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Which of the following is the best evidence that a change is chemical rather than merely physical?
AThe shape of a substance changes temporarily
BA new substance is formed with different properties
CThe substance is melted and then solidified again
DThe size of particles is reduced by grinding
Answer & Solution
Correct answer: B. A new substance is formed with different properties
A chemical change produces one or more new substances with different properties. Changes such as melting or grinding do not create a new substance, so they are physical changes.
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