What Are Endothermic & Exothermic Reactions | Chemistry | FuseSchool

What Are Endothermic & Exothermic Reactions | Chemistry | FuseSchool
An exothermic reaction gives off energy to the surroundings; like a fire giving off heat. An endothermic reaction takes in energy from the surroundings; like a snowman melting.
Exothermic reactions transfer energy to the surroundings, and this energy is usually heat energy, they cause the surroundings to heat up. Just like a bonfire keeping everyone warm.
As well as combustion (burning), other examples of exothermic reactions are:
- Neutralisation reactions between acids and alkalis
- The reaction between water and calcium oxide
- Respiration.
It is easy to detect an exothermic reaction - just get your thermometer and see if the temperature increases. Most chemical reactions are exothermic, because heat is given out.
Physical processes can also be endothermic or exothermic. When something freezes, it goes from liquid to solid. Bonds need to be made for this to happen, and to make bonds you need to do some work, thus energy is given out and freezing is exothermic.
Similarly, when condensation happens - because a gas is going to liquid, again bonds need to be made and so energy is given out. So freezing and condensation are exothermic. Because in exothermic reactions, energy is given out to the surroundings. This means that the energy of the reactants is higher than the energy of the products.
Endothermic reactions are less common. They take in energy from the surroundings. The energy being transferred is usually heat. So in endothermic reactions, the surroundings usually get colder.
Some examples of endothermic reactions are:
- Electrolysis
- The reaction between sodium carbonate and ethanoic acid
- Photosynthesis.
Endothermic reactions can also be seen in physical processes. When something melts it goes from a solid to a liquid. For this to happen, bonds need to be broken. And to break bonds, energy needs to be put in. Boiling is also endothermic because energy needs to be put in to break the bonds for the liquid to turn to gas. Because in endothermic reactions, energy is added to the reaction, the energy of the products is higher than the energy of the reactants. And again, we can detect endothermic reactions with a thermometer because the temperature would get colder.
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*Thanks a lot man* 😉 .
These reactions has always been a lot confusing 🤦🏻‍♂️
*Exo -* gives out the E and makes the surrounding hotter .
*Ex-* Respiration , Bonfire
*Endo -* takes in the E and makes the surrounding colder .
*Ex-* Photosynthesis 👍

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So...temperature increases in exothermic and temperature decreases in endothermic??? Am I right or wrong

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@@P0P0_xyz288 to strengthen our concept, we should determine it is from system or surrounding.
Exothermic is condition where surrounding is heater and the system is colder. There is temperature gain in surrounding cause the system is disengage calor.

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what happens to the system during an exothermic reaction, my teacher said it becomes hotter but i don't understand that because the system in giving out heat so shouldn't it cool down?

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If temperature goes down in endothermic reactions then why does the temperature increases while melting or boiling?

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could someone explain the chemical reaction for freezing what are the products and reactants

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1:11 why would the temperature of the substance increase if heat is lost?

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Temperature of substance increases because heat is lost ( given out ) to the surroundings.

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The graphs we learned at school for this were a bit different. The line connecting the reactants and products is slanted rather than curved like that.

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Can you please explain me how you say boiling is an endothermic reaction. As you said before, endothermic are the ones which takes energy, how the boiling is taking energy by turning liquid into gas? Isn't it releasing the energy and temperature is increase; how this isn't called an exothermic reaction?

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Wait Endo is taking in heat from surrounding, so on a thermometer wouldn't it be increasing in temperature because it's taking in energy = heat?

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Craft Avrila yes, but only if you are trying to describe the thermometer’s status. We are trying to figure out whether or not the reaction is endo or exothermic. Since it is releasing energy that the thermometer absorbs, it’s exothermic in nature

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How is it possible that a substance gives out heat and it’s temperature rises.shouldnt the temperature decrease in a exothermic reaction?

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why is boiling water a reaction?