Explain the process of melting and boiling and state a safety precaution for an investigation.

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Question 2: Explain how ice changed from a solid into a liquid.

When ice absorbs heat energy, its particles gain kinetic energy and vibrate more vigorously.
At the melting point, the particles have enough energy to overcome some of the strong intermolecular forces holding them in a fixed lattice structure.
This allows the particles to move past each other, changing from a solid to a liquid state.
Question 2: What boiling point of water was recorded during the experiment?
The table provided uses "1.6" as a placeholder for the temperature when water is in the gas (steam) state. Assuming the experiment was conducted under standard atmospheric pressure, the boiling point of water is $\boxed{\text{}100^\circ\text{C}}$ .

Question 4: State ONE precautionary measure that should be taken into consideration when conducting this investigation.
A key precautionary measure is to wear safety goggles to protect the eyes from splashes or steam.

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