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Reactions and Changes (Chemical Changes (Produces new substances (Usually…
Reactions and Changes
Physical Change
Physical properties change
Substances remain same
Melting popsicle
Melting Ice Cube
Chemical Structure stays same
changes
size
shape
reversible
Chemical Changes
Production of gas, odor, sounds
Formation of Percipitate
Change in Color
Release of Heat and Light
Produces new substances
Usually can't be reversible
reversed by chemical change
Exothermic Reaction
Combustion
substance combines with oxygen
burns
leftover energy is released
heat and light
Energy
reactants -> products + energy
Endothermic Reaction
Chemical Reaction
Photosynthesis
Chemical Equation: 6CO2 + 6H2O -> C6H12O6+ 6O2
Reactants + Energy = Products
takes in light energy
Energy is absorbed
Takes in heat
