write the names for the following covalent compounds:
9) p4s5
10) o2
11) sef6
12) si2br6
13) scl4
14) ch4
15) b2si
16) nf3

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# Brief Explanations:
- For covalent compounds, the naming rules involve using prefixes (mono-, di-, tri-, etc.) to indicate the number of each type of atom.
- For $P_4S_5$: "P" is phosphorus, "S" is sulfur. The prefix "tetra -" for 4 (from $P_4$) and "penta -" for 5 (from $S_5$). So it's tetraphosphorus pentasulfide.
- For $O_2$: It's a diatomic molecule of oxygen. The name is oxygen (since for elements like $O_2$, $N_2$ etc., when they are in their elemental diatomic form, we just use the element name).
- For $SeF_6$: "Se" is selenium, "F" is fluorine. Prefix "hexa -" for 6 (from $F_6$). So it's selenium hexafluoride.
- For $Si_2Br_6$: "Si" is silicon, "Br" is bromine. Prefix "di -" for 2 (from $Si_2$) and "hexa -" for 6 (from $Br_6$). So it's disilicon hexabromide.
- For $SCl_4$: "S" is sulfur, "Cl" is chlorine. Prefix "tetra -" for 4 (from $Cl_4$). So it's sulfur tetrachloride.
- For $CH_4$: "C" is carbon, "H" is hydrogen. Prefix "tetra -" for 4 (from $H_4$). It's also commonly known as methane (a common name in organic chemistry, but following covalent naming rules it's carbon tetrahydride).
- For $B_2Si$: "B" is boron, "Si" is silicon. Prefix "di -" for 2 (from $B_2$). So it's diboron silicide.
- For $NF_3$: "N" is nitrogen, "F" is fluorine. Prefix "tri -" for 3 (from $F_3$). So it's nitrogen trifluoride.

# Answer:
9) Tetraphosphorus pentasulfide
10) Oxygen
11) Selenium hexafluoride
12) Disilicon hexabromide
13) Sulfur tetrachloride
14) Carbon tetrahydride (or Methane)
15) Diboron silicide
16) Nitrogen trifluoride

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