GCSE CHEMISTRY: Endothermic Reaction HelpWatch
It explains it really well here with an animation
Yeah you're right the surroundings' temperature decreases. I understand this as energy is taken in from them. What I don't understand is how the temperature of the mixture decreases if it gains energy?
did the website or video or whatever say that the mixture decreases???
Yes, because energy is taken in the energy of the surroundings decreases, have you got onto endothermic calculations yet? That has a positive or negative answer relating to the type of reaction
"The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to get colder." BBc bitesize says this.
If something is exothermic, it means that heat is transfering from the inside to the outside.
That's why something will feel hot if you touch it, because all that heat is being applied to your receptors on your hand, or whatever instrument you use.
If something is endothermic, it means the heat is transfering from the outside to the inside.
That's why something will feel cold if you touch it, because it's drawing the heat away from your hand, or instrument.
The actual substance itself is going to be cold (exothermic) or hot (endothermic).
You're right that if a substance is absorbing energy, it should feel hotter, but the temperature measured is the transfer of heat energy from the medium we use to measure, whether it'd be our hand or a temperature.