Question

value: 3
when water turns into ice, its molecules ____.
○ a. expand
○ b. contract

3/5

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Explanation:

When water freezes into ice, the water molecules form a crystalline structure with more space between them compared to liquid water. This causes the volume to increase (expansion), while the molecules themselves don't expand in size but the arrangement leads to a larger overall structure. So the molecules' arrangement results in expansion of the substance (ice is less dense than water), meaning the molecules' arrangement leads to the material expanding. So the correct option is a.

Answer:

a. expand