Chemical Reactions

• What is a Chemical Reaction???

  
  

  A process where new, different substances are made.
• What is a physical process???

  A process where no new substances are made
• What are the three steps of a chemical reaction???

  1. Reactant bonds break
  2. Atoms rearrange
  3. Product bonds form
• What are the three observations of a chemical reaction???

  1. Color change
  2. Gas producing ( fizzing )
  3. Temperature change
• How can amount of gas produced in a chemical reaction be measured???

  A gas syringe
• How are chemical reactions represented???

  Word Equations
• Where can the reactants be found in a word equation???

  On the left of the ← 
• Where can products be found in a word equation???

  On the right of the →
• Why is an → used in a word equation???

  To show a chemical reaction / chemical change is taking place
• What is the law of conservation of mass???

  Matter cannot be created or destroyed
• How is the law of conservation of mass applied to chemical reactions???

  Mass of reactants = mass of products
• What is complete combustion???

  When a substance combusts (burns) with sufficient oxygen
• State the word equation for he complete combustion of fuel???

  Fuel + Oxygen → Carbon Dioxide + Water
• What is incomplete combustion???

  When a substance combusts with limited oxygen
• State the word equation for the incomplete combustion of fuel???

  Fuel + Oxygen → Carbon Monoxide + Water + Carbon
• What are the three components of the fire triangle???

  Fuel, Oxygen, Heat
• What is thermal decomposition???

  A chemical reaction where a compound breaks down when exposed to heat
• How many reactants are there in a thermal decomposition reaction???

  One
• What is energy???

  Ability of an object to make something happen
• What is the unit of energy???

  Joules
• Which process in a chemical reaction requires energy???

  Breaking of reactant bonds
• Which process in a chemical reaction releases energy???

  Making of product bonds
• Why are some chemical reactions exothermic overall???

  More energy is released when making product bonds than taken in when breaking reactant bonds
• Why are some chemical reaction endothermic???

  More energy is taken in to break reactant bonds than released when making product bonds
• What is the risk associated with an acid???

  Corrosive to skin / eyes