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A teacher demonstrates a chemical reaction. A student
observes that the test tube in which the reaction occurs
becomes warm. What is the source of the thermal
energy generated by the reaction?

Select one:

A. potential energy absorbed by the reaction

B. breaking bonds of the reactants

C. kinetic energy absorbed by the reaction

D. energy stored in the reactants

Respuesta :

KiaraL2006

Answer: B, breaking bonds of the reactant.

Explanation:

This reaction is taking in energy and we know this because it says it 'becomes warm'.

Endothermic reactions take in heat/energy from the surroundings and bond breaking occurs during an endothermic reaction.

B. breaking bonds of the reactants which emits heat energy.

The test tube in which the reaction occur is warm because the heat energy is released due to the making of new bonds. When the new bonds are formed, energy is released in the form of heat.

Energy is needed to break bonds so it absorbed the bonds so we can say that bond-breaking is an endothermic process while on the other hand, energy is released when new bonds form so we can say that bond-making is an exothermic process.

Learn more: https://brainly.com/question/21673928

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