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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[onsetss]

who else is here from online school?
⬇

[ludwigvanbeethoven]

I'm glad we have teachers like this in a crisis like this.

[bunniicown_tth]

Thank you for this video I have an assessment soon and this going to help me a lot!

[asadrking]

Great video this was very clear, graphics were great, and it was simple.

[maymoosomin]

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

[puravsanghavi]

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

[clyna]

Your video helped me a lot! Thank you soo much.

[adri]

So if the temperature of the solution is getting low, then it's exothermic?

[ShivCreates]

Lol why did this pop up when I searched for changes by Justin Bieber 😬😬😬 btw I made a reaction video on my channel too

[dont_bother]

i have a question why does magnesium release more energy than potassium when they react with water although potassium is on top of the reactivity series

[zacharymiller]

Yet he explains something that takes teachers a WEEK to explain

[bottlegang]

Basically, exo gives out, endo takes in.

[Reedanimzthestupe]

What takes my teachers a week to explain

this video takes 4 min
Why r schools so complicated
Exp algebra i have a way of solving equations easy way
My teacher makes it harder

[Kjminer]

my brain has expanded to accomodate the knowledge and that means that i now have a BIG BRAIN. thank you so much .

[greenjars_]

I rememeber Endothermic and Exothermic by Enter (Endo) and Exit (Exo). I find it much easier.

[lilchwis]

Whoa! This science video was actually really helpful and easy to understand. Most science videos aren't like this! Keep up the good work!

[sumitadey]

How many of your exams are closer and you still haven't understand the topic and taking help from internet? Anyways I get it now

[KALKIATOR]

*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 👍

[Tommykee]

Please keep making vids
Really appreciate it

[tulikanahar]

Like the video but your voice is so quiet! I had troubles listening even when the volume was full. Thanks for the video tho.