Praxis 5005 Practice Question
Which of the following is an example of a physical change?
Correct Answer: C
Rationale: Ice melting is a classic example of a physical change, as it involves a change in state from solid to liquid without altering the chemical composition of the water.
Firewood burning (A) represents a chemical change, as it transforms the wood into ash and gases, fundamentally altering its composition. A nail rusting (B) is also a chemical change, resulting from a reaction with oxygen and moisture, creating iron oxide. Lastly, a hamburger frying (D) involves cooking, which induces chemical changes in the meat due to heat, affecting its flavor and texture. Thus, only ice melting exemplifies a physical change.
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