Question

Which best describes the total mass of substances before and after a

combustion reaction?
A. The mass is the same because atoms are not created or
destroyed.
B. The mass is greater after the reaction because the number of
atoms increases.
C. The mass is the same because the molecules do not change.
D. The mass is less after the reaction because gases are produced.

Answer 1

B. The mass is greater after the reaction because the number of

atoms increases.