For ΔEsys to always be -, what must be TRUE? Group of answer choices
A) q = w
B) +q > -w
C) +w > -q
D) -w > +q

D. -w > +q must be true in order to make the ΔE negative.

Explanation:

As we cannot find the internal energy as such, we can find the change in internal energy, that was accompanied by the change in the system.

The change in internal energy of the system can be found by means of transfer of work or heat out of a system or into the system and it is given by the equation,

ΔE = q + w

For ΔE must be negative,

If q = w then ΔE = 0

If +q > -w then ΔE = + ve

If +w > - q then ΔE = +ve

If -w > +q then ΔE = -ve

So option D is the answer.

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explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.