7.) Indicate the type of crystalline solid of NiAu Ionic
Molecular
Covalent Network
Metallic
8.) Indicate the type of crystalline solid of graphite carbon
Ionic
Molecular
Covalent Network
Metallic
9.) Indicate the type of crystalline solid of CO₂
Ionic
Molecular
Covalent Network
Metallic

a graduated cylinder.

explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

it's all four options.