Types of Chemical Reaction

Types of Chemical Reaction

By Rebecca Harper

1. Synthesis Reactions

2. Decomposition

3. Single Replacement

4. Double Replacement

5. Combustion

​There are 5 basic types of chemical reactions determined by the way the atoms rearrange themselves during the chemical reaction.

Multiple Choice

What are the products of the chemical reaction pictured?

• CH₄ and CO₂

• CH₄ and O₂

• CO₂ and H₂O

• O₂ and H₂O

Multiple Choice

Evidence of a chemical reaction include:

• Phase change

• No new substance

• Bubbles forming

• Shape change

Multiple Choice

What are the reactants in the chemical equation pictured?

• CH₄ and CO₂

• CH₄ and O₂

• CO₂ and H₂O

• O₂ and H₂O

Multiple Choice

When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?

• a change of color

• a change of state

• a temperature decrease

• a temperature increase

Synthesis (Combination) Reactions

In a synthesis (or composition) reaction two or more substances combine to form a new compound.

  A   +   X   →    AX

2 Mg(s) + O2(g) → 2 MgO(s)​

Decomposition Reactions

When a single compound undergoes a reaction that produces two or more simpler substances, this is a decomposition reaction.

AB   →   A   +   B

H 2O   →   H2   +   O2​

Combustion Reactions

1. combustion - when a substance combines with oxygen to release large amounts of energy in the form of heat and light

2. occurs during the burning of any fuel or during any explosion

   1. Hydrogen produces water.

   2. Most fuels produce carbon dioxide and water.

​

​Examples:

Organic hydrocarbon:     2C6H6 + 15O2 → 12CO2 + 6H2O

Inorganic: (no carbon):  2Mg + O2 → 2MgO

Hydrogen:                         2H2(g) + O2(g) → 2H2O(g)

Multiple Choice

What type of reaction involves the breaking down of a substance into simpler substances?

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

• Decomposition Reaction

Multiple Choice

What type of reaction involves 2 substances combining to form 1 new compound?

• Decomposition Reaction

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

Multiple Choice

What type of chemical reaction is this one?

Al(OH)₃ --> Al2O3 + H2O

• Decomposition

• Combustion

• Synthesis

• Single Replacement

Multiple Choice

What type of chemical reaction is this one?

CUO + CO2 --> CuCO3

• Decomposition

• Combustion

• Synthesis

• Single Replacement

Multiple Choice

What type of chemical reaction is this one?

C₂H₂ + O₂ --> CO₂ + H₂O

• Decomposition

• Combustion

• Synthesis

• Single Replacement

Multiple Choice

2Na +S → Na₂S

• Double Replacement

• Decomposition

• Combustion

• Synthesis

Single replacement Reactions

single displacement - when one element replaces a similar element in a compound, this is a reaction

  A   +   BX   →   AX   +   B

A + HCl  →  ACl2  + H2​

​

Double replacement Reactions

double displacement - when the ions in two different compounds exchange places and form two new compounds

     AX   +   BY   →   AY   +   BX 

FeS(s) + 2HCl(aq) → H2S(g) + FeCl2(aq) ​​

During double displacement reactions, it is common for one of the products to be a precipitate, or a gas, or water.

Multiple Choice

Identify the following chemical reaction.

2 NaBr + 1 Ca(OH)₂ ----> 1 CaBr₂ + 2 NaOH

• Synthesis (or combination)

• Decomposition

• Single displacement

• Double displacement

Multiple Choice

Identify the following chemical reaction.

Pb + FeSO₄ ----> PbSO₄ + Fe

• Synthesis (or combination)

• Decomposition

• Single displacement

• Double displacement

Multiple Choice

What reaction has the following general formula:

AB + CD --> CB + AD

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

Multiple Choice

Which phrase describes what happens to atoms in a chemical reaction?

• never lost or gained, just rearranged

• sometimes lost, never rearranged

• sometimes lost, gained, or rearranged

• lost or gained, never rearranged

Multiple Choice

What type of chemical reaction is this one?

Ca + MgCl2 --> CaCl2 + Mg

• Decomposition

• Combustion

• Synthesis

• Single Replacement

Multiple Choice

3KOH + H₃PO₄ --> K₃PO₄ + 3H₂O

• Combination

• Decomposition

• Single replacement

• Double replacement

Poll

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