Color change
new substance formed
heat or light change
new smell
irreversible
The combining of hydrogen and oxygen gas into liquid=H2O (water) is a compound or a molecule because it is 2 different elements combined with chemical bonds so its Chemical. B
<span>A full valence electron shell.</span>
Answer:
letter A. i hope this is correct answer
Yes..? I don’t understand what you’re trying to ask mate.
