Advertisements
Advertisements
प्रश्न
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
पर्याय
True
False
Advertisements
उत्तर
This statement is True.
Explanation:
When a candle burns, both physical and chemical changes occur:
-
Physical Change: The wax of the candle melts due to the heat of the flame. This is a reversible change as the wax can solidify again when cooled.
-
Chemical Change: The wax undergoes combustion, reacting with oxygen in the air to form carbon dioxide and water vapour. This is an irreversible chemical reaction.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
A new substance is formed in a _______ change.
State four conditions necessary for a chemical reaction to take place.
Give an example of the following chemical changes.
A reaction where colour change is noticed.
Name: Two nitrates that do not produce nitrogen dioxide on heating.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Zinc carbonate.
Limestone contains ______ mainly.
______ change results in the change of the substance.
Write the equation for the process of formation of rust.
Write a note on the catalyst.
