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Chapter 4
Elements, Compounds, and Mixtures
Term | Definition |
---|---|
Element | A pure substance that cannot be separated into simpler substances by physical or chemical means. |
Atom | The smallest unit of matter (elements are atoms). |
Metals | Shiny, and conduct heat energy and electric current well. |
Non Metals | Dull (not shiny) in appearance and do not conduct heat or electricity well. |
Metalloids | Have properties of both metals and nonmetals. |
Compound | Pure substance composed of two or more elements that are chemically combined (ie: water - H2O, Carbon Dioxide - CO2). |
Pure Substance | A substance in which there is only 1 type of particle. These particles are called atoms. |
Mixtures | When two or more substances are put together and do not form a compound (no chemical change; each substance keeps it's identity (ie: sand and water or cereal in milk)). |
Solution | Mixture that appears to be a single substance (ie: salt water or air). |
Solute | In a solution it is the substance that is dissolved (ie: Salt in water). |
Solvent | In a solution it is the substance that does the dissolving (ie: water when it dissolves salt). |
Dissolve | When particles of a substance separate and spread evenly throughout a mixture (ie: salt or sugar dissolve in water). |
Soluble or Solubility | When a substance is able to dissolve. |
Alloys | Solid solutions of metals or nonmetals dissolved in other metals (ie: bronze, steel, brass) |
Suspension | A mixture in which particles of a material are dispersed throughout a liquid or gas but are large enough that they will eventually settle out (can be separated by a filter)(ie: oil mixed with water or dust in the air). |
Colloid | A mixture in which the particles are dispersed throughout but are not heavy enough to settle out. Particles scatter light so you cannot see through it. (cannot be separated by a filter)(ie: whipped cream, milk, mayonnaise, lotion, smoke, fog). |