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प्रश्न
When ice melts to form water, change occurs in its
विकल्प
position
colour
physical state
composition
उत्तर
Physical state
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संबंधित प्रश्न
Fill in the blank.
A new substance is formed in a ............... change.
A physical change is temporary. Explain.
Fill in the blank
Revolution of the earth around the sun is a ________ change.
State whether the following is physical or chemical change.
Digestion of food —
Write true or false
Burning of sugar is a temporary change.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Which of the following are physical changes and which are chemical changes ?
Freezing of water
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
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.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
