She boiled the ingredients as the recipe instructed. What kind of change is this? A. Physical change
B. Chemical change

Supongamos que estás estudiando dos estrellas. ambas estrellas tienen la misma magnitud aparente, pero la estrella a tiene una magnitud absoluta mayor que la estrella b. ¿que puedes decir acerca de la distancia a la tierra de estas dos estrellas?

  the mississippians were considered to be  horticulturalists, which means they were

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?