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Hello Students.Please sit down.
Classification of Matter
An element is a pure substance that is made up of a single type of atom.
So a element would have only one capital letter?
An example of an element is H Hydrogen
Yes
A compound is a pure substance made up of two or more different elements that are chemically bonded.
Let me guess. A compound has 2 or more capital letters?
Guess what?
Correct
An example of a compound is H2O Water.
A molecule is a group of two or more atoms that are held together by chemical bonds.
So a molecule has a number in the formula?
Yes.
An example of molecules with an element is H2 Hydrogen.
An example of a molecule and compound is H2O2, Hydrogen Peroxide.
Does a compound always have molecules?
Yes, it does.
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