Advertisements
Advertisements
प्रश्न
State whether the following is physical or chemical changes.
water cycle in nature —
Advertisements
उत्तर
physical change,
APPEARS IN
संबंधित प्रश्न
Dissolving salt in water is a reversible change.
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 3. a change that is made by humans | c. physical change |
| 4. a change in which the original substance cannot be obtained | d. periodic change |
| 5. a change where no new substance is formed | e. irreversible change |
| f . slow change |
Photosynthesis cannot take place at night.
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Distinguish physical and chemical changes.
______ is the substance that is dissolved in a solvent.
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
