When you think about how temperature changes might show a chemical reaction is happening, a few key ideas come to mind.

Exothermic Reactions:

1. Heat Release:
   If you're mixing two substances and the mixture feels hot, that's usually a sign of an exothermic reaction.
   For example, when you mix quicklime with water, it gets warm. This shows that a chemical reaction is taking place!

Endothermic Reactions:
2. Heat Absorption:
On the other hand, if a reaction feels cold, it’s probably an endothermic reaction.
A common example is when ammonium nitrate dissolves in water. This process takes in heat and makes the solution feel cool.

Temperature Change Indicators:
3. Temperature Rise or Fall:
Check the temperature before and after mixing things. If there’s a big change, it might mean a reaction occurred.
For instance, the temperature might go up from 20°C to 40°C or drop from 20°C to 10°C, which suggests something has happened.

Overall, temperature changes can show important signs! Keep an eye on them when you’re looking for chemical reactions, whether in a lab or at home.
And remember, always be careful and wear the right safety gear when doing experiments!