The Law of Conservation of Mass states that matter can not be created nor destroyed, and this is a fundamental rule that governs how products can form from reactants in a chemical equation.  Today we will be writing some chemical equations and balancing the products and reactants to ensure that the Law of Conservation of Mass has been applied.

Resources:

• Textbook p202-211
• Workbook p74-76
• Notes

Assignment:

• Workbook p77-79 (answer key is attached so you can check your answers)
• Do the worksheet after you have finished the practice.  Have Mr. Yang check your answers with you 
• When you feel you are ready, take the "Balancing Equations" quiz

Things you should know after today:

• vocabulary: chemical reaction, reactants, products, word equation, skeleton equation, balanced equation
• create a skeleton equation from a word equatoin
• create a balanced equation from a skeleton equation by adding coefficients

Extra Practice:

• Do you want some extra practice balancing equations?  Visit http://www.sciencegeek.net/Chemistry/taters/EquationBalancing.htm