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The correct answer to the question "Fill in the blank. _______ is an example of a physical change." is:
a. Freezing
Explanation:
1. Freezing is a physical change because it involves the change of state from liquid to solid without altering the chemical composition of the substance. For example, when water freezes and turns into ice, it is still H2O; only the arrangement of molecules changes.
2. Conservation, hypothesis, and theory are not examples of physical changes:
- Conservation usually refers to the preservation or protection of resources or nature.
- Hypothesis is a proposed explanation for a phenomenon that needs to be tested through experiments.
- Theory is a well-established explanation based on evidence and experimentation.
Therefore, the correct answer is "a. Freezing" as it aligns with the definition of a physical change.
