Chemical Reaction

• Chemical Reactions 


  it is the COMBINATION OF TWO OR MORE ELEMENTS bonded together to make a new substance.
• Chemical Equations 


  it is the REPRESENTATION of a chemical reaction expressed as a formula.
• Subscripts


  it only refer to the ATOM THAT THEY ARE BEHIND.
• Coefficients 


  APPLY TO THE ENTIRE COMPOUND. You multiply the coefficients and subscripts.
• Parenthesis 


  If the elements or compounds are inside of parenthesis, then the subscripts behind the parenthesis APPLIES TO EVERYTHING INSIDE.
• Chemical Reaction


  The kind of matter changes and at least ONE NEW SUBSTANCE WITH NEW PROPERTIES IS FORMED.
• Physical Change 


  The appearance/form of the matter changes but the KIND OF MATTER IN THE SUBSTANCE DOES NOT CHANGE.
• Law of Conservation of Mass 


  —can be created/destroyed

  —rearrange in space
• Reactants 


  We need to have a change
• Products 


  What it produced
• these are the ways in writing a chemical reaction:

  1. Sentence form
  2. Word Equation
  3. Chemical Equation
• Because of the principle of the Conservation of Matter, an equation must be balanced.
• Word Equation 


  describes chemical change using the names of the reactants and change.

  ex. Potassium Hydroxide + Sulfuric Acid —> Potassium Sulfate + Water
• Sentence Form 


  ex. Aluminum Hydroxide reacts Magnesium producing Aluminum and Magnesium Hydroxide. in what form it is written?
• Chemical Equation 


  Al(OH)3 + Mg —> Al + 3Mg(OH)2

  in what form it is written?