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प्रश्न
What will you take into account while identifying the following?
A chemical change in a substance.
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उत्तर
Chemical changes are changes that involve the reaction of substances with one another. Such reactions result in alterations in the chemical compositions of the substances involved. These changes lead to the formation of new substances.
Characteristics:
- One or more new substances are formed during a chemical change.
- Most chemical changes cannot be reversed easily.
- The chemical composition of a substance undergoing chemical change does not remain the same.
- A chemical change is always accompanied by a change in energy.
संबंधित प्रश्न
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Classify the following changes as physical or chemical.
State the Differences Between a Physical Change and a Chemical Change.
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
A physical change is generally____________.
Iron pipes coated with zinc do not get rusted easily.
