Unit 7 Chemical Reactions Types of Reactions. Type of Reactions Chemical reactions are classified...
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Transcript of Unit 7 Chemical Reactions Types of Reactions. Type of Reactions Chemical reactions are classified...
![Page 1: Unit 7 Chemical Reactions Types of Reactions. Type of Reactions Chemical reactions are classified into five general types.](https://reader035.fdocuments.in/reader035/viewer/2022081504/56649f345503460f94c50cbf/html5/thumbnails/1.jpg)
Unit 7 Chemical Reactions
Types of Reactions
![Page 2: Unit 7 Chemical Reactions Types of Reactions. Type of Reactions Chemical reactions are classified into five general types.](https://reader035.fdocuments.in/reader035/viewer/2022081504/56649f345503460f94c50cbf/html5/thumbnails/2.jpg)
Type of ReactionsChemical reactions are classified into five general types
![Page 3: Unit 7 Chemical Reactions Types of Reactions. Type of Reactions Chemical reactions are classified into five general types.](https://reader035.fdocuments.in/reader035/viewer/2022081504/56649f345503460f94c50cbf/html5/thumbnails/3.jpg)
Synthesis (Combination) Two or more elements or simple compounds combine to form (synthesize) one product
A + B AB2Mg + O2 2MgO
2Na + Cl2 2NaCl
When two elements combine in synthesis, the product is a compound made of their respective ions.
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SynthesisYouTube - Reaction of aluminium with
bromine
![Page 5: Unit 7 Chemical Reactions Types of Reactions. Type of Reactions Chemical reactions are classified into five general types.](https://reader035.fdocuments.in/reader035/viewer/2022081504/56649f345503460f94c50cbf/html5/thumbnails/5.jpg)
Synthesis (practice)• Predict the products. Write and balance
the following synthesis reaction equations.• Sodium metal reacts with chlorine gas Na(s) + Cl2(g) • Solid Magnesium reacts with fluorine gas Mg(s) + F2(g) • Aluminum metal reacts with fluorine gas Al(s) + F2(g)
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DecompositionOne substance is broken down (split) into two or more simpler substances.
AB A + B
2HgO 2Hg + O2
2KClO3 2KCl + 3 O2
a compound made of two elements, decomposes into those elements.
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Decomposition
![Page 8: Unit 7 Chemical Reactions Types of Reactions. Type of Reactions Chemical reactions are classified into five general types.](https://reader035.fdocuments.in/reader035/viewer/2022081504/56649f345503460f94c50cbf/html5/thumbnails/8.jpg)
Decomposition Practice•Predict the products. Then, write
and balance the following decomposition reaction equations:
•Solid Lead (IV) oxide decomposes PbO2(s)
•Aluminum nitride decomposes AlN(s)
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Learning Check 1Classify the following reactions as 1) synthesis or 2) decomposition:
___A. H2 + Br2 2HBr
___B. Al2(CO3)3 Al2O3 + 3CO2
___C. 4 Al + 3C Al4C3
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CombustionA reaction in which a hydrocarbon (compound made up of H and C) reacts with oxygen and the products are carbon dioxide and water
CH4 + 2O2 CO2 + 2H2O
C3H8 + 5O2 3CO2 + 4H2O
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Combustion PracticeComplete and Balance the combustion
equation
___C5H12 + ___O2
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Single Replacement (Displacement)One element takes the place of an element in a reacting compound.
A + BC AC + B
Zn + 2HCl ZnCl2 + H2
Fe + CuSO4 FeSO4 +
Cu
A metal can replace a metal (+) OR a nonmetal
can replace a nonmetal (-).
Depends on the relative reactivity's of the two
metals.
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Single Replacement (Displacement) Practice
YouTube - Thermite reaction
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Single Replacement Displacement)
The activity series of metals lists metals in order of decreasing reactivity.
A metal will replace any metal listed below.
Lithium
Potassium
Calcium
Sodium
Magnesium
Aluminum
Zinc
Iron
Lead
Hydrogen
Copper
Mercury
silver
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Single Replacement (Displacement) Practice
•Sodium chloride solid reacts with fluorine gas
NaCl(s) + F2(g)
•Aluminum metal reacts with aqueous copper (II) nitrate
Al(s)+ Cu(NO3)2(aq)
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Double Replacement (Displacement)
Two elements in reactants take the place of each other
AB + CD AD + CB
AgNO3 + NaCl AgCl +
NaNO3
ZnS + 2HCl ZnCl2 +
H2S
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Double Replacement (Displacement)
YouTube - Double Replacement Reactions
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• Think about it like “foil”ing in algebra, first and last ions go together ; inside ions go together
• Example:
AgNO3(aq) + NaCl(s) AgCl(s) + NaNO3(aq)
• Another example:
K2SO4(aq) + Ba(NO3)2(aq) KNO3(aq) + BaSO4(s)
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Classify the following reactions as 1) single replacement 2) double replacement
__A. 2Al + 3H2SO4 Al2(SO4)3 + 3H2
__B. Na2SO4 + 2AgNO3 Ag2SO4 + 2NaNO3
__C. 3C + Fe2O3 2Fe + 3CO
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Double Replacement Practice
• Predict the products. Balance the equation
1. HCl(aq) + AgNO3(aq)
2. CaCl2(aq) + Na3PO4(aq)
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Unit 8 Chemical Reactions
Types of Reactions