Question

NEED HELP FAST PLEASE!!!!
Nuclear fission chain reactions do not naturally occur for a couple of reasons. One reason is that uranium-235 atoms are not found in large concentrations. Engineers counteract this with what process?
a. Containment
b. Proton bombardment
c. Enrichment
d. Uranium-235 modification

Answer 1

Enrichment is the process of increasing the concentration of uranium-235 atoms in nuclear fuel so a chain reaction is more likely to occur. C.

Answer 2

Engineers overcome this difficulty by:
C. Enrichment
Enrichment is a process through which the isotopes of uranium are separated. Naturally, there are two isotopes of uranium; uranium-238 and uranium-235
The isotopes are separated via centrifugation and concentrated uranium-235 is obtained.