it asks for a one sentence
rule about relationship between phase changes and temperature
and
rule about phase change and heat energy
The rule about the relationship between phase changes and temperature:
"The temperature remains constant during a phase change."
The rule about the relationship between phase changes and heat energy:
"Heat energy is absorbed or emitted during a phase change." (For water, for example, heat energy is absorbed when changing from a liquid to a gas and heat energy is emitted when changing from a gas to a liquid.)
Rule about relationship between phase changes and temperature: The temperature remains constant during a phase change until all the substance has either melted or vaporized.
To explain how to get the answer:
1. Understand the concept of phase changes: Phase changes occur when a substance transitions from one state (solid, liquid, or gas) to another, such as melting, boiling, or condensing.
2. Recognize that during a phase change, the temperature does not change. It stays constant even if heat is continually added or removed.
3. Remember that this is because the added or removed heat energy is used to break or form intermolecular forces holding the particles together, rather than increasing or decreasing the temperature of the substance.
4. Apply this knowledge to conclude that the temperature will only start to change once the phase change is complete.