Question

1. write formulas for the following ionic and molecular compounds:

a. dihydrogen monoxide
b. aluminum sulfide
c. sodium hydroxide
d. iodine tribromide
e. diarsenic pentachloride
f. carbon monoxide
g. copper (ii) chloride
h. dicarbon hexafluoride
i. silicon tetrachloride
j. calcium sulfate

Explanation:

Part a: Dihydrogen monoxide

Step1: Identify elements and prefixes.

Dihydrogen means 2 H atoms, monoxide means 1 O atom.

Step2: Combine atoms.

Formula: $H_2O$

Part b: Aluminum sulfide

Step1: Determine oxidation states.

Aluminum (Al) has +3, sulfide (S) has -2.

Step2: Balance charges.

To balance, need 2 Al and 3 S. Formula: $Al_2S_3$

Part c: Sodium hydroxide

Step1: Identify ions.

Sodium (Na⁺), hydroxide (OH⁻).

Step2: Combine ions.

1 Na⁺ and 1 OH⁻. Formula: $NaOH$

Part d: Iodine tribromide

Answer:

a. $H_2O$
b. $Al_2S_3$
c. $NaOH$
d. $IBr_3$
e. $As_2Cl_5$
f. $CO$
g. $CuCl_2$
h. $C_2F_6$
i. $SiCl_4$
j. $CaSO_4$