1. DESCRIBING CHEMICAL REACTIONS

2. CHEMICAL REACTIONS
One or more substances changes into different substances.

3. CHEMICAL REACTION EQUATIONS
Word Equations:
Names of chemicals are written out in full.
Chemical Equations:
Chemical formulas are used to represent the chemicals.

4. PARTS OF REACTION EQUATIONS
Reactants:
Substances that are used up during a reaction.
Potassium

5. PARTS OF REACTION EQUATIONS
Products:
Substances that are produced during the reaction.
Potassium and Water!

6. CHEMICAL REACTION RESULTS
Chemical reactions can either absorb or release energy.
included in equation.

7. CHEMICAL EQUATIONS
Reactants Yields Products
? ? ?

8. iron + sulfur iron (II) sulfide + energy
EQUATIONS
Word Equation:
iron + sulfur iron (II) sulfide + energy
Chemical Equation:
Fe + S FeS energy

9. EQUATION GUIDELINES
An arrow indicates the direction of the chemical reaction.
Substances on the left are reactants.
Substances on the right are products.
Usually very difficult to have the reaction proceed the other way

10. EQUATION GUIDELINES
State Symbols:
Indicates the state or form of each substance
Ex. (s) means solid
(g) means gaseous
(aq) means dissolved in
water

11. EXAMPLES Zinc + copper sulfate zinc sulfate + copper + energy
Zn(s) + CuSO4(aq) ZnSO4 (aq) + Cu(s) + energy

12. VOCABULARY
Chemical reaction
Word equation
Chemical equation
Reactants
Products
State Symbols

13. Pg 227 # 1-9