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Reaction Types!

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Five Basic Types of Reactions–Synthesis

–Decomposition

–Single Replacement

–Double Replacement

–Combustion (very special reactions)

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#1 Synthesis Reactions Two or more reactants combine to make

one product

•Chemical Examples!

Cu + O2 CuO

H2 + O2 H2O

•General: A + B AB

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#2 Decomposition Reactions decompose --- “to break down”

one reactant breaks down into two or more simpler products.

Examples:

– NaCl Na + Cl2

– CaCO3 CaO + CO2

General: AB A + B

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#3 Single Replacement One free element replaces another

element in a compound! Analogy- “getting dumped” Examples:– Na + KCl K + NaCl

– Li + Mg(OH)2 Mg + Li(OH) General: A + BC B + AC

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#4 Double Replacement Two elements switch partners. Analogy – Wife Swap Example:

–MgCl2 + NaBr NaCl + MgBr2

– Na(OH) + H2SO4 NaSO4 + H(OH) General: AB + CD AD + CB

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What type are these?? H2 + O2 H2O H2O H2 + O2 Zn + H2(SO4) Zn(SO4) + H2

HgO Hg +O2 KBr +Cl2 KCl + Br2 Ag(NO3) + NaCl AgCl + Na(NO3)

Mg(OH)2 + H2(SO3) Mg(SO3) + H2O

Note: H2O = H(OH)

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#5 Combustion A hydrocarbon (compound composed

of Hydrogen & Carbon) reacts with oxygen (usually from the air)

(Most people call this process Burning!) If combustion is complete,

products will be CO2 and H2O.

If combustion is incomplete,

products will be CO and H2O.

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ExamplesC4H10 + O2 CO2 + H2O

(complete - good!)Balanced or skeletal?2C4H10 + 13O2 8CO2 + 10H2O

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ExamplesC8H8 +O2 CO + H2O

(Incomplete-Bad!)Balanced or skeletal?C8H8 + 6O2 8CO + 4H2O

General: CxHy + O2 CO + H2O

General: CxHy + O2 CO2 + H2O

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Exit Slip Questions

H2 + O2 H2O1. What type of reaction is this?

Synthesis Decomposition Single Replacement Combustion Double Replacement

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Exit Slip Questions

C4H10 + O2 CO2 + H2O2. What type of reaction is this?

Synthesis Decomposition Single Replacement Combustion Double Replacement

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Exit Slip Questions

NaCl Na + Cl2

3. What type of reaction is this? Synthesis Decomposition Single Replacement Combustion Double Replacement

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Exit Slip Questions

Na +KCl K + NaCl4. What type of reaction is this?

Synthesis Decomposition Single Replacement Combustion Double Replacement

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Exit Slip Questions

MgCl2 + NaBr NaCl + MgBr2

5. What type of reaction is this? Synthesis Decomposition Single Replacement Combustion Double Replacement