I. 5 Main Types of Reactions
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Transcript of I. 5 Main Types of Reactions
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2 substances combine to form a compound.Example:4Fe + 3O2 2Fe2O3
2 reactants 1 product
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A COMPOUND BREAKS DOWN INTO 2 OR MORE SIMPLER SUBSTANCES
NH4NO3 N2O + H2O1 reactant More than 1
product
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Rxn where 1 element takes the place of another
ExampleFe + CuSO4 FeSO4 + Cu
Element, compoundElement, compound
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Rxn where the + portion of 2 ionic compounds are interchanged
Example:Pb(NO3) 2 + 2KI KNO3 + PbI2
compound, compound compound, compound
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Rxn where a substance rapidly combines with Oxygen to form 1 or more oxides
Example:2C2H2 + 5O2 4CO2 + 2H2O + Energy
O is a reactant
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1. Can change direction2. Equilibrium – rxn that
automatically reverses & there is no overall change in the amount of products or reactants.
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3. Example:CaCO3(s) CaO(s) + CO2 (g)
limestone lime
4. The double arrow shows that the rxn can go either way.
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5. Equilibrium can “disturbed” in order to increase the yield of desired product in a rxn.Example:CaCO3 CaO + CO2
a. If you take out the CO2 the rxn will shift right to produce more lime
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b. Adding E can push a rxn to the left or right.1. Example:3C + 2Al2O3(s) + E 4Al + 3CO2
(g) Endo to the right Exo to the leftWhen you add more E, more product is formed.2. Example:N2 + H2 NH3 + E
Exo to the right Endo to the leftAdding more E pushes the rxn left
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1. Activation Energy –the amt of E required to make a rxn occur
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1. Raising temps2. Increasing Concentration- amt of a
substance present in a given volumeEx: fanning flames
3. If gases are involved, the rate of rxn can be increased by increasing pressure.
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4. Increasing Surface Area- crushing or breaking substances into smaller pieces increase rxn rates.
5. Add a Catalyst – substance that speeds up the rxn rate without being permanently changed or used up itselfIn the body they are called enzymes
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1. Do the opposite of any way to speed rxns up.
2. Inhibitor – slows a rxn without participating