8 G is a colourless crystalline solid which reacts with dilute nitric acid to give a colourless solution, H, and a colourless,
odourless gas, I, ewhich turns lime water milky. G has a lilac
flame colour.
a) identify G, H and I. b) write an equation (full or ionic) for the reaction between G and dilute nitric acid

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The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.

Ihonestly don’t know how to use that one