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Changes and Reactions By: Ashika, Dhruv, Alice, and Cody Period 5…
Changes and Reactions
By: Ashika, Dhruv, Alice, and Cody
Period 5
Physical Changes
Physical Properties
Viscosity
Resistance to flowing
Conductivity
Allows heat to flow
- [ X ]
Malleability
Doesn't shatter
Hardness
Scratch each other
Melting Point
Solid to liquid
Density
Purity of a substance
Boiling Point
Liquid to gas
Endothermic reactions
absorbs energy
Energy breaks bonds
Energy amounts differ
Product's energy > Reactant's energy
Writing an equation
left side
Reactant & Energy terms
Right Side
Energy Term
examples
photosynthesis
water evaporation
Exothermic Reaction
Releases energy
Heat
Light
Product > energy required to break bonds
Equation
Reactants on left side
Product on right side
Energy on Product side
Extremely Exothermic Reaction
Combustion
Examples
Burning Sugar
Burning Candle
Chemical Changes
Conservation Of Mass
No Matter Destroyed
Chemical Equations H2 + 0 -> H20
Matter Never Magically Created
Synthesis
2 create one A + B ---> AB
Decomposition
1 breaks into 2 AB ---> A + B
Equilibrium
Both Sides are Equal
