Chemistry Assignment Guruh Worksheet

NI 2

ENGR 1540 Worksheet 14 Chapter 7

1. Select the smaller member of each of the following pairs.
a. N and N3-
b. Ba and Ba2+
c. Se and Se2-
d. Co2+ and Co3+

2. Arrange the members of each of the following sets of cations in order of increasing ionic radii.
a. K+, Ca2+, Ga3+
b. Ca2+, Be2+, Ba2+, Mg2+
c. Al3+, Sr2+, Rb+, K+
d. K+, Ca2+, Rb+

3. Draw the Lewis dot symbol for each of the following atoms.
a. boron
b. fluorine
c. selenium
d. indium

4. How many electrons are shared between two atoms in
a. a single covalent bond
b. a double covalent bond
c. a triple covalent bond

5. Based on the positions in the periodic table of the following pairs of elements, predict whether bonding between the two would be primarily ionic or covalent. Justify your answers.
a. Ca and Cl
b. P and O
c. Br and I
d. Na and I
e. Si and Br
f. Ba and F

6. In each group of three bonds, which bond is likely to be the most polar?
a. C—H, O—H, S—H
b. C—Cl, Cl—Cl, H—Cl
c. F—F, O—F, C—F
d. N—H, N—O, N—Cl

7. Which one of the following contains both ionic and covalent bonds?
a. BaCO3
b. MgCl2
c. BaO
d. H2S
e. SO42-

8. Using only halogen atoms, what would be the most polar diatomic molecule that could be formed?

9. Suppose that you wanted to make a diatomic molecule using two different halogen atoms. What combination of halogens would be the least polar?

10. Draw the Lewis structure for each of the following molecules.
a. CO
b. H2S
c. SF6
d. NCl3