Advertisements
Advertisements
प्रश्न
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
Advertisements
उत्तर
Magnesium is heated producing a bright light to form MgO in the air is a chemical change as the composition changes (MgO white powder) is formed, is irreversible. We cannot get magnesium back from MgO.
APPEARS IN
संबंधित प्रश्न
Write true or false for the statement
Decomposition of leaves is a fast change.
Name a chemical change which takes place in presence of:
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
Fill in the blank.
Growing of a seedling into a plant is _______ change.
Tick the most appropriate answer.
Physical changes are
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
Select the chemical changes from the following list of changes
The occurrence of lightning.
In a solution of salt in water, water is the solute
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
