Elements, Compounds, and Mixtures by Dayle Cowan https://padlet.com/115652/6ka75pw6azz Chapter 5 en-us 2016-11-01 19:11:30 UTC 2023-04-24 19:10:35 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Pizza.png Elements 5-1 115652 https://padlet.com/115652/6ka75pw6azz/wish/134936257
  • a pure substance that can not be separated into simpler substances 
  •  pure substance - basic particles are identical
  •  classified into 3 groups
  • metals, nonmetals, and metalloids 
  • metals are tend to be shiny solids
  •  conduct heat and electricity well
  •   do not conduct heat or electric current very well
  •  most nonmetals are gases
  • solid nonmetals have a dull appearance
  •   some properties of metals and some of nonmetals
  • electric conductivity of metalloids can vary
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  •  a pure substance composed of two or more elements  
  • properties are different from the elements that make it
  •    different materials exist after the reaction
  •  compounds are chemical changes
  •  characteristic properties are melting point, boiling point, density, and color
  •  chemical property examples include heat and light
  •  every compound has a unique set of properties
  • identify properties by measuring and observing
  •  broken down by heat or electricity
  •   elements are always present in a fixed ratio 
    • ]]>     2016-11-02 21:07:37 UTC https://padlet.com/115652/6ka75pw6azz/wish/134937615     Mixtures 5-3 115652 https://padlet.com/115652/6ka75pw6azz/wish/134940056
  •  combination of two or more substances that are not chemically combined
  • physical change
  •  each chemical keeps its identity
  •  can be separated easily
  •  separated by magnets, distillation/heat, and a centrifuge
  •  appearance and properties are the same 
  • component that is larger is a solvent 
  •  smaller amounts are solutes
  • grams of solute per milliliter
  • dilute solution - small amount of solute  
  • concentrated solution has more
  •  solubility increases, as temperature increases. 
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