What happens to the particles of a substance when it changes from a solid to a l

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Question: What happens to the particles of a substance when it changes from a solid to a liquid? (2023)

Options:

Correct Answer: They gain energy

Exam Year: 2023

Solution:

When a solid melts into a liquid, the particles gain energy, allowing them to overcome some of the forces holding them in fixed positions.

What happens to the particles of a substance when it changes from a solid to a liquid? (2023)

What happens to the particles of a substance when it changes from a solid to a liquid? (2023)

Step 1: Start with a solid substance. In a solid, the particles are tightly packed together and held in fixed positions.
Step 2: When heat is applied to the solid, the particles begin to absorb energy.
Step 3: As the particles gain energy, they start to vibrate more quickly.
Step 4: With enough energy, the particles can overcome the forces that keep them in fixed positions.
Step 5: The particles then move apart from each other, allowing the solid to change into a liquid.

Particle Theory of Matter – Understanding how particles behave in different states of matter, particularly during phase changes.
Energy Transfer – The concept that energy is absorbed during the melting process, leading to changes in particle movement.
Forces Between Particles – Recognizing the role of intermolecular forces in maintaining the structure of solids and how they are overcome during melting.