Elements, Compounds, Mixtures and Pure Substances

Elements, Compounds, Mixtures and Pure Substances
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  • Good morning class, last week we talked about the atom theory. This week it is all about elements, compounds and pure substances. A pure substance is described as elements and compounds. An element however is only made up of only one type of atom. Examples of a pure substances that are also elements are things like hydrogen, oxygen, sodium, iron, copper, etc.
  • Pure substances can also be described as compounds. A compound is two or more elements chemically bonded together to make a brand new substance. Examples include water, sugar, ammonia, sodium chloride, methane, ethanol, etc.
  • Compounds and another term called a mixture are similar and different. Both are combinations of two different substances, but a mixture is a combination of two different substances that do not combine chemically.  Examples of mixtures include sand and water, sand and iron filings, water and oil, etc.
  • In review, when looking at a pure substance the chemical equation is something like H2, A compound is like water, a mixture is like gasoline and an element is oxygen. Bing! Well that is the bell, short little lesson today but hopefully you know at least a little bit about elements, compounds, and mixtures. Have a great rest of the day.
  • So what did you learn today son?
  • I learned about how interesting and unique elements, compounds, mixtures, and pure substances are.
  • Mom I am headed to the park, gonna go observe some things I learned about in science. Maybe even record what I see and pick up some extra credit.
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