Worksheet for Chapter 9 PSC1515
1. Identify the following elements as monoatomic (m) or diatomic (d):
a. nitrogen____________ b. carbon____________
c. potassium___________ d. fluorine______________
2. Identify the following elements as solids (s) , liquids (l) , or gases (g) at
room temperature:
a. sodium_______________ b. argon______________
b. bromine_______________ d. mercury______________
e. sulfur________________ e. fluorine______________
3. Identify whether the following are composed of atoms (A) , molecules (M),
or formula units (FU):
a. CaCl2 ____________ b. Cl2 __________ c. Fe____________
d. CO2 ____________ e. Na 2 SO4____________
4. What is the charge that each of the following elements acquires when it
forms ions?
a. Na____________ b. C ___________ c. I ______________
d. Ba____________ e. S ____________
5. How many valence electrons does each of the following elements have?
a. neon____________ b. phosphorous_____________
b. calcium__________ d. hydrogen__________ e. bromine________
6. What is the electronic configuration for each of the following elements?
a. Mg _____________ b. C_____________ c. Ar_____________
d. K______________
7. What is the formula for the compound formed from each of the following
pairs of elements?
a. K and O _______________ b. Al and S _____________
b. Mg and N _______________ d. Ca and Se ______________
8. What is the formula formed when the following element and/or polyatomic
ion combine?
a. lithium and sulfate__________
b. ammonium and phosphate_________
c. beryllium and carbonate_____________
d. Pb4+ and oxalate_____________
9. Name the following:
a. MgCO3 __________________
b. Ca (OH)2___________________
c. Ga (NO3)3 ____________________
d. (NH4)3N ____________________
e. K3P _________________
f. Cu2I ________________
g. Cl2O7_______________
h. NO _________________
10. Provide the formulas for the following:
a. iron (III) oxide _______________
b. sodium bromide_______________
c. cobalt (II) phosphate______________
d. aluminum carbide ________________
e. dinitrogen monoxide ________________
11. Which of the following are electrolytes (E) or nonelectrolytes (NE)?
a. solid ionic compounds ____________
b. covalent compounds dissolved in water _____________
c. ionic compounds dissolved in water _____________
d. solid covalent compounds _______________
e. metals ________________
12. Which of the following elements is more electronegative based on its
position in the periodic table? (Do not look at EN values for this)
a. F or Na __________
b. Cl or I ___________
c. C or N _____________
d. P or N _______________
13. Check the EN values for the elements in the following bonds and
whether the bond is polar covalent (PC), nonpolar covalent (NC), or ionic (I):
a. HBr__________ b. KBr _____________ c. NO _____________
e. O2 ______________ f. CH4 ___________
Answers:
1. d, m, m, d 2. s, g, l, l, s, g 3. FU, M, A, M, FU 4. +1, -4, -1, +2, -2
5. 8, 5, 2, 1, 7 6. 2-8-2, 2-4, 2-8-8, 2-8-8-1 7. K2O, Al2S3, Mg3N2, CaSe
8. Li2SO4, (NH4)3PO4, BeCO3, Pb(C2O4)2
9. magnesium carbonate, calcium hydroxide, gallium nitrate, ammonium nitride,
potassium phosphide, copper (II) iodide, dichlorine heptoxide, nitrogen
monoxide.
10. Fe2O3, NaBr, Ca3(PO4)2, Al4C3, N2O
11. NE, NE, E, NE, E
12. F, Cl, N, N 13. PC, I, PC, NC, NC