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Changes in Reactions (Chemical Changes (Evidence of chemical reaction…
Changes in Reactions
Chemical Changes
Chemical Properties change
Reactivity
Flammability
less energy required to break bonds
Less energy in reactants
Irreversable
Evidence of chemical reaction
Color Change
Bubble/Fizz Production
Odor Change
Substances React
Create new Substance(s)
Examples
Tree leaves change color
Striking a match
Baking Soda+Vinegar
Exothermic Reactions
Chemical Reaction
Releases Energy
Energy produced
Products have more energy
Reactants have less energy
Breaks bonds
Uses little Energy
Reactants -> Products + Energy
Examples
Rusting Iron
Fireworks
Physical Changes
Substances stay the same
Properties do not change
Size, shape, etc. change
Examples
Irreversable
cutting paper
Breaking Glass
Reversable
water evaporation
clay molding
folding paper
Braiding/twisting
Endothermic Reactions
Examples
frying an egg
Pan is input of energy
Photosynthesis
Sun is input of energy
Chemical Reaction
absorbs energy
energy lost in reaction
Breaks Bonds
Uses a lot of energy
Requires constant input of energy
Reactants + Energy -> Products
Created by: Natalie Loo, Samarth Bala, Nazeem Kamel, and Trisha Raman
