1.

    A novel crystalline solid exhibits anisotropic conductivity, high melting point, and is insoluble in common organic solvents. However, upon heating above a critical temperature, it transforms into another solid form that becomes isotropic in conductivity. What can be inferred about the nature of the transition and the high-temperature phase?

    A

    The transition is melting, and the high-temperature phase is a liquid.

    B

    The transition is sublimation, and the high-temperature phase is a gas.

    C

    The transition is a solid-state phase change to a more disordered structure, and the high-temperature phase is likely more isotropic and potentially amorphous or cubic.

    D

    The transition is a chemical decomposition, and the high-temperature phase consists of simpler molecular species.

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    6.

    A novel crystalline solid exhibits anisotropic conductivity, high melting point, and is insoluble in common organic solvents. However, upon heating above a critical temperature, it transforms into another solid form that becomes isotropic in conductivity. What can be inferred about the nature of the transition and the high-temperature phase?

    A

    The transition is melting, and the high-temperature phase is a liquid.

    B

    The transition is sublimation, and the high-temperature phase is a gas.

    C

    The transition is a solid-state phase change to a more disordered structure, and the high-temperature phase is likely more isotropic and potentially amorphous or cubic.

    D

    The transition is a chemical decomposition, and the high-temperature phase consists of simpler molecular species.

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