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Unformatted text preview: Al2(SO4)3 + ____ H2O 3) Fe3O4 + H2 ® Fe + H2O Fe O H Reactant Products ___Fe3O4 + ___ H2 ® ___ Fe + ___ H2O 4) C4H10 + O2 ® CO2 + H2O C H O Reactant Products ___ C4H10 + ___ O2 ® ___ CO2 + ___ H2O 4 Chemistry 51 Chapter 6 TYPES OF CHEMICAL REACTIONS
· Chemical react ions are classified into five types: 1. Synthesis or Combination ( A + B ® AB ) · Two elements or compound combine to form another compound. 2. Decomposition ( AB ® A + B ) · A co mpound breaks up to form elements or simpler compound. 3. Single Replacement ( A + BC ® B + AC ) · A more reactive element replaces a less reactive element in a co mpound.
· These react ions will be discussed in more detail later in this chapter. 5 Chemistry 51 Chapter 6 TYPES OF CHEMICAL REACTIONS ( AB + CD ® AD + BC ) 4. Double Replacement · Two compounds interact to form two new compounds.
· These react ions will be discussed in more detail later in this chapter. 5. Combustion Reactions:
· A react ion that invo lves oxygen as a reactant and produces large amounts of heat is classified as a combustion react ion. CH4 (g) + 2 O2 (g) ® CO2 (g) + 2 H2O (g) Examples: Classify each of the reactions below: 1. Mg + CuCl2 ® MgCl2 + Cu 2. CaCO3 ® CaO + CO2 3. 2 HCl + Ca(OH)2 ® CaCl2 + H2O 4. C3H8 + 5 O2 ® 3 CO2 + 4 H2O 5. 4 Fe + 3 O2 ® 2 Fe2O3 6 Chemistry 51 Chapter 6 DOUBLE REPLACEMENT REACTIONS
· Double replacement reactions can be subdivided into one of the fo llowing subgroups: 1. Precipitation: In these reactions one of the products formed is an inso luble so lid called a precipitate. For example, when solut ions of potassium chromate,K2CrO4 , and barium nitrate, Ba(NO3)2 , are combined an inso luble salt barium chro mate, BaCrO4 , is formed. K2CrO4 (aq) + Ba(NO3)2 (aq) ® BaCrO4 (s) + 2KNO3 (aq) Precipitate These react ions will be further discussed in Chapter 8 2. Neutralization: The most important reaction of acids and bases is called neutralization. In these reactions an acid combines with a base to form a salt and water. For example: HCl (aq) + Na H (aq ) ¾¾ N Cl (aq) + H 2 O (l) O
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