Reaction Energy
Mendeleev
Periodni sustav · chemistry · physics
How to use this page
Start from what you can observe, then connect it to the model scientists use.
Look for one measurable consequence: a colour change, a temperature change, a spectrum, a pressure, a mass or a time.
How to use this page
A model is useful because it explains and predicts. It is not a literal photograph of nature.
How to use this page
Riješeni primjer
ΔH=H₂−H₁=80−120=−40 kJ
Provjera: Uvrsti vrijednosti, zadrži jedinice i provjeri ima li rezultat fizičkog smisla.
Vježba
Odgovor:
ΔH<0 ; ΔH>0