Question

te for advanced students: in some sketches the distance between particles has been exaggerated to ma
substance\tclassification
\t\t(check all that apply)
normal\t1000x\t10,000,000x\tgas
\t\t\tliquid
\t\t\tsolid
\t\t\telement
\t\t\tcompound
\t\t\tmixture
\t\t\tsolution
\t\t\tpure substance
\t\t\thomogeneous mixture
\t\t\theterogeneous mixture

Explanation:

1. Gas: The particle (atom or molecule) is widely spaced with a large, diffuse region (the "cloud" or space around the central part), which is characteristic of gas particles having high kinetic energy and large intermolecular distances.
2. Element: The sketch shows a single type of particle (the two small dots within the larger sphere, likely representing a single atom or a diatomic molecule of the same element, as there's no indication of different types of atoms bonding).
3. Pure Substance: Since it's either an element (as reasoned) and not a mixture (no multiple types of particles or phases), it's a pure substance.
4. Homogeneous (if gas): Gases are homogeneous as their particles are uniformly distributed (though the sketch's exaggeration is noted, the fundamental nature of gas is uniform). But the key classifications here are gas (due to particle spacing), element (single particle type), and pure substance (element is a pure substance). Mixture, compound, solid, liquid, heterogeneous mixture, and solution don't apply (no multiple substances, no fixed bonding for compound, not close-packed for solid/liquid, not a mixture of substances).

Answer:

• gas (checked)
• element (checked)
• pure substance (checked)