chemistry hw

homework #4 CHE 221 General Chemistry I Concordia University—Irvine Due: 2016 September 6 – 7 1. Classify each of the following elements as main-group or transition elements. Also, specify if

they are metals, metalloids, or non-metals: main group or transition

element metal, metalloid, or

non-metal a. Cr b. As c. N d. K e. S f. Bi

2. Write a short definition for each of the following: a. molecular compound b. ionic compound c. diatomic molecule d. molecular formula e. empirical formula 3. Using ONLY the periodic table, indicate the ion most likely to be formed by an atom of each of

the following: a. Cl b. B c. N d. Ca e. Na f. Se 4. Classify each of the following compounds as molecular or ionic: a. N2Cl4 b. KBr c. BaCl2 d. sulfur difluoride e. iron(III) oxide f. triphosphorus hexabromide 5. Write the names of the following formulas: a. RbCl c. Mn(OH)2 b. K2Se d. Mg(MnO4)2

6. Write the names of the following formulas: a. N3O7 c. CCl4 b. Cl2O5 d. SF6 7. Write the formulas for the following compounds: a. potassium oxide c. nickel(III) hypochlorite b. calcium nitrite d. molybdenum(IV) cyanide 8. Write formulas for the following compounds: a. diphosphorus tetrachloride c. selenium trisulfide b. iodine pentafluoride d. arsenic heptachloride 9. Name or give the formula of the following acids: a. chlorous acid c. HNO2 b. hypobromous acid d. HF