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Reactions and Changes (Exothermic Reaction (release energy (more than…
Reactions and Changes
Exothermic Reaction
release energy
more than needed to break bonds
energy=0-can create product
chemical reaction
product-hotter than reactants!
example: Fireworks !
releases heat
Reactants -- products + energy
Endothermic Reaction
Chemical Reaction
Energy for breaking bonds > Making Bonds Energy
Example: PHOTOSYNTHESIS
Energy used from surroundings
Less energy is released
Usually in form of heat
Endothermic means- "Taking In heat"
Physical Changes
properties may change
Substance item/object/matter stays same
An example:
All H2O!
Chemical Changes
matter changes into different substance
Mass is conserved
5 ways to spot chemical changes
Change in color
Gas is made
Makes precipitate
New/ Different properties
New odor
Example:Rusting iron
Created by:
Period 2 Tres Interesante Quarks
Naina Kalra #216
Nyla Zia #234
Divya Ramaswamy # 231
