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प्रश्न
Select the chemical changes from the following list of changes
Breaking of glass
उत्तर
Breaking of glass is a PHYSICAL change as no change in composition takes place, no new substance is formed.
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संबंधित प्रश्न
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Photosynthesis cannot take place at night.
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
True or false
Change of seasons is a non-periodic change.
Tick the most appropriate answer.
Photosynthesis requires
Sublimation is classified as a physical change. Why ?
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Classify the Following as a Physical Or a Chemical Change.
Formation of Clouds
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :
- Sublimation.
- Fermentation.
- Liquefaction or condensation.
- Magnetization.
- Respiration.
