Color change
new substance formed
heat or light change
new smell
irreversible
Answer:
Explanation:
element - a basic substance that can't be simplified (hydrogen, oxygen, gold, etc...) molecule - two or more atoms that are chemically joined together (H2, O2, H2O, C6H12O6, etc...) compound - a substance that contains more than one element (H2O, C6H12O6, etc...)
5 is 2 I’m not sure about 4 though....
Answer:
The excited state electron configuration of an atom indicates the promotion of a valence electron to a higher energy state.