Which of the following statements regarding the mplications of the 1st and 2nd law of thermodynamics s correct? o the 1st law predicts the direction and amount of energy flow. heat and work added to or taken away from a system constitute a change in entropy. o the total amount of energy in the universe is changing ospontaneous direction of energy flow is always toward a state of maximal total entropy. none of the above are correct.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

c (diamond),

sio2 (quartz)

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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