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CLASSIFYING CHEMICAL REACTIONS FIVE BASIC WAYS TO CLASSIFY CHEMICAL REACTIONS: 1.Synthesis 2.Decomposition 3.Single-Replacement 4.Double-Replacement.

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Presentation on theme: "CLASSIFYING CHEMICAL REACTIONS FIVE BASIC WAYS TO CLASSIFY CHEMICAL REACTIONS: 1.Synthesis 2.Decomposition 3.Single-Replacement 4.Double-Replacement."— Presentation transcript:

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2 CLASSIFYING CHEMICAL REACTIONS

3 FIVE BASIC WAYS TO CLASSIFY CHEMICAL REACTIONS: 1.Synthesis 2.Decomposition 3.Single-Replacement 4.Double-Replacement 5.Combustion

4 Synthesis Reactions: Generic Reaction X + Y-->XY Definition-In this equation, X and Y can be compounds or elements. The result XY is a compound. 2 Reactants and 1 Product Analogy- Like a marriage

5 Examples of Real Synthesis Reactions: 2Ba + O 2 -->2BaO 4Cu + O 2 -->2Cu 2 O 2Cu + O 2 -->2CuO 2H 2 + O 2 -->2H 2 O C + O 2 -->CO 2 2Na + Cl 2 -->2NaCl 2

6 Decomposition Reactions: In a decomposition reaction, an compound is broken down into two simpler substances. The generic formula of a decomposition reaction is: XY --> X + Y Decomposition reactions are the opposite of synthesis reactions. 1 Reactant and 2 Products Analogy-Like divorce

7 Examples of Real Decomposition Reactions: 2HgO --> 2Hg + O 2 2H 2 O --> 2H 2 + O 2 CaCO 3 --> CaO + CO 2 Cu(OH) 2 --> CuO + H 2 O 2KClO 3 --> 2KCl + 3O 2 H 2 SO 4 --> SO 3 + H 2 O

8 Single Replacement Reactions: In this type of reaction, one element replaces a similar element in a compound. A + XY --> AY + X In this equation, A, X, and Y are the elements and XY, AY, and XA are the compounds. 1 free element + compound compound + 1 free element Aggressive metal wins Like finding a new girl friend

9 Metal Reactivity Chart Li Rb K Ca Na Mg Al Mn Zn Fe Ni Sn Pb Cu Ag Pt Au H Most aggressive metal (woman) wins out

10 Examples of Single Replacement Reactions: 2Al + 3Fe(NO 3 ) 2 3Fe + 2Al(NO 3 ) 3 Zn + CuCl 2 Mg + Pb(NO 3 ) 2 Fe + Na 3 PO 4 2K + ZnCl 2

11 Examples of Real Single Replacement Reactions: 2Al + 3Fe(NO 3 ) 2 3Fe + 2Al(NO 3 ) 3 Zn + CuCl 2 Cu + ZnCl 2 Mg + Pb(NO 3 ) 2 Pb + Mg (NO 3 ) 2 Fe + Na 3 PO 4 N.R. 2K + ZnCl 2 2 KCl + Zn Cl 2 + 2KBr 2KCl + Br 2

12 Double-Replacement Reactions: In a double-replacement reaction, the two compounds exchange places in a solution to form two new compounds. The general equation of a double- replacement reaction is: AB + XY --> AY + XB 2 compounds Like switching partners in square dancing

13 Examples of Real Double-Replacement Reactions: Pb(NO 3 ) 2 + 2KI --> PbI 2 + 2KNO 3 FeS + 2HCl --> H 2 S + FeCl 2 HCl + NaOH --> NaCl + H 2 O lets take turns dancing with these two beautiful ladies

14 Combustion Reactions: When a substance combines with oxygen releasing a large amount of energy in the form of light and heat, it is a combustion reaction. Oxygen is needed to Burn things. Generic C + O 2 CO 2 + heat

15 Examples of Real Combustion Reactions: examples of combustion reactions C 3 H 8 + 5O 2 --> 3CO 2 + 4H 2 O + heat 2CH 4 + 4O 2 2CO 2 + 4H 2 O + heat

16 FIVE BASIC WAYS TO CLASSIFY CHEMICAL REACTIONS: 1.Synthesis 2 reactants 1 product (like marriage) 2.Decomposition 1 reactant 2 products(like divorce) 3.Single-Replacement( most aggressive element wins) 4.Double-Replacement (switch partners) 5.Combustion =Burning (need oxygen to burn things)


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