D because Carbon and Oxygen form covalent compounds. I wasn't the greatest at chem., but I'm pretty sure this is correct :D let me know if I gave you the right answer.
Answer is: S<span>AE standard that must be referred to on the label of approved HFC-134a refrigerant recycling machines are </span>J1770 and J2788.
<span>J1770 is to establish the specific minimum equipment requirements for recovery or recycling equipment intended for use with R134a.
</span>J2788 is intended to establish requirements for equipment used to recharge HFC-134a.<span />
C because neither the water or salt have changed their molecular structure. H2O is still H2O and NaCl is still NaCl.
