What does a fission reaction require to be sustainable? question 9 options: critical mass beta emission leptons gamma emission

critical mass

Explanation:

Fission reactions require a critical mass. The critical mass is the minimum amount of material required because it makes a fission reaction self sustaining. Nuclear fission additionally depends on the composition, purity and concentration of the fissile material and the geometry of the reactor. In the design of nuclear war head determining the critical mass is important.  

elements make up everything, and they combine to make compounds.

the answer is c

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.