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Question
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
Options
released
absorbed
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Solution
The energy required for completion of a physical change is released when the change is reversed.
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RELATED QUESTIONS
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 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 formade | e. irreversible change |
| f. slow change |
Tick the most appropriate answer.
Photosynthesis requires
Classify the Following as a Physical Or a Chemical Change.
Formation of Clouds
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Select the chemical changes from the following list of changes
Glowing of an electric bulb.
Physical Change: Boiling::Chemical Change: ______.
Give two examples for the following case:
Physical changes which are not reversible
