changes and properties

changes and properties - of multiple phases or elements....

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Josh Huver Huver - 1 Mr. Billings Honors Chemistry 17 January, 2006 Changes and Properties Two categories, which are known as extensive and intensive, exist to classify matter. Extensive properties are the properties that can be seen with the naked eye, such as color and size. Intensive properties deal with composition, such as density. Every sample of a given substance has identical intensive properties because every sample has the same composition. Matter is readily available in three different forms: gas, liquid or solid. From these forms, physical changes can be classified as reversible or irreversible. Melting ice into water, then freezing it back into ice is an example of a reversible physical change. Substances are pure, solutions are mixed. They are similar because they are homogeneous with similar properties. Mixtures are either homogenous or heterogeneous. Differences in physical properties can be used to separate mixtures: Homogenous mixtures consist of a single phase or element while heterogeneous mixtures consists
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Unformatted text preview: of multiple phases or elements. Some examples of homogeneous mixtures are: food coloring and mouthwash. Some examples of heterogeneous mixtures are: ice cubes in water, and mashed, unpeeled potatoes. Chemical changes are changes that result in a chemical reaction. During a chemical change, the composition of matter always changes. Possible clues are a transfer of energy, change of color, production of gas, or formation of the weathers property. Physical changes are changes that do not result in the production of a new substance. If you melt a block of ice, you still have H2O at the end of the change. If you break a bottle, you still have glass. Painting a piece of wood will not make it stop being wood. Some common examples of physical changes are; melting, freezing, condensing, breaking, crushing, cutting, and bending. Special types of physical changes where any object changes state, such as when water freezes or evaporates, are sometimes called change of state operations....
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