The collision of the molecules between the hydrogen molecule or H2, and an iodine molecule or I2, provided there would be a sufficient energy is that the system would eventually undergo a chemical change wherein a new chemical compound would be formed from these two molecules.
The change is that the water will freeze to 0 or minus I don’t know as I’m not to sure
B. It is the heat required to change a gram of substance from solid to liquid
More than one atom
- Hope this helps :)
