Elements, compounds and mixtures 3

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Look at the following figures where the red spheres represent oxygen atoms and the pink ones hydrogen atoms.

 

 

Select the figure showing a mixture of three elemental species.

	Wrong. This figure only shows water molecules H2O.
	Wrong. In this figure there is only water molecules H2O and molecules of one element, oxygen O2..
	Right. This figure represents a mixture of three elemental species, H2, O2 and O3.
	Wrong. This figure represents a single compound, water H2O.

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