Physical and Chemical Changes

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PHYSICAL SCIENCE : 

PHYSICAL SCIENCE PHYSICAL AND CHEMICAL CHANGES JEFFERSON MIDDLE SCHOOL MR. HUNDERMARK

I. PHYSICAL AND CHEMICAL CHANGES : 

I. PHYSICAL AND CHEMICAL CHANGES

1. A CHANGE IN WHICH PHYSICAL PROPERTIES OF A SUBSTANCE CHANGE, BUT THE SUBSTANCE REMAINS THE SAME KIND OF MATTER. : 

1. A CHANGE IN WHICH PHYSICAL PROPERTIES OF A SUBSTANCE CHANGE, BUT THE SUBSTANCE REMAINS THE SAME KIND OF MATTER. A. PHYSICAL CHANGES

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2. EXAMPLES OF PHYSICAL PROPERTIES: SIZE COLOR SHAPE STATE OF MATTER DENSITY TEXTURE SMELL

3. The CHANGES of STATE of matter are: : 

3. The CHANGES of STATE of matter are: MELTING FREEZING CONDENSATION VAPORIZATION SUBLIMATION

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B. The properties that describe how a substance changes into other new substances are called CHEMICAL PROPERTIES

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C.Examples of CHEMICAL PROPERTIES 1. FLAMMABILITY - the ability to burn 2. REACTIVITY - The ability to combine easily with other atoms to form new and different substances.

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D. When a chemical change occurs, the bonds between atoms break, and the atoms rearrange to form new and different substances.

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a. Chemical changes are often called “CHEMICAL REACTIONS”

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b. Example H2O2 H2O + O2 During this chemical change, the bonds between atoms break and the atoms rearrange to form new and different substances. (The equation above is not balanced)

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c. When chemical changes occur, matter is neither CREATED nor DESTROYED. After the chemical change, you have the same number of atoms that you had before the chemical change.

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E. LAW OF CONSERVATION OF MATTER: MATTER IS NEVER CREATED OR DESTROYED IN A CHEMICAL REACTION (chemical change).

F. Clues to Chemical Changes : 

F. Clues to Chemical Changes Change in temperature Light Sound Odor Fizzing or foaming Change in color

Visit the STRANGE MATTER web site. : 

Visit the STRANGE MATTER web site. Click on “Transform Stuff” to learn more about physical and chemical changes. If you have time, explore the rest of this website.

Visit the websites below to learn more about PHASE CHANGES : 

Visit the websites below to learn more about PHASE CHANGES The Atoms Family Purdue Chemistry