1. massive amounts of destructive energy are released when a nuclear fission bomb explodes. where does that energy come from?

a. a chain reaction occurs when uranium atoms split, releasing nuclear energy.

b. hydrogen atoms fuse together into helium, releasing nuclear energy.

c. molecules break down, releasing chemical energy.

d. molecules are created, releasing chemical energy.

A. A chain reaction occurs when uranium atoms split, releasing nuclear energy.

Explanation: Nuclear fission reactions are those nuclear reactions in which heavier nuclei splits into two or more lighter nuclei. In these reactions, neutrons are released with a large amount of energy.

General equation for nuclear fission reactions is given by

The released 3 neutrons further react with remaining uranium atoms and thus a chain reaction sets up.

the answer is b, have negligible mass