Ch20 Sec2
Whenever you ______,____,____,or _____ you are causing a physical change
Cut, Tear, Grind, or Bend Matter
The reverse process of sublimation is _____________
Deposition
Matter changing from one state to another is a ______ changes
Vaporization
Condensation
When a gas turns into a liquid
Depositon
When gas changes into a solid
What is a clue that a chemical change has occirred that can also save lives
When the food smells rotten
How does rust form
when steel is exposed to oxygen and water in the air
What is rust
A reddish poddery substance
Precipitate
A solid that seperates out of a chemical change the form of a solid
What happens to sugar when it is added to ice tea
Although the sugar seemes to diesappear it does Not
Why do leaves change from green to various colors
Because in the fall cholrophyll production stops and pigments become visual
The change in food color as it coolds is because of a ______ change
Chemical
The substance prodiced dirung a _____ change cannot be changed back into the original sinsyances by _____ means
Chemical and physical
How is a chemical change diffrent from a physcial change
Chemical change is diffrent from a physical change because it is easier to find physical changes
Pigments
Chemicals that give leaves their color
During a chemical change the ____ or the _____ changes
Composition and Matter
Main point to remember when contrasting chemical change and physical change
In a physical change the composition of a substance does not change
Law of Converservation of Mass
Law first performed by Lquasher that stated the total mass of the matter is the same before and after a phisical or chemical change
Vaporization
Ligiud changing into a gas
Chorophyll
Makes the leaves green
Mass is conserved during a chemical change why
Mass is conserved during chemical change because that total mass of the matter is the same before and after a physical or chemical change
What did Lavoisier recognize
Mass of gas that is given off or taken in
The particles within the matter _____ to form ___ substances but they are ________________
Rearranged, New, and not destroyed and new participial are created
A sign of chemical change is the ___ or ___ of energy by an object
Release or gain
The total mass of the matter is the _____ before and after a _____ or ______ change
Same Physical and Chemical
The reverse process of vaporization is ____________
Sublimation
During a chemical change the composition of the _____ changes
Substance
Chemical change
Substance that are changed into diffrent substances
Physical change
The form or apperance of matter changes but not its composition
Sublimation
The process in which a solid changes directly into a gas
Antoine Lavoisier
The scientist who first performed that careful experiment to prove that mass is conserved
