Question

state the first law of thermodynamics . list the sign convention used in the energy dealt by the law​

Answer 1

the total energy of system and the surrounding remains constant

it can be exchanged only

it is the special case of conservation of energy
sign conventions are different for chemistry and physics so it depends on the frame of reference
for now just learn that
physics emphasis on surrounding so everything coming in surrounding is +ve

and chemistry emphasis on system anything comes in system is +ve

Answer 2

the total energy of the system &the surrounding remains constant

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