Question

why is it a physical change to freeze water? (1 point)
the new and original substances are different.
heat is released during the process.
a temperature change occurs.
only a phase change occurs.

Explanation:

A physical change is a change in which no new substances are formed. When water freezes, it changes from the liquid phase to the solid phase (ice). The chemical composition of water (\(H_2O\)) remains the same.

• The first option is incorrect because in a physical change, the new and original substances are the same (not different).
• The second option (heat is released) is a characteristic of the freezing process but does not define it as a physical change. Many chemical reactions also release heat.
• The third option (temperature change) is also a characteristic of the process but not the defining feature of a physical change. Temperature changes can occur in both physical and chemical changes.
• The fourth option is correct. Only a phase change (from liquid to solid) occurs, and no new chemical substances are formed.

Answer:

Only a phase change occurs.