Question

What happens to the molecules of a substance when it changes phase?

Answer 1

Energy is required to change the phase of a substance, such as the energy to break the bonds between molecules in a block of ice so it may melt. During a phase change energy my be added or subtracted from a system, but the temperature will not change.

Answer 2

When it comes to phase shifts or phase change the greater the intermolecular interactions are the closer the molecules are to one another.

What is phase change?

• A phase change occurs when matter transitions from one state to another (solid, liquid, gas, plasma).

• When enough energy is provided to the system (or when a significant quantity is removed), as well as when the pressure on the system is adjusted, these changes occur.

• Any two phases of matter can undergo phase transitions.

• All phase shifts are accompanied by an energy shift.

• Isothermal phase shifts occur in all cases.

• Temperature changes can cause substances to change phase often.

• Most substances are solid at low temperatures; as the temperature rises, they become liquid; and at even higher temperatures, they become gaseous.

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