Balancee las siguientes ecuaciones por el método del tanteo, haga la interpretación de la ecuación balanceada y compruebe que se cumple la Ley de Conservación de la Masa.

1.- Al+O2Al2O3 (15%)

2.- K2O + H2O KOH (10%)

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.