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प्रश्न
State whether the following is physical or chemical changes.
shaping a piece of glass —
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उत्तर
physical change,
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Write true or false for the statement
A natural change can also be a desirable change
Classify the following changes as physical or chemical:- melting of a solid (wax)
Tick the most appropriate answer.
Photosynthesis requires
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
Give the main differences between physical changes and chemical changes.
Classify the following as a physical or a chemical change.
Melting of wax
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
