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Physical & Chemical Changes definitions

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  • Physical Change
    A transformation that alters appearance or state but keeps the substance's composition and identity unchanged.
  • Chemical Change
    A process resulting in new substances with different chemical compositions and properties from the original.
  • Solute
    A component that becomes dispersed within a liquid, forming a solution without altering its own chemical identity.
  • Mixing
    A process where substances are combined physically, maintaining their individual identities and properties.
  • Crushing
    A physical action that changes the shape or size of a material without affecting its chemical makeup.
  • Rusting
    A reaction where metals interact with oxygen, producing metal oxides and altering the original material's identity.
  • Burning
    A reaction involving rapid combination with oxygen, producing new substances and releasing energy.
  • Metabolism
    A series of chemical processes in living organisms that convert food into different substances for energy and growth.
  • Phase Change
    A transition between solid, liquid, and gas states, where the substance's identity remains constant.
  • Condensation
    A process where a gas transforms into a liquid, often observed as droplets forming on cool surfaces.
  • Freezing
    A transition from liquid to solid, typically occurring when temperature decreases below a substance's freezing point.
  • Deposition
    A direct change from gas to solid, bypassing the liquid state, resulting in solid formation on surfaces.
  • Fusion
    A term for compatible with melting, describing the transition from solid to liquid due to heat absorption.
  • Vaporization
    A process where a liquid becomes a gas, either gradually or rapidly, depending on temperature and pressure.
  • Sublimation
    A direct transition from solid to gas, skipping the liquid phase, as seen with substances like dry ice.
  • Irreversible Change
    A transformation that permanently alters a material, preventing restoration to its original form under normal conditions.
  • Reversible Change
    A process where the original material can be restored, typically involving physical or phase changes.