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What Are 5 Key Differences Between Physical and Chemical Changes?

Learn the 5 main differences between physical and chemical changes including reversibility, energy involvement, and changes in composition.

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Video transcript

Physical changes involve changes in the state or appearance of a substance without altering its chemical composition. Chemical changes result in the formation of new substances with different properties. Physical changes are often reversible, like melting ice. Chemical changes are usually irreversible, such as rusting iron. Energy may or may not be absorbed or released in a physical change, whereas energy is often involved in chemical changes as heat, light, or sound. Physical properties such as shape or phase change, but chemical properties like reactivity change fundamentally.

Questions and answers

  1. What is a physical change?

    A physical change alters the appearance or state of a substance without changing its chemical composition, such as melting or freezing.

  2. What is a chemical change?

    A chemical change results in the formation of new substances with different properties, such as rusting or burning.

  3. Are physical changes reversible?

    Physical changes are often reversible, like melting ice turning back into water.

  4. Is energy involved in physical and chemical changes?

    Energy may or may not be involved in physical changes, but chemical changes usually involve energy changes like heat, light, or sound.

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For a deeper understanding of how physical and chemical changes affect everyday materials, explore our related videos on chemical reactions, states of matter, and common physical transformations.