Which statement is usually true about the relationship between activation energy and reaction rates?
Low activation energy barriers result in low rates.
High activation energy barriers result in low rates.
Low activation energy barriers result in no reaction.
High activation energy barriers result in no reaction.

you gotta add the following molecules so we can give u an answer

explanation:

it is the minimum amount of material needed to sustain a fission reaction.

critical mass is the minimum amount of fissionable material that must be assembled for a sustained fission reaction to take place. although two to three neutrons are produced for every fission, not all of these neutrons are available for continuing the fission reaction. if the conditions are such that the neutrons are lost at a faster rate than they are formed by fission, the chain reaction will not be self-sustaining.   at the point where the chain reaction can become self-sustaining, this is referred to as critical mass.