Which statement accurately describes the interaction between the poles of two bar magnets

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.

Explain the difference in reactivity of the elements based on their electron configurations.