Advertisements
Advertisements
प्रश्न
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Advertisements
उत्तर
Copper carbonate [CuCO3] green colour on heating gives copper oxide [Black colour CuO] and CO2.
Hence composition is changed new substances CuO [Black] and CO2 with new properties are produced and it is irreversible reaction hence it is a chemical change.
\[\ce{\underset{\text{Green}}{CuCO3} ->[\Delta] \underset{\text{Black}}{CuO} + CO2}\]
APPEARS IN
संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
Classify the following as chemical or physical change:
Making a fruit salad with raw fruits
Classify the following changes as physical or chemical: curdling of milk
Define physical change. Give two examples for the above changes.
Is burning a physical change or a chemical change? Why?
State whether the following is physical or chemical changes.
lightning —
True or false
Change of seasons is a non-periodic change.
State the various conditions that favour the process of evaporation.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :
- Sublimation.
- Fermentation.
- Liquefaction or condensation.
- Magnetization.
- Respiration.
