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प्रश्न
Define a chemical change. Give two examples of the above changes.
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उत्तर
A permanent change in which new substances are formed whose composition and properties are completely different from those of the original
substances.
Chemical change:
(i) Burning of wood.
(ii) Breathing.
संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
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.
Write short answer.
Sublimation is classified as a physical change. Why ?
Make a list of different types of changes with example.
What are man-made changes ?
Classify the following changes as physical or chemical.
What is a physical change ? Give two examples of physical changes.
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Classify the following as a physical or a chemical change.
Burning of coal
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
What will you take into account while identifying the following?
A chemical change in a substance.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Digestion of food is a physical change.
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
______ is the Universal Solvent.
Which of the following is a physical change?
A physical change is generally____________.
Give two examples for the following case:
Physical changes which are reversible
