Beginner
Are phase changes physical or chemical. Give an example of a phase change.
Physical
solid-liquid
What does the theory of kinetic energy state?
-atoms are always moving
-the more energy added to atoms, the faster and further apart they move.
A liquid turning to a gas the the surface.
Evaporation.
Ice melts.
Physical
A gas becomes a solid.
Deposition.
Ice-Water-Water Vapor is an example of what type of change?
Phase Change which is Physical.
List at least 5 verbs used to describe a physical change.
-grind, dissolve, erode, rip, tear, break, phase changes.
Liquid to a gas throughout the liquid.
Boiling.
Alcohol evaporates.
Physical
A solid going directly to a gas.
Is energy being added of taken away?
Sublimation.
What temp. does water begin to boil?
212F/100C
What happens as molecules begin to move faster?
They spread further apart and expand.
List three examples of vaporization.
-Boiling, Evaporation, Sublimation.
Wood Rots.
Chemical.
When two or more substances are combined into entirely new properties. IT CANNOT BE CHANGED BACK!
Chemical Change.
When can matter change from one state to another? (2)
When heat/energy is added.
When heat/energy is taken away.
What happens when molecules begin to slow down?
They begin to move closer together and contract.
A gas becoming a liquid is know as __________.
Is this adding or taking energy away?
Condensation.
taking energy away.
Food is Digested.
Chemical
List at least 5 verbs used to describe a chemical change.
-rusting, rotting, curdling, cooking, light sensitivity, digesting, tarnishing.
What is a physical change?
A change in matter w/o changing the identity of the substance.
Define melting. Is energy being added or taken away?
Solid-liquid. +
A liquid becomes a solid.
Freezing.
Lighting paper on fire.
Chemical.
What are some signs that indicate a chemical change is taking place?
Fizzing/Bubble Color Change
Heat is given off, light is given off.
There is an odor.
A new substance is formed.