Question

A large bar of solid gold is melted into liquid. The liquid is then poured into molds to make a number of gold coins. Was this a chemical or physical change? Explain.

Solution

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Changing the phase or state of a substance is considered a physical change because its chemical properties and composition are never altered. It is still identified as the same substance. In this case, since melting the gold bar is a change that takes place when the solid turns into a liquid, it undergoes a physical change.

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