What Are Endothermic & Exothermic Reactions | Reactions | Chemistry | FuseSchool


In this video we are going to look at exothermic and endothermic reactions. So what are they [how] are they different? What about their energy levels in the next couple of minutes you’ll know everything you need to get started An exothermic reaction gives off energy to the [surroundings] like this fire giving off heat Whereas an endothermic reaction takes in energy from its surroundings like this pool melting snowman taking in the heat just remember Exo means external so giving out an Endo means internal so taking in let’s start by having a quick look Because 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 Other examples of exothermic reactions are the neutralization reactions between acids and alkalis? the reactions between water and calcium oxide and respiration It is easy to detect exothermic reactions. Just get your thermometer and see if the temperature increases Watch the hydrochloric acid and sodium hydroxide solution being mixed and see how the fellow meter increases most chemical reactions are exothermic Because heat is given our 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 both exothermic Because in exothermic reactions energy is given out [to] the surroundings This means that energy of the reactants is higher and the energy of [the] products hence the energy curve For the exothermic reactions will look like this now [let’s] have a look at endothermic reactions. These are less common Remember that endothermic reactions take in energy from the surroundings Again as with exothermic reactions the energy being transferred is usually [heat] So in endothermic reactions the surroundings usually get colder Again, we can detect endothermic reactions with a thermometer because the temperature would get colder some examples of endothermic reactions are electrolysis the reaction between sodium Carbonate and ethanoic acid and photosynthesis Endothermic reactions can also be seen in physical processes where something melts it goes from a solid to a liquid For this to happen bonds need to be broken and to break bonds energy to be put in like our melting snowman 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 So the energy curve looks like this, so there you have exothermic and endothermic reactions all you need to remember is that exothermic reactions give out energy and endothermic reactions take in energy both can be detected with a thermometer in Exothermic reactions the surroundings get hotter and in endothermic reactions the surroundings get colder exothermic reactions start with more energy and end with less while endothermic reactions start with less energy and end with more Freezing and condensation are exothermic because bonds need to be made which gives out energy Melting and boiling are endothermic because bonds are broken which requires additional energy think of the [snowman] again and finally Exothermic reactions are more common

75 thoughts on “What Are Endothermic & Exothermic Reactions | Reactions | Chemistry | FuseSchool”

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

  2. thank you fuse school tomorrow is my exam and by you i can able to know about endo and exo thermic reaction and now i am not having any confusion about it

  3. Thank you for the help of this video. I was so confused but now im much more confident in this topic. Hope to see more of your amazing videos

  4. Okay, so the thing that is bothering me is the fact that endothermic reaction will cause the reactants to drop in temperature. By definition, endothermic means taking in energy from the surrounding usually in the form of heat energy and this can be seen by the drop of temperature in the surrounding. Alright, let's look at it in the form of melting. Heat is taken in by the reactant which is the ice to melt, so wouldn't the ice gain heat energy causing its temperature to rise? But in this case, the proper answer would be an endothermic reaction will cause the reactant's temperature to drop. It doesn't make sense. It's like comparing it to money and a wallet. Let's take it that the money is the energy and the wallet is the reactant. So the money will be placed inside the wallet right, since it is an endothermic reaction. As a result, the wallet, which is the reactant will have an increase in money which is the energy. This is a similar scenario. It just doesn't seem to make sense to me.
    Hence, could any kind-hearted science enthusiast out there care to explain to me of my issue? Thank you in advance.

  5. one time watching this already gave me so much knowledge and i do not even need to memorize them. your explanation is so clear and on point! thanks! (thumbs up)

  6. I get that, yes.

    But it doesnt really help… e.g
    How can I see if i get a reaction… theoretically. Ni + 4 CO == Ni(CO)4
    And i have to explain if it is endo or exo?

  7. I'm studying Chemical Kinetics and Equilibrium and your video is helping me to understand those subjects. Thank you so much!

  8. Cooking food is a very common endothermic chemical reaction. Saying that endothermic reactions are less common is misleading to students.

  9. What would happen if an endothermic reaction happens inside a powerful vacuum one where no light or heat is in, since an endothermic reaction needs surrounding particles for energy, so If put in the most powerful vacuum made which can have a minimum of 60-100 particles in it, so when the reaction takes place and uses all the particles around it, after a while wouldn’t it become exothermic? Since it is the only thing with energy and particles within the chamber.

  10. Thank You for this. It definitely helped me with all the examples that you have. This video is highly appreciated😊

  11. But water is absorbing cold that makes it endo. Water does not release energy when it turns to ice.🤷🏻‍♂️

  12. 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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