Clasifica los hechos o actos siguientes como cambios quimicos o fisicos:a. Prender un encendedor de butanob. La expansion del agua al congelarsec. la evaporación de alcohold. El enmohecimiento de un clavo de hierro

What is the formula that this ionic compounds could form sr2+p3-o2-

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

Which sample at stp has the same number of atoms as 18 liters of ne at stp