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प्रश्न
Fill in the blank.
The reaction in which energy is evolved is called
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उत्तर
The reaction in which energy is evolved is called exothermic reaction.
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संबंधित प्रश्न
Solve this crossword by using the clues that follow.
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
What are reversible and irreversible changes ? Give one example for each.
State whether the following is physical or chemical changes.
glowing of a bulb -
True or false
Change of seasons is a non-periodic change.
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
Distinguish between the following.
Physical change and chemical change
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered a ___________ change.
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Select the chemical changes from the following list of changes
Glowing of an electric bulb.
