Class 7 Science Physical and Chemical Changes OneShot in 20 Minutes !! - LearnFatafat

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Physical changes involve alterations in the physical properties of substances, while chemical changes result in the formation of new substances with different properties. Examples include rusting of iron as a chemical change and heating metal as a physical change.

Insights

  • Physical changes alter the physical properties of substances like shape and size without changing their chemical composition, while chemical changes result in the formation of new substances with different properties.
  • Rusting of iron exemplifies a chemical change where iron transforms into iron oxide, showcasing irreversible alterations in chemical composition, unlike physical changes that focus on modifications in physical properties.

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Recent questions

  • What are physical changes?

    Physical changes involve alterations in the physical properties of substances, such as shape, size, color, and state. Examples include changing the shape of metal by beating it and altering the size of a balloon by filling or releasing air.

  • How do substances transition between states?

    Substances transition between states (solid, liquid, gas) by heating or cooling them, without forming new substances. This process involves altering the physical properties of the substance without changing its chemical composition.

  • What defines chemical changes?

    Chemical changes involve a change in chemical composition, resulting in the formation of new substances. An example is the rusting of iron, where iron transforms into iron oxide, indicating a change in chemical properties.

  • Can chemical changes be reversed?

    Chemical changes are irreversible and involve the formation of new substances with different properties from the reactants. Once a chemical change occurs, it is not possible to revert the substances back to their original state.

  • What is corrosion?

    Corrosion is the gradual deterioration of metals due to environmental factors, leading to the degradation of metal properties. It is a chemical process that results in the formation of new substances on the surface of the metal, affecting its integrity and strength.

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Summary

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Physical vs. Chemical Changes in Substances

  • Physical changes involve alterations in the physical properties of substances, such as shape, size, color, and state.
  • Examples of physical changes include changing the shape of metal by beating it and altering the size of a balloon by filling or releasing air.
  • Heating or cooling substances can transition them between states (solid, liquid, gas) without forming new substances.
  • Chemical changes, unlike physical changes, involve a change in chemical composition, resulting in the formation of new substances.
  • Rusting of iron is an example of a chemical change where iron transforms into iron oxide, indicating a change in chemical composition.
  • Chemical changes are irreversible and involve the formation of new substances with different properties from the reactants.
  • Corrosion is the gradual deterioration of metals due to environmental factors, leading to the degradation of metal properties.
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