In gas/vapor removing respirators, are used to interact with the gas or vapor molecule to clean the air.

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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~ trueboss72

the dissolution of polymer can be thermodynamically described in 2 steps.

the correct answer would be b) volume versus temperature, because they are also directly proportional.