03. El óxido de magnesio (Mgo) es uno de los principales componentes en la fabricación de refractarios básicos, se obtiene a través del calentamiento del carbonato de magnesio
(MgCO3):
MgCO3() → MgO(s) + CO2(g)
Si se desea obtener 304 g de óxido de magnesio, ¿qué cantidad de carbonato de
magnesio con una pureza de 76% se deberá emplear?

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.