Question

1. choose the best answer.

what is the formula for the covalent compound chlorine dioxide?
clo₃
cl₂o₂
co₂
clo₂

1. choose the best answer.

what is the formula for the covalent compound hydrogen iodide?
hi₂
hi
h₂i
h₂i₂

Explanation:

Question 9

For covalent compounds, the prefixes indicate the number of atoms. "Chlorine dioxide" has "chlorine" (Cl) and "dioxide" means two oxygen (O) atoms. So the formula should be $ClO_2$.

Hydrogen iodide consists of one hydrogen (H) atom and one iodine (I) atom (since there are no prefixes indicating multiple atoms, so the formula is HI).

Answer:

D. $ClO_2$

Question 10