1. CHEMICAL INTERACTIONS
CHAPTER 1
SECTION 2

2. WRITING CHEMICAL EQUATIONS
CHEMICAL EQUATION- A SHORTHAND WAY OF WRITING CHEMICAL REACTIONS USING SYMBOLS
ELEMENTS- ARE REPRESENTED BY 1 OR 2 LETTERS. If one letter- it is always a capitol. If 2 letters- the first is always a capitol and the second is lower case.
Au= gold Ag= silver Na= sodium

3. CHEMICAL FORMULAS
COMPOUNDS- TWO OR MORE ELEMENTS CHEMICALY COMBINED (BONDS) IN A SPECIFIC RATIO
CHEMICAL FORMULA- A “WORD” REPRESENTING A COMPOUND.
CO2 H2O
THE NUMBER TWO IS CALLED A SUBSCRIPT AND TELLS US HOW MANY ATOMS OF EACH ELEMENT IS IN THE COMPOUND.

4. COMPOUNDS MOLECULE= THE SMALLEST PART OF A COMPOUND
ELEMENT= A PURE SUBSTANCE
ATOM= THE SMALLEST PART OF AN ELEMENT
SUBSCRIPT= THE NUMBER OF ATOMS OF AN ELEMENT
COEFICIENT= THE TOTAL NUMBER OF MOLECULES

5. CHEMICAL FORMULA
TURN TO PAGE 25 FIGURE 9
H2O
2H2O

6. STRUCTURE OF AN EQUATION
REACTANTS +REACTANTS= PRODUCT
H2 + O2 YIELDS H2O2

7. CONSERVATION OF MASS
THE TOTAL AMOUNT AND TYPE OF MASS IN THE REACTANTS EQUALS THE TOTAL AMOUNT AND TYPE OF MATTER IN THE PRODUCT.
THE LAW STATES THAT MATTER CANNOT BE CREATED NOR DESTROYED
IF WE BURN A BIG LOG AND END UP WITH A PILE OF ASH DOES THE MASS OF THE REACTANTS = THE MASS OF THE PRODUCTS

8. BALANCING CHEMICAL EQUATIONS
RULE – YOU CAN NEVER CHANGE THE SUBSCRIPT IN A CHEMICAL FORMULA BECAUSE YOU WOULD CHANGE WHAT IT IS. BUT YOU CAN CHANGE THE COEFFICIENT
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9. CLASSIFYING CHEMICAL REACTIONS
SYNTHESIS= TO PUT SIMPLE REACTANTS TOGETHER TO MAKE A MORE COMPLICATED PRODUCT
DECOMPOSITION= TO BREAK DOWN THE REACTANTS INTO SIMPLER PRODUCTS
REPLACEMENT= TO REPLACE ONE OR MORE OF THE REACTANTS WITH ONE OR MORE OF THE PRODUCTS TO MAKE A NEW PRODUCT
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