1.) Write 2 points of difference between water molecule and hydrogen molecule. 2.) Differentiate between homogeneous and heterogeneous mixture.

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1. A water molecule contains oxygen and 3 total atoms, while a hydrogen molecule is just hydrogen and only 2 atoms.

3. A homogeneous mixture is when there is no visible parts of the mixture, whereas a heterogeneous mixture may have layers, precipitate, or particles in it.