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Chemistry Notes Part 2 Intro - Coggle Diagram
Chemistry Notes Part 2 Intro
Chemical Reactions
Chemical vs physical changes
Chemical
Irreversible
New molecules created
Change in color
Temperature change
Light and/or sound
Release of energy
Physical
Reversible
No new molecules created
Making and breaking bonds
Making bonds
Releases energy
Exothermic
Breaking bonds
Requires energy
Endothermic
Reaction Types
Formation /
Synthesis
Two or more substances make a more complex product
e.g. 2Mg + O2 -> 2MgO
Decomposition
One compound make two products
e.g. CuCO3 -> C2O + CO2
Single Replacement /
Displacement
One element takes the place of another one in a compound
e.g. Cu + 2AgNO3 -> 2Ag + Cu(NO3)2
(copper takes the place of silver)
Cation replaces cation to balance anion
Double Replacement
Parts of two ionic compounds are transposed to make 2 new compounds
AB + CD -> AD + CB
e.g. KI + Pb(NO3)2 -> PbI2 + KNO3