CHEMICAL INTERACTIONS CHAPTER 1 SECTION 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

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.

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

CHEMICAL FORMULA TURN TO PAGE 25 FIGURE 9 H2O 2H2O

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

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

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 TURN TO PAGE 28

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 TURN TO PAGE 30