Question

While researching a topic, a student has taken the following notes:

Atoms in a solid state are ordered and cannot move freely; atoms in a liquid state are disordered and can move three-dimensionally.
Under high pressure and heat, potassium forms an unusual dual structure: a solid lattice of atoms (the host) surrounds partially liquid atom chains (the guest).
This hybrid state (chain melt) was previously thought to be a transitional phase between solid and liquid states.
A 2019 study confirmed that even under extreme heat, the host structure remained solid while the guest structure did not become fully liquid.
These guest atoms exhibited disorder but were confined to one-dimensional movement by the host.
Chain melt was determined to be a stable, distinct state.

The student wants to explain why potassium is not fully liquid in a chain melt state. Which choice most effectively uses relevant information from the notes to accomplish this goal?

Accepted Answer

In chain melt, some potassium atoms exhibit liquid-like disorder but remain confined by a solid lattice, preventing the free three-dimensional movement of a fully liquid state.

Answer

A chain-melt state involves a dual structure of a solid host lattice surrounding partially liquid chains of potassium atoms.

Answer

A 2019 study confirmed that potassium atoms do not become fully liquid under high pressure and heat; instead, they enter chain melt, a transitional phase between solid and liquid states.

Answer

Because potassium atoms remain disordered in chain melt even under extreme heat, they cannot reach a fully liquid state.

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SAT Rhetorical Synthesis practice question

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