Balancing+Equations

__**Directions:**__ a) list and define all vocabulary from the chapter b) type at least 4 sample problems with step-by-step directions of how to solve the problem; list the correct answers (if your chapter doesn't have math, there are still problems and concepts we learned.) c) link at least 3 websites for additional resources to help with studying d) develop your own LEQ questions for the section - what did you think were the key points we learned? e) Once your page is done, visit 4 other chapters and answer their LEQ's. (This can be done on a separate piece of paper)

Chemical Reaction: Ex) 4Al+3O2-->2AL2O3 (The numbers in front are Stoichiometic Coefficients)
 * Occurs when the outer most parts of atoms are formed or broken.
 * Involves changes in matter
 * The making of new materials with new properties and energy changes
 * Their job is to depict the kinds of reactions and products and their relative amount in reaction

Types of Reactions: Synthesis: Combining one or more elements or compounds to form a single product Decomposition: A chemical change in which a single compound breaks Single Replacement: A chemical change in which one element replaces another element in a bond Double Replacement: A chemical change involving an exchange of positive ions between compounds (FLOI to FOIL) Combustion: Always forms Co2 and H2O Acid and Base: The neutralizing of an acid with a hydroxide or base

Parts of a Reaction Equation: Steps to Balancing Equations: Check your amswer to see if:
 * Chemical equations show the conversion of reactants
 * The molecules shown to the left of the arrow into the product which is the molecules show to the right of the arrow
 * The arrow is used to read as "yield"
 * Equations must be balanced because of the principle of conservation
 * Equations must have the same number of atomics of the same kind on each side of the equation
 * When balancing an equation you may add a coefficient to the first compound but NOT a compound
 * Changing the subscript changes the equation
 * 1) Write the correct formula then find the type of reaction
 * 2) Find the number of atoms for each element on the left side. Compare those with the number of atoms of the same element on the right side.
 * 3) Determine where to place coefficients in the front of the formulas so that the left side has the same number of atoms on the right side for each element to balance the equation
 * The #'s of the atoms on both sides are balanced (same)
 * The coefficients are in the lowest possible whole number ratios (reduce if need be)
 * if the oxygen and or hydrogen are in the equation balance them after you balance the other elements

Examples: NaL+ CaCl2--> NaCl2 + CaL2 Answer: Double Replacement because there are four elements 2. Balance the equation Answer: 2NaL + 1CaCl2--> 2NaCl2 + 1CaL2 What reaction does Flio to floil use, and how do you use it?
 * 1) Find the type of reaction

How do you check if you have balanced the equation correctly?

What elements do you balance last?

Links:

http://chemistry.about.com/cs/stoichiometry/a/aa042903a.htm

http://chemistry.about.com/od/testsquizzes/a/worksheets.htm

http://members.cox.net/mr.graham/Assignments_files/balancing_equations_worksheet.htm