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Types of Reactions
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Definition
In easy words
Chemical Example
Analogy/Real world example

2. Synthesis: 2 or more simple substances combine to form a more complex substance
2 small things form one big thing
2H2 + O2 2H2O
Quarterback + Wide Receiver Complete Pass
Good Food + Me A Happy Person

3. Decomposition: A more complex substance breaks down into its more simple parts
Something big breaks down into 2 small things
2H2O 2H2 + O2
GloveBall Glove + Ball
Completed Puzzle Puzzle Piece + Puzzle Piece

4. Single Displacement: A single uncombined element replaces another in a compound
A single & a pair on one side switch places to a new single & a new pair
Zn + 2HCl ZnCl2 + H2
DogBone + Steak DogSteak + Bone
CatMouse + Catnip CatCatnip + Mouse

5. Double Displacement Reaction: Reaction parts of 2 compounds switch places to form 2 new compounds
2 more complex substances break apart and combine in a different way to form 2 new substances
Ag(NO3) + NaCl AgCl + Na(NO3)
Boy1Girl1 +Boy2Girl Boy1Girl2 + Boy2Girl1
QBackFootbal +PitcherBaseball QbackBaseball+PitcherFootball

6. Exothermic: A chemical reaction in which energy is released from the reactants; Temperature warms; Energy is on the product side of the reaction
A reaction where heat is released into the environment
Mg + 2H2O Mg(OH)2 + H2 + Heat
Hand Warmers
Thermal Back Stickers =

7. A reaction where heat is sucked into the objects
Endothermic: a chemical reaction in which energy is absorbed by the reactants; temperature of the surroundings decreases; Energy will be on the reactant side
A reaction where heat is sucked into the objects
(NH4)(NO3) + H2O+Heat NH4 + NO3
Ice Pack =

8. Combustion: All substances in a compound are combined with oxygen, which then produces carbon dioxide and water; heat is produced
A reaction where burning is produced
CH4 + 2O2 CO2 + 2H2O + Heat
Gas burned in cars
Gas burned in heating units = O2