Question

the way we measure the amount of matter in a sample is by using a balance to find its
_________________________ in grams. since atoms are not created or destroyed in a
physical or chemical change, mass cannot be created or destroyed. we say that matter,
and therefore mass, is conserved, meaning that the total mass will remain
_________________________, even as matter undergoes changes.

now, lets investigate the conservation of mass and develop an explanation for how a big
log can turn into a tiny pile of ash when it burns. where does all the mass go?

Explanation:

Para la primera línea en blanco, la forma de medir la cantidad de materia en una muestra usando una balanza es encontrar su masa en gramos. Para la segunda línea en blanco, la ley de conservación de la masa establece que la masa total permanece constante (o "la misma") durante cambios físicos o químicos.

Answer:

Primera línea en blanco: masa
Segunda línea en blanco: constante (o "la misma")