Either Exothermal or Endothermal.
Chemcal
You would have to have an Eacthomatdid reaction of chemcal chance to change a cold pack to a hot pack.
Chemical reactions take place in various cell organelles. For example, in mitochondria, reactions like cellular respiration occur to produce energy. In the nucleus, reactions like DNA replication and transcription occur. And in the cytoplasm, reactions like protein synthesis take place.
To get stability.
potassium thiocyanate
Europium
The property that involves how a substance interacts with other substances is known as chemical property. This is what will cause chemical changes during reactions.
color change and release of heat and light
It contains a CANCER chemcal!
Two or more chemcal elements combined in constant proportions.
Usually its the changing of the colour but in some cases it can be different.
No. That is a physical change.