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Physical Change:
Is any change that alters the form or appearance of matter but does not make any substance in the matter into a different substance
Changes of State
Physical Change A substance that undergoes a physical
change is still the same substance after the change
Changes of state is a physical change
(EG) Water: Spilled water is a liquid, after a few hours the puddle disappears because it evaporated into water vapor, which is a gas
Changes in Shape or Form
(EG) Sugar Solution: If you allow the solution to dry out, the sugar will remain as a crust on the bottom of the pan.
Changes in Shape or Form
(EG) Dissolving, bending, crushing, breaking, chopping, filtration, and distillation are physical changes
Chemical Change:
A change in matter that produces one or more new substances
Reaction of sulfuric acid and sugar. The acid dehydrates the sugar forming a pillar of carbon (black) and steam.
Example of Chemical Change (EG) hydrogen peroxide is poured onto a
cut, it breaks down into hydrogen and oxygen
EG) Methane gas: When it burns it combines with oxygen and forms CO2 and water vapor
(EG) Combustion is a chemical change when fuel combines with air to burn
Conservation of Mass
Law of Conservation of Mass: Matter is not created nor destroyed in a chemical reaction, it just changes form
(EG) Methane gas: When you burn methane, the mass of the original methane gas and oxygen used, will equal the mass of the carbon dioxide and water produced
Matter and Thermal Energy
Temperature and Thermal Energy 1) Energy is the ability to do work or
cause change.
Temperature is a measurement of the average energy of random motion of particles of matter
a) Warm has more energy than cold due to motion of particles
Thermal Energy and Changes in Matter
Endothermic: a change in which energy is taken in
(EG) melting of ice: Ice absorbs thermal energy from its surroundings and melts –endothermic reaction