What do these two changes have in common? A dinosaur bone turning into rock over millions of years; newly poured concrete becoming hard. Select all that apply.
Understand the Problem
The question is asking to analyze two processes (a dinosaur bone turning into rock and concrete becoming hard) and identify what they have in common regarding physical and chemical changes. Specifically, it seeks to determine whether they are physical changes, chemical changes, or changes of state.
Answer
Both are chemical changes.
The two changes, a dinosaur bone turning into rock and newly poured concrete becoming hard, have in common that both are chemical changes.
Answer for screen readers
The two changes, a dinosaur bone turning into rock and newly poured concrete becoming hard, have in common that both are chemical changes.
More Information
Both processes involve a transformation where the initial materials undergo changes at a molecular level, resulting in new substances.
Tips
A common mistake is assuming these are physical changes due to visible alterations. However, the key is recognizing the chemical transformation.
Sources
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