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Constructed Responses . Topic 4: Chemical bonding

Set A: Type of bonding, Lewis electron-dot diagram

Base your answers to questions 1 and 2 on the balanced equation below.

2Na(s) + Cl2(g) ----- > 2NaCl(s)

Write your answers here.

1. Explain, in terms of electrons, why the bonding 1.

in NaCl is ionic.

2. Draw the Lewis electron-dot diagram for a molecule 2.

of chlorine, Cl2.

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Set B: Bond and molecular polarity, bond description, intermolecular forces

Base your answers to questions 3 through 6 on the information below.

Each molecule listed below is formed by the sharing of electrons between
atoms when atoms within the molecule are bonded together.
Molecule A: Cl2
Molecule B: CCl4
Molecule C: NH3

Write your answers here.
3. Explain how the bonding in KCl is different 3.

from the bonding in molecules A, B, and C.
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4. Explain why NH3 has stronger forces of 4.

attraction than Cl2.

5. Explain why CCl4 is classified as a nonpolar 5.

molecule.

6. Draw the Lewis electron-dot structures for 6.

the NH3 molecule.

Set C: Molecular polarity, properties of substances, Lewis electron-dot diagram

Base your answers to questions 7 through 8 on the information below.

When hydrogen bromide, a gas, is dissolved in water, the solution is
called hydrobromic acid.
Write your answers here.
7. Is hy drogen bromide a polar or nonpolar molecule? 7.
Expl ain your answer?

8. Draw the Lewis electron-dot diagram for hydrogen 8.

bromide.

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