Advertisements
Advertisements
प्रश्न
What is a chemical change ? Give two examples of chemical changes.
Advertisements
उत्तर
Chemical change: These changes occur when a substance combines with another to form a new substance. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
Examples:
- Rusting of iron
- Burning of paper
APPEARS IN
संबंधित प्रश्न
Write true or false for the statement.
Burning of paper and formation of curd are reversible changes
How do you say that the process of digestion is a chemical change ?
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
State whether the following is physical or chemical changes.
water cycle in nature —
Write true or false
Melting of ice is a physical change.
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
Fill in the blank with the correct word of the statement given below:
Sublimation of iodine is an example of _________ change.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
