Summary Types of Chemical Reactions Notes

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