When would it be most appropriate to use ppm to describe the concentration of the solutes in a solution?

select all that apply.

a) when listing ingredients on food packaging.

b) when describing very dilute solutions.

c) when describing environmental contaminants.

d) when describing solutions in which the solute is a solid.

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.

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warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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the answer is d.) potassium