GMAlL
contestada

_______________ cannot be gained or lost during a reaction, only transformed.

A. Air
B. Matter
C. Electricity
D. Reactants

Respuesta :

matter is the definite answer for this one.
Matter cannot be gained or lost during a reaction, only transformed.

- - -
This is the Law of Conservation of Mass, created by Antoine Lavoisier.
RELAXING NOICE
Relax