Types of chemical reactions

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  • 1. Agenda • Bonding Practice Bell Work • Show the Lewis dot structure of sodium and chlorine. • Notes: Types of Chemical • Draw arrows representing the movement of electrons. What will Reactions the formula be? • Chemical Reactions Practice • Draw the Lewis dot of two iodine. • Test tomorrow • Circle the electrons that will form bonds. What will the formula be?
  • 2. CHEMICAL REACTIONS Reactants: Zn + I2 Product: Zn I2
  • 3. Types of Reactions • There are five types of chemical reactions we will talk about: 1. 2. 3. 4. 5. • Synthesis reactions Decomposition reactions Single displacement reactions Double Replacement reactions Combustion reactions You need to be able to identify the type of reaction
  • 4. 1. Synthesis reactions • Synthesis reactions occur when two elements combine and form a compound • reactant + reactant  1 product • Basically: A + B  AB • Example: 2H2 + O2  2H2O
  • 5. 2. Decomposition Reactions • Decomposition reactions occur when a compound breaks up into a few simpler compounds • 1 Reactant  Product + Product • In general: AB  A + B • Example: 2 HgO  2Hg + O2
  • 6. 3. Single Replacement Reactions • Single Replacement Reactions occur when one element replaces another in a compound. • Metal replaces metal OR nonmetal replaces nonmetal • element + compound product + product A + BC  AC + B A + BC  BA + C
  • 7. 4.Double Replacement Reactions • Think about it like “foil”ing in algebra, first and last ions go together + inside ions go together • Metal replaces metal and nonmetal replaces nonmetal • Example: AgNO3(aq) + NaCl(s)  AgCl(s) + NaNO3(aq)
  • 8. 5. Combustion Reactions • Combustion reactions occur when a hydrocarbon reacts with oxygen gas. • 1) A Fuel (hydrocarbon) 2) Oxygen to burn it with 3) Something to ignite the reaction (spark) • In general: CxHy + O2  CO2 + H2O
  • 9. Things to know Sulfuric Acid – H2SO4 Sulfate – SO4 Hydroxide - OH Nitrate – NO3
  • 10. Things to know Sulfuric Acid – H2SO4 Sulfate – SO4 Hydroxide - OH Nitrate – NO3