QOTD What do you think of when you hear the word “reaction”. Which families of elements are the most reactive? What do you think is the end result of a chemical reaction?

parts are mixed together to make something new Chemical Reaction parts are mixed together to make something new

Types of Reactions Synthesis reactions Double displacement reactions Decomposition reactions Single displacement reactions Double displacement reactions

1. Synthesis Example C + O2 O C +  O C General: A + B  AB

Ex. Synthesis Reaction

Synthesis = join together Predict the products. Na(s) + Cl2(g)  Mg(s) + F2(g)  Al(s) + F2(g)  2 2 NaCl(s) MgF2(s) 2 3 2 AlF3(s) Synthesis = join together

2. Decomposition Example: NaCl  Cl Na Cl + Na General: AB  A + B

Ex. Decomposition Reaction

Decomposition = split apart Predict the products. HgO  2KClO3  2 Hg2 + O2 2KCl + 3O2 Decomposition = split apart

3. Single Displacement General: AB + C  AC + B Example: Zn + CuCl2 

Ex. Single Replacement Reaction

Single Replacement Reactions Predict the products. Cl2 + 2NaBr  2NaCl + Br2 C A B A C B 2HgO + Cl2  2HgCl + O2

4. Double displacement General: AB + CD  AD + CB Example: MgO + CaS 

Double Replacement Reactions Predict the products. CuCl2 + H2S  CuS + 2HCl BaCl2 + Na2SO4  2NaCl + BaSO4

Synthesis Decomposition Single Replacement Double Replacement join together A + B  AB split apart AB  A + B Single Replacement Double Replacement trade 1 place AB + C  AC + B trade 2 places AB + CD  AC + BD

Synthesis Decomposition Single Replacement Double Replacement QOTD List the equations for each reaction (ABCD equations) Synthesis Decomposition Single Replacement Double Replacement

Which type of reaction? 4 P + 5 O2  P4O10 Synthesis

Which type of reaction? Cl2 + 2NaBr  2NaCl + Br2 Single Replacement

Double Replacement Which type of reaction? BaCl2 + Na2SO4 2NaCl + BaSO4 Double Replacement

Which type of reaction? 2 HgO + Cl2 2HgCl + O2 Single Replacement

Which type of reaction? 2 Al2O3  4 Al + 3 O2 Decomposition

Which type of reaction? CuCl2 + H2S  CuS + 2HCl Double Replacement

Which type of reaction? 3 H2 + N2  2 NH3 Synthesis

Which type of reaction? 2 HgO  2Hg + O2 Decomposition