5 Types of Chemical Reactions

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5 types of chemical equations

Why do we categorize?To break large groups down into smaller

groups to make them easier to understandTo make differences and similarities more

clear

Type 1: SYNTHESIS

Definition: Two or more reactants combine to form one product

Key sign: One product General Structure: A + B C

Examples: #4: CO + O2 CO3

#2: SO2 + O2 SO4

Type 2: DECOMPOSITION

Definition: One reactant breaks down into two or more products

Key sign: One reactant General Structure: A B + C

Examples: #5: H2CO3 CO2 + H2O #10: NCl3 N2 + Cl2

Type 3: SINGLE REPLACEMENT

Definition: A single element replaces another element in a compound

Key sign: One single element and a compound on both sides of the equation

General Structure: AB + C AC + B Examples:

#13: H2SO4 + Ca CaSO4 + H2

#14: Li + H2O LiOH + H2

Type 4: DOUBLE REPLACEMENT Definition: Two ions replace each other to form two different

compounds Key sign: Two compounds on both sides of the equation General Structure: AB + CD AD + CB

Examples: #3: CaCl2 + K3PO4 Ca3(PO4)2 + KCl #17: Al(SO4)3 + Ca(OH)2 Al(OH)3 + CaSO4

Type 5: COMBUSTION

Definition: A chemical burns in oxygen to product light/heat

Key sign: Oxygen is a reactant, carbon dioxide and water are products (or vice versa)

General Structure: A + O2 CO2 + H2O Examples:

#16: C10H22 + O2 CO2 + H2O #19: CH4 + O2 CO2 + H2O

Categories (15 min) Organize the 19 chemical equations into the FIVE

types with your partners# of products# of reactantsElements vs. compoundsSimilar reactants and products

On one separate sheet of paper with all of your group members names on it, write down the equations in your five groups

Classifying Reactions

Copy down the following reactions on a SEPARATE sheet of paper and then classify the type of reaction and explain your answer.

1. C3H8 + O2 CO2 + H2O2. FeCl3 + NaOH Fe(OH)3 + NaCl3. Ag2O Ag + O2

4. K + MgBr2 KBr + Mg5. H2 + O2 H2O6. NaCl + F2 NaF + Cl2