencespot.net/

Identifying Chemical Reactions 2. Use colored pencils to circle the common atoms or compounds in each equation to help you determine the type of reaction it illustrates. Use the code below to classify each reaction. S = Synthesis D = Decomposition SR = Single Replacement DR = Double Replacement ____ P + O2 → P4O10 ____ Mg + O2 → MgO ____ HgO → Hg + O2 ____ Al2O3 → Al + O2 ____ Cl2 + NaBr → NaCl + Br2 ____ H2 + N2 → NH3

____ Na + Br2 → NaBr ____ CuCl2 + H2S → CuS + HCl ____ HgO + Cl2 → HgCl + O2 ____ C + H2 → CH4 ____ KClO3 → KCl + O2 ____ S8 + F2 → SF6 ____ BaCl2 + Na2 SO4 → NaCl + BaSO4

Balancing Act T. Trimpe http://sciencespot.net/

Basics to Chemical Equations Atoms are not __________ or _______ during a chemical reaction. Scientists know that there must be the ______ number of atoms on each _________ of the _____________. To balance the chemical equation, you must add _______________ in front of the chemical formulas in the equation. You cannot _______ or ___________ subscripts! destroyed created same side equation Coefficients remove add

Video • http://www.youtube.com/watch?v=z4rXO533deI

Video Continued… ____ CH4 + ___O2 -> ___ CO2 + ___H2O Atoms: ___ C -> ___ C ___ H -> ___ H ___ O -> ___ O 2 2 1 1 2 4 4 2 4 3 4

Example in your packet 2 2 1 2 1 2 2 1 2

More examples in your packet

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