Context: Likewise, group theory helps predict the changes in physical properties that occur when a material undergoes a phase transition, for example, from a cubic to a tetrahedral crystalline form. An example is ferroelectric materials, where the change from a paraelectric to a ferroelectric state occurs at the Curie temperature and is related to a change from the high-symmetry paraelectric state to the lower symmetry ferroelectic state, accompanied by a so-called soft phonon mode, a vibrational lattice mode that goes to zero frequency at the transition.

Question: What aids in predicting changes of physical traits?
Answer: group theory

Question: What stage of a physical transformation can group theory be used to make prediction?
Answer: phase transition

Question: What temperature causes the change of ferroelectric materials?
Answer: Curie temperature

Question: What term describes the vibrational lattice mode that turns to 0 frequency at the change?
Answer: soft phonon mode

Question: What predicts the changes in group theory?
Answer: Unanswerable

Question: Which stage can physical properties be used to make predictions about group theory?
Answer: Unanswerable

Question: What temperature causes a change from ferroelectric to paraelectric?
Answer: Unanswerable

Question: What is the frequency of a paraelectric state before transition?
Answer: Unanswerable

Question: What is the name of the mode that moves material from a low-symmetry state to a high one?
Answer: Unanswerable