Answer:

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The key difference between controlled and uncontrolled chain reactions is that controlled chain reactions do not lead to any explosive effects whereas uncontrolled chain reactions lead to explosive energy release.

:::Controlled vs Uncontrolled Chain Reaction::::::

(1)A controlled chain reaction is a chain of nuclear reactions that take PLACE SUBSEQUENTLY under controlled conditions.

An uncontrolled chain reaction is a chain of nuclear reactions that take place subsequently, but not under controlled conditions. 

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(2) Components::::A controlled chain reaction is CARRIED out in the presence of MODERATORS.

An uncontrolled chain reaction is carried out in the absence of moderators.

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(3) Control Measures::::A nuclear chain reaction is converted into a controlled chain reaction via regulating the amount of fissile isotopes present, reducing the time of reaction and using moderators.

An uncontrolled chain reaction has no control measures.

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(4) Applications::::Controlled chain reactions are used in nuclear power plants to generate electricity.

Uncontrolled chain reactions are used in nuclear bombs.

Explanation:

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