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Types of Reactions. What you need to know for the A.P. Chemistry Exam. Five Types of Reactions ( First Year Chemistry ). Direct combination reaction (synthesis) A + B  AB A single product is formed from two or more reactants Decomposition Reaction AB  A + B

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Types of reactions

Types of Reactions

What you need to know for the A.P. Chemistry Exam


Five types of reactions first year chemistry
Five Types of Reactions (First Year Chemistry)

  • Direct combination reaction (synthesis)

    A + B  AB

    • A single product is formed from two or more reactants

  • Decomposition Reaction

    AB  A + B

    • The reverse of a synthesis reaction. One reactant breaks into two or more products.

      YouTube - Elephant toothpaste


Five general types of reactions
Five General Types of Reactions

  • Single Replacement Reaction

    A + BX  AX + B

    • A single element (A) replaces another element (B) in a compound

    • A single element must be more reactive to replace another element.

      • Use the Activity Series!


Five general types of reactions1
Five General Types of Reactions

  • Double Replacement Reaction

    AX + BY  AY + BX

    • Two compounds switch partners and form two new compounds.

  • Combustion Reactions

    • O2 gas reacts with a flammable carbon compound to produce CO2 and H2O

      C2H5OH + 3 O2 2 CO2 + 3 H2O


  • What you need to know
    What you need to know!

    • The AP chemistry exam includes combustion reactions with organic molecules. Thus knowing the formula for a given organic molecule will help you write and balance the equation.


    Hydrolysis reactions
    Hydrolysis Reactions

    • A reaction where water is one of the reactants, and a larger molecule is split into two smaller molecules, one of which has the hydrogen from the water and the other has the OH group from the water.

    • A specific case of the hydrolysis of an amide is the hydrolysis of peptides to smaller fragments or amino acids.


    Examples of chemical reactions
    Examples of Chemical Reactions

    • Chemical volcano – YouTube

    • Reaction of iron with sulfur – YouTube

    • Elephant toothpaste – YouTube

    • Fire It Up - Combustion Reactions – YouTube

    • Double Replacement with Precipitates - YouTube


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