Question

Which of these describes an exothermic reaction?

a. energy is created in the reaction
b. energy is released by the reaction
c. energy is absorbed by the reaction
d. no energy is transferred by the reaction.

Answer 1

B. energy is released by the reaction

Exothermic reactions release heat
ENDOthermic absorbs heat

Answer 2

Answer: correct option is B. Energy is released by the reaction

Explanation:

The exothermic reactions are the reactions in which energy is released.The released energy can be in the form of heat or light.

Temperature of the surrounding also increases.

For example:

• Neutralization reaction between acid and base.

`HCl+NaOH\rightarrow NaCl+H_2O`

Above reaction takes place in the aqueous medium.After the reaction mixtures becomes hot.

• Burning of Magnesium ribbon

`Mg(s)+O_2\rightarrow MgO`

In above reaction energy is released in the form light.