While physical changes can alter the appearance or state of matter without changing its chemical composition, they generally do not produce the same observable signs as chemical reactions. Physical changes involve changes in physical properties such as shape, size, and state of matter.
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Yes, physical changes can manifest similar observable signs as chemical reactions. Both may involve color changes, alterations in state (solid to liquid or gas), and temperature variations. However, the crucial distinction lies in the nature of the change. Physical changes retain the substance’s molecular composition, while chemical reactions result in the formation of new substances. For instance, melting ice (physical change) and dissolving salt in water (physical change) can exhibit similar signs, but the substances involved remain the same. Understanding the fundamental differences between physical and chemical processes is essential for accurate interpretation of observable signs.