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प्रश्न
Give two examples of periodic changes.
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उत्तर
Swinging of a pendulum
Rising and setting of the sun.
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संबंधित प्रश्न
Write short answer.
Give two examples of periodic changes
Write short answer.
Sublimation is classified as a physical change. Why ?
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
Classify the following as a physical or a chemical change.
Boiling of water
What will you take into account while identifying the following?
A physical change in a substance.
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.
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.
What type of change is colouring of a paper?
Iron pipes coated with zinc do not get rusted easily.
