Types of chemical reactions
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What is a chemical reaction?
When 1+ reactants becaome 1+ new products
What are the 5 main types of chemical reactions?
Synthesis (Combination), Decomposition, Single Displacement (Replacement), Double Displacement (Replacement), Combustion.
What is a synthesis reaction?
A reaction where two or more substances combine to form one product. General Formula: A + B → AB Example: 2H₂ + O₂ → 2H₂O
What is a decomposition reaction?
A reaction where one compound breaks down into two or more simpler substances. General Formula: AB → A + B Example: 2H₂O → 2H₂ + O₂
What is a single displacement (replacement) reaction?
A reaction where one element replaces another in a compound. General Formula: A + BC → AC + B Example: Zn + CuSO₄ → ZnSO₄ + Cu
What is a double displacement (replacement) reaction?
A reaction where two compounds exchange ions to form two new compounds. General Formula: AB + CD → AD + CB Example: NaCl + AgNO₃ → NaNO₃ + AgCl
What is a combustion reaction?
A reaction where a substance reacts with oxygen to produce heat and light, usually forming CO₂ and H₂O. General Formula (for hydrocarbons): CxHy + O₂ → CO₂ + H₂O Example: CH₄ + 2O₂ → CO₂ + 2H₂O
How can you identify a combustion reaction?
It always involves oxygen (O₂) as a reactant and produces carbon dioxide (CO₂) and water (H₂O), along with heat/light.
What is the difference between single and double displacement?
In single displacement, one element replaces another. In double displacement, two compounds exchange ions to form new compounds.
Why are chemical reactions classified?
To better understand, predict, and balance chemical equations based on patterns of reactivity.