CHM 1033 Class Assignment #3 Module 3 Name Answers________

1. Draw Lewis Dot Structures for the following elements and ions.

a. S b. Mg c. P d. O^-2 e. Al⁺³ f. Cl^-

2. Classify each of the following compounds as covalent or ionic.

a. K₂O ionic _ b. CCl₄ __covalent_____ c. BaCl₂ __ionic_____ d. SO₂ _covalent_

3. Write formulas for the compounds formed between the following elements.

a. Li & O _Li₂O___ b. Al & Cl _AlCl₃__ c. Ca & N _Ca₃N₂__ d. Mg & S _MgS____

4. Draw Lewis structures (electron dot formulas) for the following compounds.

a. PCl₃

b. SiH₄

c. N₂

d. OF₂

e.SO₃

5. Write names for the following compounds.

a. (NH₄)₂SO₄ _ammonium sulfate________ b. Al(HCO₃)₃ aluminum hydrogen carbonate

c. MgCl₂ __magnesium chloride________ d. CO₂ __carbon dioxide____________

e. Na₃PO₄ __sodium phosphate_______ f. K₃N _potassium nitride____________

g. Cl₂O₅ ___dichlorine pentoxide________ h. Ca(NO₃)₂ _calcium nitrate_________

6. Write formulas for the following compounds.

a. beryllium cyanide _Be(CN)₂__ b. nitrogen trifluoride _NF₃_____

c. barium phosphide _Ba₃P₂____ d. calcium bicarbonate _Ca(HCO₃)₂

e. lithium sulfide _Li₂S_____ f. ammonium carbonate _(NH₄)₂CO₃

g. strontium hydroxide _Sr(OH)₂__ h. sulfur hexafluoride _SF₆_____

7. For each of the following pairs of elements, underline the one which is the most electronegative.

a. K & Cl b. Ca & Mg c. S & Cl d. O & F e. Sb & Br f. H & F

8. Circle the bond which is the most polar.

H-S H-Se H-O H-Te

CHM 1033 Class Assignment #3 Module 3 Name __Answers__________