Question
Give the main difference between physical changes and chemicals changes.
| Property | Physical change | Chemical change |
| Composition of substance | No new substance is formed. However some physical properties of the original substance may change. | One or more new substances with different properties and compositions from the original substance (s) are formed. |
| Nature of change | The change is temporary and reversible. | The change is permanent and irreversible. |
| Mass of substance | There is no change in the mass of the substance undergoing a physical change. | There is a change in the mass of the substance undergoing a chemical change. However, the total mass of the substances involved in a chemical change remains constant. |
| Energy change | No significant change in energy is involved. | Energy is either absorbed or evolved during a chemical change. |
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