2. The model represents a heterogeneous mixture of compounds. The two types of molecules are separated, one at the top and the other at the bottom. They are also compounds, since the molecules contain different types of atoms.
3.
a) I made this model mixture heterogeneous, since not all mixtures are distributed evenly. I also drew the Z element large and single-atomed, and the X element with two tiny atoms.
b) This compound model has two atoms of different elements, and I drew a line to signify the chemical bond.
c) For this 4-atomed compound I drew one large atom with three tiny atoms of the element attached to it (no lines).
d) This model is a solution, so the molecules are evenly mixed. Also, both the solute and the solvent are compounds with two atoms.
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