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Question
Name the following.
A form of energy required for a chemical change.
Solution
Generally, HEAT ENERGY is required but light, pressure, or electricity can also be needed.
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RELATED QUESTIONS
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
Name a chemical change which takes place in presence of:
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
Write true or false
Burning of sugar is a temporary change.
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
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.
Natural and man-made 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.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think rust is different from iron?
