What are the differences between an element, a compound, a homogeneous mixture, and a heterogeneous mixture?

Visibly different substances

Explanation:

A substance consisting one type of atom. heterogeneous mixture: A mixture that consists of visibly different substances or phases. homogeneous mixture: A mixture that has the same uniform appearance and composition throughout its mass.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

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