Chemical Reactions

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Chemical Reactions

• Science, Technology, and Society
• Mr. CANOVA PERIOD 11

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How to Make a Cake

• 1. Add flour and eggs and milk, put in the oven
  for 20 minutes at 450oF and you will have
  yourself a cake.
• 2. Flour(s) eggs(s) milk(l) ? cake(s)

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• Word Equation uses names of the
• reactants and products.
• Ex aluminum plus copper (II) chloride yields
• aluminum chloride and copper
• Skeleton Equation uses chemical
• symbols with no relative amounts.
• Ex Al(s) CuCl2(aq) ? AlCl3(aq) Cu(s)

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NOTE!!!!!!!

• Make sure compounds are written properly.
• Remember to put up the charges and use
  criss-cross method if needed.
• Remember diatomic molecules.

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• 3. Phases
• s - solid phase
• l - liquid phase
• g - gaseous phase
• aq aqueous phase
• (exists in a water solution)
• EX NaCl(aq) solid NaCl dissolved in H2O

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NOTE!!!!!!!

• Balanced Formula Equation shows
• the relative amounts of the atoms
• on each side of the equation.
• EX 2Al(s) 3CuCl2(aq)? 2AlCl3(aq) 3Cu(s)
• LAW OF CONSERVATION OF MATTER
• To balance equations use ONLY coefficients.
• NEVER, NEVER change a subscript

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Balancing Reactions
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Types of Reactions

1. Combination (Synthesis)
2. Decomposition
3. Single Replacement
4. Double Replacement
5. Combustion

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• 1. Combination (Synthesis)
• Ex A B ? AB
• Ex 2H2 O2 ? 2H2O
• 2. Decomposition
• Ex AB ? A B
• Ex 2H2O ? 2H2 O2
• (electrolysis)

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• 3. Single Replacement
• Ex A BC ? C BA
• Ex Zn Cu(NO3)2 ? ?
• Like replaces like USE ACTIVITY SERIES
• Is Zn higher than Cu on the list?

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Activity Series of Metals

• Use for single replacement Reactions
• Li K Ba Sr Ca Na
  Mg Al Mn Zn Zn
  Cu(NO3)2 ? Zn(NO3)2 Cu Fe Cd Co Ni
  Sn Pb H Cu Ag Hg Au

Decreasing Activity
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• 4. Double Replacement
• Ex AB CD ? AD CB
• Ex HCl NaOH ? H(OH) NaCl
• 5. Combustion
• Ex hydrocarbon O2 ? CO2 H2O
• Ex CH4 2O2 ? CO2 2H2O
• This is an example of complete combustion.

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