1-Hallar la densidad de un trozo de madera cuya masa es de 80 gramos y ocupa un volumen de 90 mililitros

Idon’t know how to solve this question

Energy defines the different "states" of matter. in no more than 3 sentences, describe the amount of kinetic energy that each of the 3 states of matter possesses and relate that to the atom/molecular motion of each "state".

Areaction in which products can react to re-form reactants is