What are three ways that substances can be described?​

chemical name, for example, benzene;

number, for example, EC number 200-753-7, and.

chemical composition, for example, >99 % benzene and <1 % toluene. The composition is determined by chemical analysis.

Explanation:

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.