Question

Heat is absorbed when glucose is dissolved in water true or false

Answer 1

Explanation:

C6H12O6(s) ---> C6H12O6(aq) is an endothermic reaction. This means that there is a net flow of energy from the water in order to convert the solid form of glucose into the dissolved form. This energy is being used to pull molecules apart while in the solid phase and convert them into the dispersed molecules of the aqueous phase.

 

Since the energy used has left the water, the temperature of the water goes down.

 

Another example of this is the dissolving of ammonium nitrate, NH4NO3

 

NH4NO3(s) ---> NH4^+(aq) + NO3^-(aq)

 

This reaction is te basis for a temporary cold pack, like might be used by a sports team. You slap the cold pack, breaking open a container of solid NH4NO3, which then dissolves in the water and makes the water be rather cold for several minutes (until it heats back up to room temp)

Answer 2

The statement "Heat is absorbed when glucose is dissolved in water" is True.

• The process of dissolving can vary the temperature of the solution either endothermic or exothermic.
• When water dissolves a substance, the molecules of water attract particles (molecules or ions) of the substance causing the particles to separate and be discrete from each other.
• So to break the bonds energy is used, while energy is released when water molecules form bonds to the discrete particles of the solute.
• If it takes a lot of energy to separate the particles of the solute then is freed when the water molecules bond to the particles making the reaction energy absorb, then the temperature goes down.
• While if less energy is needed to separate the particles of the solute then is freed when the water molecules bond to the distinct particles making the reaction energy release then the temperature goes up.

In this case, when Glucose is dissolved in water it needs little heat to dissolved and which it takes from the water itself.

Hence, the temperature of the water drops a little and becomes cold.