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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 |
Concept: undefined >> undefined
Write true or false for the statement.
Burning of paper and formation of curd are reversible changes
Concept: undefined >> undefined
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Write true or false for the statement
A natural change can also be a desirable change
Concept: undefined >> undefined
Write true or false for the statement.
Deforestation is a man-made change
Concept: undefined >> undefined
Write true or false for the statement
Decomposition of leaves is a fast change.
Concept: undefined >> undefined
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Concept: undefined >> undefined
Dissolving salt in water is a reversible change.
Concept: undefined >> undefined
Ripening of fruits is a desirable change.
Concept: undefined >> undefined
Melting of solid (wax) is a physical change.
Concept: undefined >> undefined
Chemical changes are accompanied by changes in energy.
Concept: undefined >> undefined
Photosynthesis cannot take place at night.
Concept: undefined >> undefined
Write short answer.
Name two reversible changes.
Concept: undefined >> undefined
Write short answer.
Give two examples of periodic changes
Concept: undefined >> undefined
Write short answer.
Give an example of desirable change which can also be undesirable
Concept: undefined >> undefined
Write short answer.
What are man-made changes ?
Concept: undefined >> undefined
Write short answer.
Sublimation is classified as a physical change. Why ?
Concept: undefined >> undefined
Classify the following changes as physical or chemical: curdling of milk
Concept: undefined >> undefined
A physical change is temporary. Explain.
Concept: undefined >> undefined
State the differences between a physical change and a chemical change.
Concept: undefined >> undefined
State the various conditions that favour the process of evaporation.
Concept: undefined >> undefined
