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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
Fill in the blank.
A new substance is formed in a ............... change.
What is a chemical change ? Give two examples of chemical changes.
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Natural and man-made change.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
Select the chemical changes from the following list of changes
Respiration in mammals.
Sublimation of Iodine is a ______.
Mention a few physical properties of a substance.
