Question

eo ep eq pure substance compound mixture homogeneous mixture heterogeneous

Explanation:

To determine the category for the last row (with the molecular structures shown), we analyze the particles:

Step 1: Identify if it's a pure substance or mixture

A pure substance has only one type of particle (molecule or atom). The last row shows only one type of molecule (all the structures are identical). So it’s a pure substance.

Step 2: Identify if it's an element or compound

An element consists of only one type of atom. A compound consists of two or more different types of atoms bonded together. The molecules here have multiple types of atoms (e.g., different colored spheres, implying different elements). Thus, it’s a compound.

So the missing category (EP column) for the last row is "pure substance", and the EQ column would be "compound" (consistent with the second row’s pattern, where identical molecules with multiple atoms = pure substance + compound).

Answer:

For the last row:

• EP (category): pure substance
• EQ (category): compound