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प्रश्न
State whether the following is physical or chemical changes.
cutting wood into small pieces —
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उत्तर
physical change,
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Dissolving salt in water is a reversible change.
Photosynthesis cannot take place at night.
Write short answer.
Give two examples of periodic changes
Write true or false
Melting of ice is a physical change.
What are man-made changes ?
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
Fill in the blank with the appropriate word of the statement given below:
Germination of seeds is considered a __________ change.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Water is the universal solvent. Why?
