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Chemical reaction where two compounds react, and the positive ions  and the negative ions of the two reactants switch places
Format: AB+CD-- AC+BD
Analogy: Mix matching socks
Example 1: H2O+MgN---H2Mg+ON
Example 2: KO+AgBr---KAg+OBr

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It is when an element reacts with a compound and takes the place of another element in that compound
Format: A+BC--AC+B
Analogy: Single replacement is like getting cheated on.
Example 1: Zn+2HCl---ZnCl2+H2
Example 2:Br2+2Kl---2KBr+l2

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The rapid chemical combination of a substance with oxygen, involving the production of heat and light.
Format: CxHy+O2--CO2+H2O
Analogy: A fire pile is similar to Combustion.
Example 1 : CH4+O2--CO2+H2O
Example 2: C4H10+O2---CO2+H2O

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When a substance decays from its original form
Format: AB=A+B
Analogy:Decomposition reaction is similar to a married couple getting divorced.
Example 1: Calcium oxide, lime (CaCo3(s))--CaO(S)+CO2)
Example 2:Ammonium Nitrate(NH4NO3--N2O+2H2O)

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2 or more substances combine to form a new substance
Format:A + B=AB
Analogy: Synthesis reaction is similar to a peanut butter and jelly sandwich.
Example 1: Sodium mixing with Chloride (forms Sodium Chloride, salt, NaCl)
Example 2: Hydrogen mixing with Oxygen (forms water, H2O)