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Question
Write true or false
Deforestation is a man-made change.
Options
True
False
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Solution
True
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RELATED QUESTIONS
Write true or false for the statement
A natural change can also be a desirable change
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
Differentiate between a physical change and a chemical change with reference to – Formation of products.
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 chemical changes from the following list of changes
The carbon cycle.
Select the correct answer from the choice given below to complete the sentence
The matter is added or removed during a ____________ change.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
Adding sugar to milk is a physical change.
