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प्रश्न
State whether the following is physical or chemical changes.
lightning —
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उत्तर
chemical change,
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संबंधित प्रश्न
Melting of solid (wax) is a physical change.
What are reversible and irreversible changes ? Give one example for each.
Write true or false
Earthquake is a desirable change.
Write true or false
Melting of ice is a physical change.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
