Two substances, A and B, with the same melting point. How can you determine if they are the same without using any form of spectroscopy? Explain in detail.

Simply carry out the mixed melting point procedure

1 here grind the two substances mix them

2.take note of the melting point of the mixture this is P

3 also get the original product from a different source okay this is Q

4.so I the melting point of P = Q then they represent a similar compound

5. But if melting point of P is not equal to Q then one of the compounds is P is acting as an impurity so they are not the same

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!

if you need further assistance, let me know: )

~ trueboss72