Types of chemical Reactions (3a)
1. A chemical reaction is a process that changes one set of chemicals into another set of
chemicals
● Ex: CaCO3 + HCl H2CO3 + CaCl
2. The chemicals to the left side of a chemical reaction are called the reactants
3. The chemicals to the right side of the chemical reaction are called the products
(produces something new)
4. Chemical reactions cause chemical changes, something NEW is created
5. Signs that chemical reactions have occurred include:
● light
● heat/cold
● gas
● color change
● smell
● participate (solid)
6. The four main types of chemical reactions are:
● synthesis
● decomposition
● single replacement
● double replacement
7. In a synthesis reaction, two or more substances react to form a single product.
Ex: A + B → AB
► Example: Na + Cl NaCl
8. In a decomposition reaction, a single compound breaks down to form two or more
simpler substances. Ex: AB → A + B
► Example: 2NaCl 2Na + Cl2
9. In a single replacement reaction, one element replaces a second element in a compound.
Ex: AB + C → AC + B
► Example: 2HCl + Mg MgCl2 + H2
10. In a double replacement reaction between two compounds, the positive ion of one
compound is exchanged with the positive ion of another compound.
Ex: AB + CD → AD + CB
► Example: HCl + AgNO2 2HNO3+ AgCl
1. A chemical reaction is a process that changes one set of chemicals into another set of
chemicals
● Ex: CaCO3 + HCl H2CO3 + CaCl
2. The chemicals to the left side of a chemical reaction are called the reactants
3. The chemicals to the right side of the chemical reaction are called the products
(produces something new)
4. Chemical reactions cause chemical changes, something NEW is created
5. Signs that chemical reactions have occurred include:
● light
● heat/cold
● gas
● color change
● smell
● participate (solid)
6. The four main types of chemical reactions are:
● synthesis
● decomposition
● single replacement
● double replacement
7. In a synthesis reaction, two or more substances react to form a single product.
Ex: A + B → AB
► Example: Na + Cl NaCl
8. In a decomposition reaction, a single compound breaks down to form two or more
simpler substances. Ex: AB → A + B
► Example: 2NaCl 2Na + Cl2
9. In a single replacement reaction, one element replaces a second element in a compound.
Ex: AB + C → AC + B
► Example: 2HCl + Mg MgCl2 + H2
10. In a double replacement reaction between two compounds, the positive ion of one
compound is exchanged with the positive ion of another compound.
Ex: AB + CD → AD + CB
► Example: HCl + AgNO2 2HNO3+ AgCl
