1. Chemical Reactions
Section 6.1

2. Chemical reactions
A chemical reaction is when one or more substances change into different substances.
Example
iron + sulfur  iron (ii) sulfide + energy

3. Go to textbook Page 225
Read page 225 and write definitions for the following into your notes.
Chemical Reaction
Word Equation
Chemical Equation
Reactant
Product

4. Writing Chemical Equations
Reactants on the left
Products on the right
Arrow indicates direction in which chemical reaction going (from reactants to products)
Can be read as “yields” “forms” or ”produces”
+ signs are placed between reactants if several reactants are included
+ signs are placed between products if several products are created

5. Word Equations Example…… Word Equation
Energy + copper (II) carbonate  carbon dioxide + copper (II) oxide

6. Chemical Equation Energy + CuSO3 (s)  CO2 (g) + CuO (s) State Symbol
Meaning
(s)
solid
(l)
liquid
(g)
gaseous
(aq)
aqueous (dissolved in water)

7. Example
Reaction  A piece of zinc metal is placed in a solution of copper sulfate, a fuzzy reddish-brown coating forms on the zinc.
Word Equation
Zinc + copper sulfate  zinc sulfate + copper + energy
Chemical Equation
Zn (s) + CuSO4 (aq)  ZnSO4 (aq) + Cu(s) + energy
Label the reactants, products, yield/produces sign

8. Practice
Page 227 Questions 2-5