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Mass Energy Equivalence

Radioactivity...

Question

Radioactivity occurs when the rest energy of the products is less than the rest energy of the reactants.

A

False

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B

True

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Solution

The correct option is B True

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Q. Assertion :In a decay process of a nucleus, the mass of products is less than that of the parent. Reason: The rest mass energy of the products must be less than that of the parent.

Q. Consider the following chemical equation for the combustion of methane.

C H_{4} + O_{2} \to C O_{2} + H_{2} O

Q. If the reactants are at a higher energy level than products, the reaction is exothermic. The activation energy of a forward reaction is less than that of the backward reaction. That means, the energy required for breaking of bonds is less than the energy released during formation of bonds. In case of an endothermic reaction, the activation energy of the forward reaction is more than that of backward reaction.

Consider the following chemical equation for the combustion of methane ( $C H_{4}$ )

$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

Q. Statement 1: An exothermic reaction has a negative value of

△ H

.
Statement 2 : In an exothermic reaction the products have less potential energy than the reactants.

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