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Introduction to Matter
Transcript of Introduction to Matter
Characteristics of materials that can be observed without changing the substance
Properties that do not depend on the amount of matter present
Properties that do depend on the amount of matter present
Changes only the physical properties but not the chemical character
properties characteristic of a substance that are involved in chemical changes
observed only when a substance undergoes a
a change in a material where new substances with new properties are formed
How can we tell a chemical change has occurred?
To prove a chemical reaction has occurred you must look for one of these 4 things!
2)Precipitate has formed
3)Release or absorbtion of energy
4)A gas is produced
Never Trust an atom... They make up Everything!!
A mixture is a blend of two or more types of matter, each retaining it's own properties and identity.
Two types of Mixtures
Homogeneous - Same throughout the mixture, cannot see different components (even though they are there). Also called solutions!
Heterogeneous - Different throughout the mixture, can see the different components.
Pure substances have a fixed composition. They differ from a mixture in two ways
1. Every sample of a given pure substance has exactly the same characteristic properties
2. Every sample of a given pure substance has exactly the same composition
Pure substances are either
Elements - anything on the periodic table!! (Hydrogen, Nitrogen, etc...
Compounds - can be decomposed, or broken down, into two or more simpler compounds or elements by a chemical change (Water, Salt, etc...)
Matter can exist in different states...
No definite shape
Takes the shape of it's container
No definite Shape
Fills it's container
No definite volume
Plasma is a high-temperature physical state of matter in which atoms lose their electrons
Light in a fluorescent bulb
All matter has properties that we use for identification/classification...
There are Physical properties and Chemical properties
We also have ways of identifying when a change has occurred in matter (of course you must first now all the physical and chemical properties)
There are physical changes and Chemical Changes
Mrs. Robinson - 2013