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प्रश्न
What do you observe when :
a spoon of sugar is heated in a pan
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उत्तर
When a spoon of sugar is heated in a pan, black (charred sugar) (carbon) is seen. Is a chemical change.
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संबंधित प्रश्न
What do you observe when :
solid ammonium chloride is heated
True or false?
During a physical change energy is either given out or absorbed by the system.
Fill in the blank
An earthquake is a _______ change.
What role does energy play in initiating a chemical change ?
Distinguish between the following.
Natural change and man-made change
Give reason.
A dry handkerchief gets wet at once on dipping in water, but it takes longer for a wet handkerchief to dry.
Explain in brief the involvement of energy in physical and chemical changes.
Fill in the blank with the correct word of the statement given below:
Ammonium chloride, a sublimable solid undergoes _________ on heating.
Picture based question
Observe the picture and list down the changes that are accompanied in the picture.
- ______.
- ______.
- ______.
Observe the picture containing a kettle and note that it has salt water in it and answer the following questions:
- What is name of the process that is done to the kettle?
- What will happen to the content of the kettle?
- What kind of change is occurring on the cold surface of the metal plate?
- What can you say about the quality of water that is obtained in the beaker?
