$1$: In simple words what does an open, closed,adiabatic, isothermal system$/$process mean $?$

$2$:write the general equation of energy balance $?$

$3$:simplify the general equation of energy balances for an open, closed,adiabatic system$/$process $,$ show the simplification steps $?$

$4$: Distinguish between complete and incomplete combustion $?$

$5$:because of me $,$ the temperature stays during the phase change, what am I?