Advertisements
Advertisements
प्रश्न
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Advertisements
उत्तर
Carbon dioxide and water cannot be obtained back from glucose and oxygen hence it is a chemical change.
APPEARS IN
संबंधित प्रश्न
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Is burning a physical change or a chemical change? Why?
Which of the following are physical changes and which are chemical changes ?
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.
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Select the chemical changes from the following list of changes
Rotting of eggs.
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
Select the correct answer from the choice given below to complete the sentence
The dissolution of lead nitrate in water is deemed as a _________ change.
In a solution of salt in water, water is the solute
