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chem reactions
π«
chem reactions
Synthesis
A + X β AX
A and X can be elements or simple compounds
AX is a compound
element + oxygen β oxide of element
metals + sulfur β sulfides
nonmetals + oxygen β oxides
oxides of active metals + water β metal hydroxides
Decomposition
AX β A + X
electrolysis - decomposition of water using electricity
exceptions
metal carbonate β metal oxide + carbon dioxide
metal hydroxide β metal oxide + water vapor
metal chlorate β metal chloride + oxygen gas
Single Replacement
A + BX β AX + B where A+B are metals
Y + BX β BY + X where Y+X are nonmetals
reactivity
group 1A increases β
halogens decreases β
most active metals + water β metal hydroxide + hydrogen gas
less active metals + steam β metal oxide + hydrogen gas
more reactive metals + some acids
Double Displacement
AX + BY β AY + BX
one compound produced:
precipitate
insoluble gas
molecular compound (usually water)
other compound usually aqueous
Combustion
Cx + Hy + O2 β CO2 + H2O
Identification
only one reactant? β decomposition
reactants two elements / simple compounds? β synthesis
reactants oxygen + hydrocarbon? β combustion
reactants element + compound (not hydrocarbon) β single
reactants two compounds composed of ions? β double
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The Great Train Robbery
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Chapter 44: Animal Sensory Systems
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