Ch20 Sec2

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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


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