Na chemical reaction, the total mass of the reactants is 10.0 grams. after the reaction, the total mass of the products must be: exactly 20.0 grams. more than 10.0 grams. less than 10.0 grams. exactly 10.0 grams.

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.