Physical and Chemical Changes — CHEMISTRY STD 8 — Question
ICSE BoardEnglish MediumSTD 8CHEMISTRYPhysical and Chemical Changes2 Marks
Question
Compare the energy changes involved during a physical and a chemical change.
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Answer
Physical change : No gain or loss of energy during the physical change. Energy required for completion of a physical change is released when the change is reversed
Chemical change : Energy is either absorbed or evolved during the chemical change. Energy in the form of light, percussion $($pressure$)$ or generally heat energy is required for a chemical change.
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