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प्रश्न
True or false
Is melting of ice a reversible change?
विकल्प
True
False
उत्तर
True
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
How do you say that the process of digestion is a chemical change ?
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
Write true or false
Rusting of iron is a chemical change.
Write true or false
Decomposition of leaves is a fast change.
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
Give the main differences between physical changes and chemical changes.
What type of energy changes is associated when ice melts?
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
Give two examples for each of the following cases:
Physical changes are reversible.
