Due to water, cement hardens and its composition changes. Since it is a chemical change which cannot be reversed. https://www.tiwariacademy.com/ncert-solutions/class-6/science/chapter-6/
Due to water, cement hardens and its composition changes. Since it is a chemical change which cannot be reversed.
When water is added to POP, it undergoes a chemical change. Its composition changes and is converted into another substance. Since it is a chemical change, so it cannot be reversed. https://www.tiwariacademy.com/ncert-solutions/class-6/science/chapter-6/
When water is added to POP, it undergoes a chemical change. Its composition changes and is converted into another substance. Since it is a chemical change, so it cannot be reversed.
Examples of Reversible Changes: • Melting of Ice into water. By freezing the water we can obtain ice again. • Folding a paper: By unfolding it, we can undo the change. • Hot milk to cold milk: By boiling milk, we can make it warm. Example of Irreversible Changes: • Burning of candle. • Bursting of cRead more
Examples of Reversible Changes:
• Melting of Ice into water. By freezing the water we can obtain ice again.
• Folding a paper: By unfolding it, we can undo the change.
• Hot milk to cold milk: By boiling milk, we can make it warm.
Example of Irreversible Changes:
• Burning of candle.
• Bursting of crackers.
• Cutting of trees.
It is all depends on situations: • By erasing the drawing we can undo the change. For example, if we draw with the help of pencil, we can erase the drawing by using an eraser. Then, it is a reversible change. • If we draw using a pen, we cannot erase the drawing. Then this change cannot be reversed,Read more
It is all depends on situations:
• By erasing the drawing we can undo the change. For example, if we draw with the help of pencil, we can erase the drawing by using an eraser. Then, it is a reversible change.
• If we draw using a pen, we cannot erase the drawing. Then this change cannot be reversed, so it is irreversible change.
Can you find a plant in your house or in your neighborhood, which has a long but a weak stem? Write its name. In which category would you classify it?
Money Plant has a ling but weak stem. It is a climber. https://www.tiwariacademy.com/ncert-solutions/class-6/science/chapter-7/
Money Plant has a ling but weak stem. It is a climber.
https://www.tiwariacademy.com/ncert-solutions/class-6/science/chapter-7/
See lessA bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Due to water, cement hardens and its composition changes. Since it is a chemical change which cannot be reversed. https://www.tiwariacademy.com/ncert-solutions/class-6/science/chapter-6/
Due to water, cement hardens and its composition changes. Since it is a chemical change which cannot be reversed.
https://www.tiwariacademy.com/ncert-solutions/class-6/science/chapter-6/
See lessA thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
When water is added to POP, it undergoes a chemical change. Its composition changes and is converted into another substance. Since it is a chemical change, so it cannot be reversed. https://www.tiwariacademy.com/ncert-solutions/class-6/science/chapter-6/
When water is added to POP, it undergoes a chemical change. Its composition changes and is converted into another substance. Since it is a chemical change, so it cannot be reversed.
https://www.tiwariacademy.com/ncert-solutions/class-6/science/chapter-6/
See lessGive examples to explain the difference between changes that can or cannot be reversed.
Examples of Reversible Changes: • Melting of Ice into water. By freezing the water we can obtain ice again. • Folding a paper: By unfolding it, we can undo the change. • Hot milk to cold milk: By boiling milk, we can make it warm. Example of Irreversible Changes: • Burning of candle. • Bursting of cRead more
Examples of Reversible Changes:
• Melting of Ice into water. By freezing the water we can obtain ice again.
• Folding a paper: By unfolding it, we can undo the change.
• Hot milk to cold milk: By boiling milk, we can make it warm.
Example of Irreversible Changes:
• Burning of candle.
• Bursting of crackers.
• Cutting of trees.
https://www.tiwariacademy.com/ncert-solutions/class-6/science/chapter-6/
See lessA drawing sheet changes when you draw a picture on it. Can you reverse this change?
It is all depends on situations: • By erasing the drawing we can undo the change. For example, if we draw with the help of pencil, we can erase the drawing by using an eraser. Then, it is a reversible change. • If we draw using a pen, we cannot erase the drawing. Then this change cannot be reversed,Read more
It is all depends on situations:
• By erasing the drawing we can undo the change. For example, if we draw with the help of pencil, we can erase the drawing by using an eraser. Then, it is a reversible change.
• If we draw using a pen, we cannot erase the drawing. Then this change cannot be reversed, so it is irreversible change.
https://www.tiwariacademy.com/ncert-solutions/class-6/science/chapter-6/
See less