Reaction Energy
Mendeleev
Периодична таблица · chemistry · physics
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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
Решен пример
ΔH=H₂−H₁=80−120=−40 kJ
Проверка: Замести стойностите, запази мерните единици и провери дали резултатът има физичен смисъл.
Упражнение
Отговор:
ΔH<0 ; ΔH>0