Question

A student is trying to develop a model of an instant heat pack. What is the essential characteristic of the chemical reaction that the student should
use to develop the heat pack?
O A The standard enthalpy of reaction should be zero.
о В.
The standard enthalpy of reaction should be negative.
OC. The enthalpy of formation of reactants should be positive.
D. The enthalpy of formation of products should be negative.

Answer 1

The standard enthalpy of reaction should be negative.

What is enthalpy?

A thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.

Inside the heat pack are two chemicals that get mixed when you smush them together. As they mix, some weak bonds are broken, which takes a little bit of energy. But new, stronger bonds form which release energy. Releasing that energy causes the surroundings to heat up.

Hence, option B is correct.

Learn more about enthalpy here:

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