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WHAT ARE THE PROPERTIES OF MATTER?

PHYSICAL CHANGE?CHEMICAL CHANCE?

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CHEMICAL REACTIONS

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Physical and Chemical PropertiesAll substances have properties that we can use to identify them.

idenify a person by his face, voice, height, finger prints, DNA etc..

matter has properties - and there are many of them.

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Physical properties Chemical properties

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Physical properties do not change the chemical nature of matter. IMF are changed in their observation.

Examples of physical properties are: appearance, texture, color, smell, freezing point, boiling point, melting point, infra-red spectrum, opacity,

viscosity and density.

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Chemical properties do change the chemical nature of matter. INTRA-MOLECULAR forces change in their observation.

Examples of chemical properties are: heat of combustion, reactivity, PH, flammability, being poisonous.

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PHYSICAL & CHEMICAL CHANGES The changes that take place in substances may be categorized in two classes: Physical Change - does not produce a new

substance (e.g., phase changes -melting, freezing, condensing-, breaking, crushing, cutting, and bending.) –IMF CHANGE!!!

Chemical Change - produces a new substance (e.g., burning, rusting, photosynthesis, digestion, respiration, electrolysis, precipitation, and decomposition.) INTRA-MOLECULAR FORCES CHANGE!!!

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Physical changesmelt a block of ice, you still have H2O at the end of the change. break a bottle, you still have glass.

Physical changes are about energy and states of matter.

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Chemical changesburn a log in a fireplace light your Bunsen burner in labdigestion of food, souring milk

Chemical changes happen on a molecular level.

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A chemical change occurs when a new substance is formed.

In a chemical reaction, bonds are broken and new bonds are formed between different atoms.

During this reaction, there is a rearrangement of atoms that makes or breaks chemical bonds.

What are chemical bonds?

(bubbles seen)

4. Explosion

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References

• http://www.iun.edu/~cpanhd/C101webnotes/matter-and-energy/properties.html

• http://www.chemtutor.com/react.htm • http://www.ric.edu/faculty/ptiskus/chemical/