2. What are Chemical Reactions? When a chemical change takes place, a chemical reaction occurs.

3. Why do Reactions take place? Chemical reactions take place to make atoms more stable.

4. What is a Chemical Equation? A representation of a chemical reaction where the reactants and products are expressed as formulas. Reactants → Products

5. Reactant The substances that undergo change in a Chemical Reaction. Product The new substances that are a result of a Chemical Reactions.

6. Synthesis Reactions A reaction where two or more substances react to form a single substance. Reactants may be either elements or compounds. Product synthesized is always a compound. The general equation for a Synthesis Reaction is: A+B → AB Ex. Sugar+Water = Sugar Water

7. Where a compound breaks down into two or more simpler substances Reactant is always a compound. Products may be elements or compounds. The general equation for a Decomposition Reaction is: AB → A+B Ex. Oreo=Chocolate Cookie+ Cream

8. A reaction in which one element takes the place of another element in a compound. A+BC → B+AC Ex. Burger+Fries&Drink= Fries+Burger& Drink

9. A reaction in which two different compounds exchange positive ions and form new compounds. AB+CD → AD+CB For Example: CaCO з +2HCl → CaCl 2 +H 2 CO з