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  • The food is being burnt!
  • No, actually, we are burning the coal to give us heat.
  • But isn't that bad for the environment? What happens to the coal?
  • Well, we give the coal heat and it reacts with the oxygen in the air...
  • ... Remember when we went camping, we didn't only use wood to make a fire. We used coal because it gives off a lot of fo heat when it is burnt.
  • Combustion reactions occur everywhere around the world in many real-life examples– even grilling at home.
  • Double Displacement Reactions
  • Pb(NO3)2 (aq) + 2NaI (aq) ➜ PbI2 (s) + 2NaNO3 (aq) 
  • Today we will talk about double displacement
  • Sometimes, combustion reactions can be bad for the environment. They always involve the compounds giving off oxygen as a product, as they react with oxygen.
  • Pb(NO3)2 (aq) + 2NaI (aq) ➜ PbI2 (s) + 2NaNO3 (aq) 
  • It is when the positive and negative ions of each reactant switch places right?
  • Coal is compromised mainly of carbon and reacts with oxygen in the air when heated. It is a good source of heat energy. The formula is: C + O2 --> CO2.
  • Pb(NO3)2 (aq) + 2NaI (aq) ➜ PbI2 (s) + 2NaNO3 (aq) 
  • Yes, the anions and cations of the reactants switch places to form two new compounds.
  • Double Displacement reactions are slightly more complex, and include 4 elements.
  • In today's class...
  • Double displacement is also known as metathesis and is when two elements switch places forming new compounds. It occurs often in terms of elements.
  • In this reaction, lead nitrate reacts with sodium iodide to form lead iodide and sodium nitrate. 
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