Chemistry- REACTIONS

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Sign of Chemical Reaction

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22 Terms
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Sign of Chemical Reaction

-evolution of heat and light -formation of gas -formation of precipitate -color change

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precipitate

a solid that forms from mixed solutions. occurs if one of the products is insoluble

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Individual atom

"atom" EX) 2Mg = 2 atoms of magnesium

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Covalent atom

"molecule" EX)3CO2 = 3 molecules of carbon dioxide

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Ionic substance

"unit" EX) 4MgO = 4 units of magnesium oxide

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Law of conservation of mass

mass is neither created nor destroyed in a chemical reaction

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Combustion

the burning of any substance in O2 to produce heat A+ O2 = B

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CH = hydrocarbon

always produce CO2 and H2O

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synthesis

combination of 2 or more substances to form a compound A+B = AB

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Decomposition

a compound breaks down into 2 or more substances AB = A+B

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6 TYPES OF Decomposition

  1. metal carbonates decompose = metal oxides and CO2

  2. metal hydroxides decompose = metal oxides and H2O

  3. metal chlorates decompose = metal chlorides and O2

  4. oxyacid's decompose= metals and O2

  5. metal oxides decompose= metals and O2

  6. water decompose= hydrogen gas and oxygen gas

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Single replacement

one element replaces another in a compound A + BC = AC+ B

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in single replacement

FREE element MUST be MORE REACTIVE

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double replacement

ions in two compounds "switch partners" AB+ CD = AD + BC

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Precipitate reactions occur when..

aq solutions of ionic compounds are poured together and a solid forms

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Solubility rules

happen sequentially

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acid/base reactions

one of the products is water

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FONCl BrICS

more reactive -- less reactive

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balance equation Al + CuCl2 = Cu + AlCl 3

2 , 3, 3, 2

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What type of reaction is 2Al +3CuCl = 3Cu +2AlCl3

single replacement

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solubility

the ability of a substance, a solute, to form a solution with another substance, the solvent

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insolubility

the inability to form a solution

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