Reversible endothermic reaction

In summary, in the past, there were toys that contained a fluid and clip which, when pressed, would become hard and give off warmth. These toys could be reset by boiling them in water. Currently, there is no known reversible chemical reaction that produces cold instead of warmth. However, instant ice packs use endothermic reactions such as the dissolution of substances like ammonium nitrate or urea to quickly produce cold temperatures. It is uncertain if this reaction can be reversed.
  • #1
HansVh
1
0
hi,

In the past there were "toys" containing a fluid and a clip. When pressing the clip, the fluid became hard and it gave warmth. When the toy was boiled in water, it became fluid again and one could start over.

Now I was wondering of there is a chemical reaction that gives cold instead of warmth. If there is no such reversible reaction, what is a good endotherm reaction that creates cold quick and with à low temperature.
 
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  • #2
Instant ice packs generally use the dissolution of a substance like ammonium nitrate or urea as an endothermic reaction. Not sure if you could get this to happen reversibly, however.
 

Related to Reversible endothermic reaction

1. What is a reversible endothermic reaction?

A reversible endothermic reaction is a chemical reaction that absorbs heat from its surroundings, causing the temperature to decrease. In contrast to an exothermic reaction, which releases heat, a reversible endothermic reaction can also proceed in the opposite direction, releasing heat and increasing the temperature.

2. How do you know if a reaction is reversible endothermic?

A reaction is considered reversible endothermic if it absorbs heat from its surroundings, causing a decrease in temperature. This can be observed by measuring the change in temperature using a thermometer or by conducting the reaction in a calorimeter.

3. What factors affect the reversibility of an endothermic reaction?

The reversibility of an endothermic reaction can be affected by factors such as temperature, pressure, and the concentrations of reactants and products. Changes in these factors can shift the equilibrium of the reaction, causing it to either favor the forward or reverse reaction.

4. Can a reversible endothermic reaction reach equilibrium?

Yes, a reversible endothermic reaction can reach equilibrium. This is when the rates of the forward and reverse reactions are equal, and there is no net change in the concentrations of reactants and products over time. At equilibrium, the reaction is still occurring, but there is no observable change in the system.

5. How can reversible endothermic reactions be used in practical applications?

Reversible endothermic reactions have many practical applications, such as in refrigeration and air conditioning systems. These systems use reversible endothermic reactions to absorb heat from the surrounding environment, cooling the air or liquid. They are also used in chemical synthesis, where the reversibility of the reaction allows for control over the products formed.

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