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Reactions and Changes (Physical Change (properties of materials change,…
Reactions and Changes
Physical Change
properties of materials change
substances stay same
boiling- liquid to gas
melting- solid to liquid
freeze- liquid to solid
Endothermic Reaction
chemical reaction effect
product energy> reactant energy
Difference = energy needed
Breaks bonds
Absorbs energy
Chemical Change
Production of a Gas
Baking Soda and Vinegar
Change in Color
Banana Ripens
New Substances Created
Precipitate
Solids from Liquids
Curdled Milk
Exothermic Reaction
Example: Combustion
reactions give heat
Release energy to surroundings
Energy released as heat
Surroundings are hot
chemical energy changes
reactants>products
