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Unit 3

Pure Substances and Mixtures Notes

TermDefinition
atoms the smallest unit of an element that maintains the properties of that element.
element made up of one or more of the same kind of atom chemically combined.
compound made up of different kinds of atoms chemically combined.
mixture contains a variety of elements and compounds that are not chemically combined with each other.
acids have a pH value below 7. Example: Vinegar.
bases have a pH value above 7. Example: Baking Soda
neutral has a pH value of 7. Example: Water/Salt
heterogeneous mixture one that does not have a uniform composition.
homogeneous mixture substances are evenly spread throughout the mixture.
suspension a heterogeneous mixture in which the particles of a material are spread throughout a liquid or gas but are too large to stay mixed without being stirred or shaken. Example: a snow globe or oil and vinegar salad dressing.
solution a type of homogeneous mixture in which one substance is dissolved into another substance. Example: sweet tea or Kool-Aid
colloid a heterogeneous mixture in which small particles are spread throughout a liquid or gas, but they do not settle out quickly. Example: Jell-O or milk
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