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

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.