A thermometer is in a beaker of water. Which statement best explains why the thermometer reading initially increases when LiBr(s) is dissolved in the water?

(1) The entropy of the LiBr(aq) is greater than the entropy of the water.

(2) The entropy of the LiBr(aq) is less than the entropy of the water.

(3) The dissolving of the LiBr(s) in water is an endothermic process.

(4) The dissolving of the LiBr(s) in water is an exothermic process.

The statement best explains why the thermometer reading initially increases when LiBr(s) is dissolved in the water is the dissolving of the LiBr(s) in water is an exothermic process.

What is a thermometer?

A thermometer is an instrument that is used to measure the temperature of an object.

An exothermic process is in which the heat and energy is released in the outer system.

Thus, the correct option is (4) The dissolving of the LiBr(s) in water is an exothermic process.

Learn more about thermometer

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