Chromatography a process in which a chemical mixture carried by a liquid or gas

Chromatography a process in which a chemical mixture

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Chromatography: a process in which a chemical mixture carried by a liquid or gas is separated into components as a result of differential distributions of the solutes as they flow around or over a stationary liquid or solid phase. Water travels upward, and the lighter component travels faster (the top color is lighter).
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1.4 Physical and Chemical Changes and Physical and Chemical Properties Changes that alter only the state or appearance, but not composition, are physical changes. The atoms or molecules that compose a substance do not change their identity during a physical change. For example, when water boils, it changes its state from a liquid to a gas, but the gas remains composed of water molecules, so this is a physical change. In contrast, changes that alter the composition of matter are chemical changes. During a chemical change, atoms rearrange, transforming the original substances into different substances. For example, the rusting of iron is a chemical change. The atoms that compose iron (iron atoms) combine with oxygen molecules from air to form iron oxide, the orange substance we call rust. A physical property is a property that a substance displays without changing its composition. It’s a characteristic of matter that can be observed without changing the basic identity of the matter. (e.g. state, size, mass, color, density, odor, melting point, boiling point, solubility, etc.) A chemical property is a property that a substance displays only by changing its composition via chemical change. It’s a characteristic that describes the behavior of matter (e.g. corrosiveness, flammability, acidity, toxicity, etc.) OTHER/FOR QUIZ Compound Can be broken down to 2 or more elements by chemical means Constant composition e.g.: water, H 2 O by mass; H:O = 1:8 gramsof O gramsof H = 16 ( 2 1 ) = 8 = 8 1 Intensive Property Independent of amount of matter e.g. density, temperature, concentration of a solution, specific heat capacity Extensive Property Depends on amount of matter e.g. mass, volume Know and Own and Practice Well Metric system SI units Unit converstions
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  • Spring '08
  • Chemistry, Atom, Mole, atoms, Chemical substance, chemical mixture, Physical and Chemical Properties

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