[Answer] Which statement correctly describes whether a compound is a pure substance?

Answer: A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.
Which statement correctly describes whether a compound is a pure substance?

In pure compounds reactivity is regulated by the physical properties of the sample. For instance grinding a sample to a higher specific surface area increases its reactivity. In impure compounds the reactivity is also affected by the inclusion of contaminants. In crystalline compounds the crystalline form can also affect reactivity . However in all cases reactivity is primarily due to the sub-atomic …

A compound is a pure chemical substance composed of more than one element. The properties of a compound bear little similarity to those of its elements. The standard nomenclature of compounds is set by the International Union of Pure and Applied Chemistry (IUPAC). Organic compounds are named according to the organic nomenclature system.

If four phases of a pure substance were in equilibrium (P = 4) the phase rule would give F = −1 which is meaningless since there cannot be −1 independent variables. This explains the fact that four phases of a pure substance (such as ice I ice III liquid water and water vapour) a…

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