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.


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


  • 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:

FileDescriptionFile size
Download this file (4.5.workbook.key.pdf)4.5.workbook.key.pdf 665 kB
Download this file (4.5b.notes.pdf)4.5b.notes.pdf 238 kB