Cual es la diferencia entre un espectro de luz y un espectro de gas

When hydrochloric acid reacts with potassium hydroxide solution, the following reaction occurs. hcl (aq) + koh (aq) h2o (l) + kcl (aq) the reaction gives off heat energy, so it is an reaction.

The identities of substances are the same before and after which type of change

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years