What happens to a substance at critical temperatures?
A) The substance can't change its state, only its temperature.
B) The substance changes its state only if it gains thermal energy.
C) The substance can't lose any more thermal energy.
D) The substance changes its state if it continues gaining or losing thermal energy.
Answer (2)
At critical temperatures, a substance cannot exist in its liquid state regardless of pressure, meaning it cannot change states. Therefore, none of the options provided accurately describe the behavior of a substance at critical temperatures, as all imply possible phase changes which do not occur there. ;
At critical temperatures, a substance cannot exist in its liquid state, meaning it does not undergo phase changes regardless of thermal energy changes. Therefore, none of the multiple-choice options accurately describe the behavior of a substance at critical temperatures. Specifically, at this point, the substance can only be in a gaseous state.
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