Chemical Reaction

• Chemical Reaction - is a process in which properties of the original subtances change into new subtances with different physical and chemical properties
• Examples of chemical reaction:

  • Fireworks
  • Posporo
  • Process on stomac
• EVIDENCES:

  1. Change of color
  2. Formation of gas
  3. Temperature change
  4. Change in smell
  5. Formation of precipitate
• Reactant - enter a chemical reaction
• Product - produce in a chemical reaction
• Law conservition of mass - the total mass of the reactants must be equal to the total mass of the products
• Chemical equation is written as A + B → C + D
• Combination Reaction - occurs when two or more subtances (reactants) combined to form a compound (products)

  • GENERAL FORMULA: A + B -> AB
• Decomposition reaction - occurs when a single compounds breaks down into two or more simpler products

  • GENERAL FORMULA: AB -> A + B
• Single displacement - one elements replace another element in a compound

  • GENERAL FORMULA: AB + X -> AX + B
• Double displacement - this involes exchanging of ions to form new compounds

  • GENERAL FORMULA: AB + XY -> AX + BY