The internal energy of a system is always increased by Select one: a adding heat

Question

The internal energy of a system is always increased by Select one: a adding heat to the system. O b. a volume compression. c. withdrawing heat from the system O d adding heat to the system and having the system do work on the surroundings. e having the system do work on the surroundings How many soules are required to raise the temperature of a 350 g sample of iron from 25 c to 35 c2 Iron has a specific heat of 0.449 Jig C 2:00 Select one stion o a 155 J O b. 4.60 J c. 15.5J d. 389 J e 544 J 1022 PM 2/2/2017

Explanation / Answer

Na , Mg ,Al -------------> second period

K , Ca -------------> third period

in the period from left to right metallic character decreases and non-metallic character increases

in a group from top to bottom metallic character increases and non-metallic character decreases

based these two statements

same groups elements Na and K are compititive.

K is most metallic than Na

so answer is potassium

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