"Red" Phosphorus Is Insoluble in Carbon Disulfide, Has a Broad

question 55

Multiple Choice

"Red" phosphorus is insoluble in carbon disulfide, has a broad melting range and a very low vapor pressure, and does not conduct electricity. This evidence suggests that this substance is probably:

• A) crystalline and metallic
• B) a crystal of P4 molecule units
• C) amorphous and polymeric
• D) P4+ ions in a "sea" of electrons
• E) cubic closest-packed unbonded P atoms

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Definitions:

Carrier Proteins

Proteins that transport specific substances across cell membranes through a change in their own structure, vital for the movement of various molecules across cellular barriers.

Receptor Proteins

Proteins on the cell surface or within cells that bind to specific molecules, triggering a response in the cell.

Diffusion

The passive movement of molecules or particles from an area of higher concentration to an area of lower concentration, until equilibrium is reached.

Allergic Reaction

An immune response to a substance, known as an allergen, that is typically harmless to most people.