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Chemistry (Endothermic reaction Ihina Nath #323 (Absorption of heat (More…
Chemistry
Physical Changes
Cori Yim #332
Evidence
Vaporization
Liquid to gas
Sublimination
Solid to gas
Examples
Reversible
Braiding
Non-reversible
Cutting/Cracked
Cracked egg
Condensation
Liquid to solid
Definition
Properties change
Substance stays same
Endothermic reaction
Ihina Nath #323
Absorption of heat
More energy to break bonds
Ex. mercury oxide
Added heat
Mercury and Oxygen
endothermic - "taking in heat"
Reactants+Energy -> Products
Chemical Changes
Anushka Singh #329
Evidence
Gas
Examples
baking soda + vinegar= bubbles
combustion of wood
Explosion of fireworks
Color
Examples
Silver bracelet- darken
copper- green
match burns - turns black !
Precipitate
silver nitrate + sodium chloride = precipitate
A solid formed chemicaly
Defenition
substance reacts chemically.
Exothermic Reaction
Mamata Elangovan #307
Releases energy
Less energy to break bonds
Examples:
Freezing
Combustion
1 Propane + 5 Oxygen = 2220 kJ (Heat)
Reactants -> Products + Energy
