Concept explainers
(a)
Interpretation:
The number of chemical changes is to be determined.
Concept introduction:
The change that takes place only in state or appearance and not in the composition is known as physical change. It brings change in physical properties only.
The change that takes place in the composition is known as chemical change. It changes physical as well as chemical properties of a substance.
(b)
Interpretation:
The number of physical changes is to be determined.
Concept introduction:
The change that takes place only in state or appearance and not in the composition is known as physical change. It brings change in physical properties only.
The change that takes place in the composition is known as chemical change. It changes physical as well as chemical properties of a substance.
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Chemistry: The Molecular Nature of Matter and Change
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