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प्रश्न
What will you take into account while identifying the following?
A chemical change in a substance.
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
Classify the following as chemical or physical change:
Cutting of trees
Classify the following changes as physical or chemical: curdling of milk
How do you say that the process of digestion is a chemical change ?
State four differences between physical and chemical changes.
Write true or false
Burning of sugar is a temporary change.
Tick the most appropriate answer.
Physical changes are
Given reason:
Burning of paper is a chemical change.
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
What will you take into account while identifying the following?
A physical change in a substance.
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then a small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are:
