Something To Do
1. Solve the puzzle with the help of clues given below:
Across →
a. A change which cannot be reversed.
b. A metal which gets rusted.
f.
An example of a chemical change in which energy is released.
Down
A change in which original condition can be re-attained.
d. The change which takes place in long duration of time.
e. A reversible change involving change of liquid into gas.
Answers
Answer:
a. Chemical Change
b. Iron
d. Slow Change
e. Vaporization
f. Burning of a flame
Explanation:
a. Chemical changes are changes such that in most cases, a new substance, or energy is formed. They are also irreversible, meaning, once the change has happened, it is impossible to return to the original state.
b. Rusting is a process which happens due to the amount of oxygen along with the amount of water (vapour) present in the air. Iron and alloys containing iron are the only metals to experience rusting yet.
d. Slow change, it's a pretty obvious explanation.
e. The process of the change of liquid matter into gaseous matter is known as vaporization. This process is used here
f. Burning of a flame is an excellent example of chemical change. Once the fuel is burnt, it cannot be reversed into it's original form. Whenever a flame is present, smoke is given off as a new substance and heat energy is also produced
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